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Tait T860 Series II Service Manual

Manual is about: 220-285MHz

Summary of T860 Series II

  • Page 1

    M860-00-preliminary 1 copyright tel 30/06/98 t860 series ii base station equipment 220-285mhz preliminary service manual july 1998 m860-00-prelim.

  • Page 2: T800

    2 m860-00-preliminary 30/06/98 copyright tel t800 t800 head office new zealand tait electronics ltd 558 wairakei road p.O. Box 1645 christchurch new zealand phone: 64 3 358-3399 fax: 64 3 358-3636 radio systems division 535 wairakei road p.O. Box 1645 christchurch new zealand phone: 64 3 358-3399 fa...

  • Page 3: About This Manual

    M860-00-preliminary 3 copyright tel 30/06/98 about this manual scope this manual contains general, technical and servicing informa- tion on t860 series ii 100w base stations which comprise the fol- lowing equipment: copyright all information contained in this manual is the property of tait electroni...

  • Page 4: Table of Contents

    4 m860-00-preliminary 30/06/98 copyright tel table of contents this manual is divided into six parts as listed below, with each part being further sub- divided into sections. There is a detailed table of contents at the start of each part and/ or section. Part title a introduction to servicing b t86...

  • Page 5: Part A

    M860-00-preliminary ai copyright tel 30/06/98 part a introduction to servicing this part of the manual is divided into the sections listed below. These sections provide some general and advisory information on servicing procedures, and a brief history of pgm800win programming software. Section title...

  • Page 6

    Aii m860-00-preliminary 30/06/98 copyright tel.

  • Page 7: General

    M860-00-preliminary general a1.1 copyright tel 30/06/98 1 general 1.1 additional technical information if you have any questions about this manual or the equipment it describes, please con- tact your nearest tait dealer or subsidiary. If necessary, you can get additional technical help from the cust...

  • Page 8: 1.3

    A1.2 general m860-00-preliminary 30/06/98 copyright tel figure 1.2 typical anti-static bench set-up 1.3 caution: aerial load the equipment has been designed to operate safely under a wide range of aerial loading conditions. However, we strongly recommend that the transmitter should always be operate...

  • Page 9: Mechanical

    M860-00-preliminary mechanical a2.1 copyright tel 30/06/98 2 mechanical 2.1 torx recess head screws torx recess head screws are becoming the standard screw head type in all t800 series ii equipment, with pozidriv and philips recess head screws being used in fewer applica- tions. The torx recess head...

  • Page 10: 2.2

    A2.2 mechanical m860-00-preliminary 30/06/98 copyright tel 2.2 pozidriv & philips recess head screws pozidriv and philips recess head screws will continue to be used in t800 series ii equip- ment in a few special applications. It is important that you use the correct type and size screwdriver for ea...

  • Page 11: 2.3

    M860-00-preliminary mechanical a2.3 copyright tel 30/06/98 2.3 disassembly/reassembly 2.3.1 receivers/exciters to carry out alignment or change option links, you need to remove only the top cover, i.E. The one adjacent to the front panel handle and on the opposite side to the main d-range connector ...

  • Page 12

    A2.4 mechanical m860-00-preliminary 30/06/98 copyright tel.

  • Page 13: Component Replacement

    M860-00-preliminary component replacement a3.1 copyright tel 30/06/98 3 component replacement 3.1 leaded components whenever you are doing any work on the pcb that involves removing or fitting compo- nents, you must take care not to damage the copper tracks. The two satisfactory meth- ods of removin...

  • Page 14: 3.2

    A3.2 component replacement m860-00-preliminary 30/06/98 copyright tel 3.2 surface mount devices caution: surface mount devices (smds) require special storage, handling, removal and replacement techniques. This equipment should be serv- iced only by an approved tait dealer or subsidiary equipped with...

  • Page 15: Software History

    M860-00-preliminary software history a4.1 copyright tel 30/06/98 4 software history 28/06/96 pgm800win version 1.0 18/08/97 pgm800win version 2.00 4.1 pgm800win v1.0 pgm800win v1.0 is different in concept from dos versions of pgm800 in that it is win- dows 1 based. It also includes many new and impr...

  • Page 16

    A4.2 software history m860-00-preliminary 30/06/98 copyright tel • extra information that is not stored in the radio (but which is still relevant to the radio) can be saved to a file on disk (e.G. Note field, auxiliary pin names, etc.). Note: the data files produced by baseprog v1.0, all dos version...

  • Page 17: Part B

    M860-00-preliminary bi copyright tel 30/06/98 part b t865 receiver this part of the manual is divided into six sections, as listed below. There is a detailed table of contents at the start of each section. Section title 1 general information 2 circuit operation 3 initial tuning & adjustment 4 functi...

  • Page 18

    Bii m860-00-preliminary 30/06/98 copyright tel.

  • Page 19: T865 General Information

    M860-00-preliminary t865 general information b1.1 copyright tel 30/06/98 1 t865 general information this section provides a brief description of the t865 receiver, along with detailed speci- fications and a list of types available. The following topics are covered in this section. Section title page...

  • Page 20

    B1.2 t865 general information m860-00-preliminary 30/06/98 copyright tel.

  • Page 21: 1.1

    M860-00-preliminary t865 general information b1.3 copyright tel 30/06/98 1.1 introduction the t865 is a high performance microprocessor controlled fm base station receiver designed for single or multichannel operation in the 220 to 270mhz frequency range. The receiver is a dual conversion superhet w...

  • Page 22: 1.2

    B1.4 t865 general information m860-00-preliminary 30/06/98 copyright tel 1.2 specifications 1.2.1 introduction the performance figures given are minimum figures, unless otherwise indicated, for equipment tuned with the maximum switching range and operating at standard room temperature (+22 ° c to +2...

  • Page 23: 1.2.3

    M860-00-preliminary t865 general information b1.5 copyright tel 30/06/98 dimensions: height .. 191mm width .. 60mm length .. 324mm weight .. 2.13kg 1.2.3 rf section frequency range .. 220-270mhz type .. Dual conversion superheterodyne frequency increment .. 5 or 6.25khz switching range .. 4mhz (i.E....

  • Page 24: 1.2.4

    B1.6 t865 general information m860-00-preliminary 30/06/98 copyright tel selectivity: narrow bandwidth (±12.5khz) .. 85db minimum, 89db typical mid bandwidth (±20khz) .. 87db minimum, 90db typical wide bandwidth (±25khz) .. 90db minimum, 95db typical offset selectivity (canada only) .. 20db spurious...

  • Page 25

    M860-00-preliminary t865 general information b1.7 copyright tel 30/06/98 line output: power .. Adjustable to >+10dbm load impedance .. 600 ohms distortion (@ -70dbm signal level): de-emphasised flat wide bandwidth .. ≤ 2% ≤ 2% mid & narrow bandwidth .. ≤ 2% ≤ 4% monitor output: power .. 1w speaker i...

  • Page 26: 1.2.5

    B1.8 t865 general information m860-00-preliminary 30/06/98 copyright tel carrier mute (optional): operating range .. -115 to -80dbm hysteresis .. 2 to 10db opening time .. 5ms closing time .. 50ms note: the opening and closing times given above are for the standard set-up (sl210 linked and sl220 not...

  • Page 27

    M860-00-preliminary t865 general information b1.9 copyright tel 30/06/98 1.2.6.2 dti cept recommendation t/r-24-01 annex i: 1988 technical characteristics and test conditions for radio equipment in the land mobile service intended primarily for analogue speech. Annex ii: 1988 technical characteristi...

  • Page 28: 1.3

    B1.10 t865 general information m860-00-preliminary 30/06/98 copyright tel 1.3 product codes the three groups of digits in the t860 series ii product code provide information about the model, type and options fitted, according to the conventions described below. The following explanation of t860 seri...

  • Page 29: 1.4

    M860-00-preliminary t865 general information b1.11 copyright tel 30/06/98 1.4 standard product range the following table lists the range of standard t865 types (i.E. No options fitted) availa- ble at the time this manual was published. Consult your nearest tait dealer or subsidi- ary for more inform...

  • Page 30

    B1.12 t865 general information m860-00-preliminary 30/06/98 copyright tel.

  • Page 31: T865 Circuit Operation

    M860-00-preliminary t865 circuit operation b2.1 copyright tel 30/06/98 2 t865 circuit operation this section provides a basic description of the circuit operation of the t865 receiver. Note: unless otherwise specified, the term "pgm800win" used in this and follow- ing sections refers to version 2.00...

  • Page 32

    B2.2 t865 circuit operation m860-00-preliminary 30/06/98 copyright tel.

  • Page 33: 2.1

    M860-00-preliminary t865 circuit operation b2.3 copyright tel 30/06/98 2.1 introduction figure 2.1 t865 high level block diagram the t865 receiver consists of a number of distinct stages: • front end • mixer • synthesised local oscillator • if • audio processor • mute (squelch) • regulator circuits ...

  • Page 34: 2.2

    B2.4 t865 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.2 receiver front end (refer to the front end, if section and audio processor circuit diagrams (sheets 4, 3 and 2 respectively) in section 6.) figure 2.2 t865 front end, if and mute block diagram the incoming signal from the n-t...

  • Page 35: 2.3

    M860-00-preliminary t865 circuit operation b2.5 copyright tel 30/06/98 2.3 mixer (refer to the front end circuit diagram (sheet 4) in section 6 and figure 2.2.) ic420 is a high level mixer requiring a local oscillator (lo) drive level of +17dbm (nom- inal). The voltage controlled oscillator (vco) ge...

  • Page 36: 2.5

    B2.6 t865 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.5 noise mute (squelch) (refer to the audio processor and if section circuit diagrams (sheets 2 and 3 respec- tively) in section 6 and figure 2.2.) the noise mute operates on the detected noise outside the audio bandwidth. An op...

  • Page 37: 2.7

    M860-00-preliminary t865 circuit operation b2.7 copyright tel 30/06/98 2.7 audio processor (refer to the audio processor circuit diagram (sheet 2) in section 6.) figure 2.3 t865 audio processor block diagram the recovered audio on pin 7 of ic350 is processed by ic390 and passed through a fre- quency...

  • Page 38: 2.8

    B2.8 t865 circuit operation m860-00-preliminary 30/06/98 copyright tel the audio can also be disabled using the "rx-disable" inputs, pads 225 or 228, having connected the "rx-disable" link between pins 1 & 2 of pl260. An adjustable time delay (rv220) is provided on these lines. In order to disable t...

  • Page 39: 2.9

    M860-00-preliminary t865 circuit operation b2.9 copyright tel 30/06/98 2.9 microcontroller (refer to the microcontroller circuit diagram (sheet 8) in section 6.) figure 2.5 t865 microcontroller block diagram overall system control of the t865 is accomplished by the use of a member of the 80c51 famil...

  • Page 40: 2.10

    B2.10 t865 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.10 synthesised local oscillator (refer to the synthesiser circuit diagram (sheet 7) in section 6 and the vco circuit dia- gram in part e.) figure 2.6 t865 synthesiser block diagram the synthesiser (ic740) employs a phase-locke...

  • Page 41: 2.11

    M860-00-preliminary t865 circuit operation b2.11 copyright tel 30/06/98 2.11 vco (refer to the vco circuit diagram in part e.) the vco transistor (q1) operates in a common source configuration, with an lc tank circuit coupled between its gate and drain to provide the feedback necessary for oscilla- ...

  • Page 42

    B2.12 t865 circuit operation m860-00-preliminary 30/06/98 copyright tel.

  • Page 43

    M860-00-preliminary t865 initial tuning & adjustment b3.1 copyright tel 30/06/98 3 t865 initial tuning & adjustment the following section describes both short and full tuning and adjustment procedures and provides information on: • channel programming • selecting the required audio links • synthesis...

  • Page 44

    B3.2 t865 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.9 noise mute adjustment 3.12 3.10 carrier level mute 3.12 3.11 3.11.1 3.11.2 audio processor line amplifier output monitor amplifier output (speaker output) 3.13 3.13 3.13 3.12 rssi 3.13 figure title page 3.1 3.2 t865...

  • Page 45: 3.1

    M860-00-preliminary t865 initial tuning & adjustment b3.3 copyright tel 30/06/98 3.1 introduction when you receive your t865 receiver it will be run up and working on a particular fre- quency (the "default channel") 1 . If you want to switch to a frequency that is within the 4mhz switching range (i....

  • Page 46: 3.3

    B3.4 t865 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.3 test equipment required you will need the following test equipment: • computer with pgm800win installed • t800 programming kit • module programming interface (e.G. T800-01-0004 - optional) • 13.8v power supply • dig...

  • Page 47: 3.4

    M860-00-preliminary t865 initial tuning & adjustment b3.5 copyright tel 30/06/98 3.4 short tuning procedure use this procedure only if you want to reprogram the receiver to a frequency outside the 4mhz switching range and do not intend to carry out any other major adjustments or repairs. 3.4.1 intro...

  • Page 48: 3.4.4

    B3.6 t865 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel continually decrease the rf level to maintain 12db sinad. Readjust l410, l420, l460 & l470 to give best sinad. With pl210 and pl220 connected for de-emphasised audio response, the receiver sensitivity should be better t...

  • Page 49: 3.4.6

    M860-00-preliminary t865 initial tuning & adjustment b3.7 copyright tel 30/06/98 3.4.6 rssi (if used) align the receiver as instructed in section 3.6 and section 3.7. Apply an on-channel signal from the rf generator at a level of -100dbm with 3khz deviation (2.4khz) [1.5khz] at 1khz. Adjust rv320 (r...

  • Page 50: 3.5

    B3.8 t865 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.5 audio processor links 3.5.1 general use the following table to set up the audio processor to the configuration you require. You should set the audio processor links before carrying out the receiver alignment. The fa...

  • Page 51: 3.5.2

    M860-00-preliminary t865 initial tuning & adjustment b3.9 copyright tel 30/06/98 3.5.2 audio processor linking details for ctcss you must connect the audio processor links correctly according to the ctcss option used, as shown in the table below. The conditions stated in the above table are defined ...

  • Page 52: 3.6

    B3.10 t865 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.6 synthesiser alignment • ensure that the receiver has been programmed with the required frequencies using pgm800win software. • connect a high impedance voltmeter to pl4-1 or the junction of l1 & r1 in the vco (this...

  • Page 53

    M860-00-preliminary t865 initial tuning & adjustment b3.11 copyright tel 30/06/98 note: if a second oscillator is not available, you can connect a frequency counter to ic710 pin 8 (i.E. After the tcxo buffer) via an oscilloscope probe to measure the tcxo frequency directly (12.8mhz). At this point t...

  • Page 54: 3.8

    B3.12 t865 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.8 gating delay two solder links (sl210 & sl220) are provided on the bottom of the pcb to allow three gate delay time options, as shown in the table below. *factory setting. 3.9 noise mute adjustment connect pins 1 & ...

  • Page 55: 3.11

    M860-00-preliminary t865 initial tuning & adjustment b3.13 copyright tel 30/06/98 3.11 audio processor 3.11.1 line amplifier output apply an on-channel signal from the rf generator at a level of -70dbm with 3khz deviation (2.4khz) [1.5khz] at 1khz. Adjust rv210 (front panel line level) to give an ou...

  • Page 56

    B3.14 t865 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel.

  • Page 57: T865 Functional Testing

    M860-00-preliminary t865 functional testing b4.1 copyright tel 30/06/98 4 t865 functional testing the following test procedures will confirm that the t865 has been tuned and adjusted correctly and is fully operational. Note 1: in this and following sections deviation settings are given first for wid...

  • Page 58

    B4.2 t865 functional testing m860-00-preliminary 30/06/98 copyright tel.

  • Page 59: 4.1

    M860-00-preliminary t865 functional testing b4.3 copyright tel 30/06/98 4.1 current consumption connect the t865 to a 13.8v power supply. Rotate rv230 (front panel gating sensitivity) anticlockwise until the "gate" led is extinguished. Set switch sw201 (front panel monitor mute) to the on position. ...

  • Page 60: 4.4

    B4.4 t865 functional testing m860-00-preliminary 30/06/98 copyright tel 4.4 audio distortion the level of distortion measured at the line output (refer to figure 1.3 in part f) gives an indication of the accuracy of the if alignment. Apply an accurate on-channel signal from the rf generator at a lev...

  • Page 61: 4.6

    M860-00-preliminary t865 functional testing b4.5 copyright tel 30/06/98 4.6 de-emphasised audio frequency response set rv210 (front panel line level) to provide 0dbm output at 1khz modulating fre- quency. Sweep the modulating frequency, checking that the line audio response closely follows that show...

  • Page 62: 4.7

    B4.6 t865 functional testing m860-00-preliminary 30/06/98 copyright tel 4.7 noise mute (if linked in) rotate rv230 (front panel gating sensitivity) fully anticlockwise. Apply an on-channel signal from the rf generator at a level of -110dbm with 3khz deviation (2.4khz) [1.5khz] at 1khz. Increase the ...

  • Page 63: 4.9

    M860-00-preliminary t865 functional testing b4.7 copyright tel 30/06/98 4.9 carrier level mute (carrier mute linked in) apply an on-channel signal from the rf generator at a level of -120dbm with 3khz deviation (2.4khz) [1.5khz] at 1khz. Increase the rf level in 2db steps and check that the mute ope...

  • Page 64: 4.10.3

    B4.8 t865 functional testing m860-00-preliminary 30/06/98 copyright tel 4.10.3 high pass filter set the audio processor links as follows: reset the rf signal generator output to -70dbm and note the line level (measure- ment a). Reduce the 1khz generator to zero output and measure the line level agai...

  • Page 65: T865 Fault Finding

    M860-00-preliminary t865 fault finding b5.1 copyright tel 30/06/98 5 t865 fault finding the following test procedures and fault finding flow charts may be used to help locate a hardware problem, however they are by no means a complete fault finding procedure. If you still cannot trace the fault afte...

  • Page 66

    B5.2 t865 fault finding m860-00-preliminary 30/06/98 copyright tel 5.7 5.7.1 5.7.1.1 5.7.1.2 5.7.1.3 5.7.2 5.7.3 5.7.4 5.7.5 5.7.6 5.7.7 fault finding charts microcontroller basic checks serial communication ctcss decode regulator synthesiser noise mute carrier mute receiver audio 5.9 5.9 5.9 5.10 5...

  • Page 67: 5.1

    M860-00-preliminary t865 fault finding b5.3 copyright tel 30/06/98 5.1 visual checks remove the covers from the t865 and inspect the pcb for damaged or broken compo- nents, paying particular attention to the surface mounted devices (smds). Check for defective solder joints. If repair or replacement ...

  • Page 68: 5.4

    B5.4 t865 fault finding m860-00-preliminary 30/06/98 copyright tel 5.4 dc checks 5.4.1 power rails refer to the test points & options diagrams in section 6 for test point locations, and to the regulator fault finding chart (section 5.7.2) for fault diagnosis. Check the 9v (tp602) and 13.8v (tp601) p...

  • Page 69: 5.5

    M860-00-preliminary t865 fault finding b5.5 copyright tel 30/06/98 5.5 rf checks 5.5.1 vco frequency check that the vco is phase locked (refer to section 5.4.2). Connect a frequency counter (level +19dbm) to the vco input to the mixer (ic420). Monitor the local oscillator frequency and check that it...

  • Page 70: 5.5.3

    B5.6 t865 fault finding m860-00-preliminary 30/06/98 copyright tel note: poor sensitivity into the mixer can be caused by lack of drive level from the vco (the drive level should be >+17dbm). Refer to the receiver fault finding charts (section 5.7.6) for further information. 5.5.3 oscillator stabili...

  • Page 71: 5.5.5

    M860-00-preliminary t865 fault finding b5.7 copyright tel 30/06/98 5.5.5 if distortion if the audio distortion is still high after careful if alignment (section 3.7), sweep the if to investigate the bandpass response. Apply an on channel rf signal modulated at 10hz with approximately 12khz (9khz) [6...

  • Page 72: 5.6

    B5.8 t865 fault finding m860-00-preliminary 30/06/98 copyright tel 5.6 pgm800win generated errors the following errors are those most likely to occur using pgm800win. Refer to the pgm800win software user’s manual for a complete list of error messages. Channel switch set the programmed default channe...

  • Page 73: 5.7

    M860-00-preliminary t865 fault finding b5.9 copyright tel 30/06/98 5.7 fault finding charts note: the standard test point designations used in this section are as follows: tp601 13.8v tp602 9v tp603 20v tp604 5v 5.7.1 microcontroller (ic810) 5.7.1.1 basic checks pulsing check state of pin 35. Y is p...

  • Page 74

    B5.10 t865 fault finding m860-00-preliminary 30/06/98 copyright tel 5.7.1.2 serial communication check pin state. Y low/floating n noise on pin disconnect the programming lead. Is ic810 pin 11 high? (microcontroller) y *digital storage oscilloscope use pgm800win to send a poll command to the radio. ...

  • Page 75

    M860-00-preliminary t865 fault finding b5.11 copyright tel 30/06/98 5.7.1.3 ctcss decode y no square wave or uneven mark/space ratio use pgm800win to select a channel with a ctcss tone programmed. Check serial communications. (see separate flow chart). Cannot select a channel check ic810 pins 24 & 2...

  • Page 76: 5.7.2

    B5.12 t865 fault finding m860-00-preliminary 30/06/98 copyright tel 5.7.2 regulator check for overheating components & short circuits. 13.8v present on ic630 pin 3? 5.3v present on ic630 pin 1? 9.0v present on tp202? Check q620, q630 & ic640. 20v present on tp701? Check q660 is switching at approx. ...

  • Page 77: 5.7.3

    M860-00-preliminary t865 fault finding b5.13 copyright tel 30/06/98 5.7.3 synthesiser refer to the synthesiser circuit diagram (sheet 7) in section 6 and the vco circuit dia- gram in part e. N check biasing resistors, q4 & q5. Check 9v reg. N y n 8.3v present at vco? Dc v present at q4 & q5? 9v pres...

  • Page 78

    B5.14 t865 fault finding m860-00-preliminary 30/06/98 copyright tel programming and serial bus ok? Is reference clock present at ic740 pin 20 (12.8mhz >1.5vpp)? Check programming. Check serial bus when programming i.E. Clock/data/enable activity (ic740 pins 18, 19 & 17). N n check loop filter compon...

  • Page 79

    M860-00-preliminary t865 fault finding b5.15 copyright tel 30/06/98 y n y y y y n y y y c noisy synth; poor selectivity &/or poor residual fm. Correct dc v present on q1 vco? Change trimmer; still noisy? Change q1; still noisy? Change tcxo; still noisy? Change varactors; still noisy? Replace vco ass...

  • Page 80: 5.7.4

    B5.16 t865 fault finding m860-00-preliminary 30/06/98 copyright tel 5.7.4 noise mute apply on channel signal @ -117dbm* to receiver. Refer to audio fault finding chart. Ensure pl250 is set for noise mute operation. Audio on ic350 pin 7? Noise on ic390 pin 7? Amplified noise on c395? Check q340 & q35...

  • Page 81: 5.7.5

    M860-00-preliminary t865 fault finding b5.17 copyright tel 30/06/98 5.7.5 carrier mute approx. 5v on rssi pad 238? Approx. 5v on ic280 pin 1? Check ic390 and adjoining components. Check/replace ic280 & adjoining components. Check q230, q245 & q290 for operation. Adjust rv235 & observe voltage on ic2...

  • Page 82: 5.7.6

    B5.18 t865 fault finding m860-00-preliminary 30/06/98 copyright tel 5.7.6 receiver refer to the receiver if and front end circuit diagrams (sheets 3 & 4) in section 6. High audio distortion. B note: t.B. = test break (refer circuit diagrams) quad coil l360 tuned for min. Distortion (flat audio respo...

  • Page 83: 5.7.7

    M860-00-preliminary t865 fault finding b5.19 copyright tel 30/06/98 5.7.7 audio audio on ic350 pin 7? Audio on ic210 pin 1? Check components around ic210. Apply on channel signal @ -117dbm* to receiver. Refer to receiver fault finding chart. Ensure rv230 (gating sensitivity) fully clockwise. "gate" ...

  • Page 84

    B5.20 t865 fault finding m860-00-preliminary 30/06/98 copyright tel.

  • Page 85: T865 Pcb Information

    M860-00-preliminary t865 pcb information b6.1 copyright tel 30/06/98 6 t865 pcb information this section provides the following information on the t865 receiver: • parts lists • grid reference index • pcb layouts • test points & options connections drawings • circuit diagrams.

  • Page 86

    B6.2 t865 pcb information m860-00-preliminary 30/06/98 copyright tel.

  • Page 87: 6.1

    M860-00-preliminary t865 pcb information b6.3 copyright tel 30/06/98 6.1 introduction product type identification you can identify the receiver type by checking the product code printed on a label on the rear of the chassis (product codes are explained in section 1.3 in this part of the manual, and ...

  • Page 88: Parts Lists

    B6.4 t865 pcb information m860-00-preliminary 30/06/98 copyright tel parts lists the 10 digit numbers (000-00000-00) in this parts list are “internal part numbers” (ipns). We can process your spare parts orders more efficiently and accurately if you quote the ipn and provide a brief description of t...

  • Page 89: Grid Reference Index

    M860-00-preliminary t865 pcb information b6.5 copyright tel 30/06/98 grid reference index this section contains a component grid reference index to help you find components and labelled pads on the pcb layouts and circuit diagrams. This index lists the components and pads in alpha- numeric order, al...

  • Page 90

    B6.6 t865 pcb information m860-00-preliminary 30/06/98 copyright tel.

  • Page 91: Item T865-10-0000

    Item t865-10-0000 t865 preliminary pcb information page b6.7 item t865-10-0000 revision/variant c date created 25/05/98 no ref ,349-00020-45, scrw t/t m4x20mm p/poz bz no ref ,xe865vt10, t860 tunable vco assembly no ref ,240-02010-54, skt 15w drange pnl mtg 125 c no ref ,308-01007-01, handle base st...

  • Page 92

    T865 preliminary pcb information item x865-10-0000 page b6.8 c351 ,015-06100-08, cap cer 1206 100n 10% x7r 50v c353 ,015-06100-08, cap cer 1206 100n 10% x7r 50v c355 ,015-25470-08, cap cer 0805 47n 10% x7r 50v c357 ,015-23150-01, cap cer 0805 150p 5% npo 50v c359 ,015-06100-08, cap cer 1206 100n 10%...

  • Page 93

    Item x865-10-0000 t865 preliminary pcb information page b6.9 l450 ,056-00021-04, ind fxd 330nh ax l460 ,050-00016-78, coil rf 56uh nom 3.5t al core l470 ,050-00016-78, coil rf 56uh nom 3.5t al core l480 ,056-10330-02, (l) ind smd 330nh l490 ,056-10330-02, (l) ind smd 330nh l750 ,056-10068-00, ind fx...

  • Page 94

    T865 preliminary pcb information item x865-10-0000 page b6.10 r435 ,036-12100-00, res m/f 0805 10e 5% r440 ,036-13470-00, res m/f 0805 470e 5% r445 ,036-12120-00, res m/f 0805 12e 5% r450 ,036-13470-00, res m/f 0805 470e 5% r455 ,036-17100-00, res m/f 0805 1m 5% r457 ,036-17100-00, res m/f 0805 1m 5...

  • Page 95: Item T865-15-0000

    Item t865-15-0000 t865 preliminary pcb information page b6.11 item t865-15-0000 revision/variant c date created 25/05/98 no ref ,349-00020-45, scrw t/t m4x20mm p/poz bz no ref ,xe865vt10, t860 tunable vco assembly no ref ,240-02010-54, skt 15w drange pnl mtg 125 c no ref ,308-01007-01, handle base s...

  • Page 96

    T865 preliminary pcb information item x865-15-0000 page b6.12 c351 ,015-06100-08, cap cer 1206 100n 10% x7r 50v c353 ,015-06100-08, cap cer 1206 100n 10% x7r 50v c355 ,015-25470-08, cap cer 0805 47n 10% x7r 50v c357 ,015-23150-01, cap cer 0805 150p 5% npo 50v c359 ,015-06100-08, cap cer 1206 100n 10...

  • Page 97

    Item x865-15-0000 t865 preliminary pcb information page b6.13 l410 ,050-00016-78, coil rf 56uh nom 3.5t al core l420 ,050-00016-78, coil rf 56uh nom 3.5t al core l430 ,052-08140-35, coil a/w 3.5t/4.0mm hor 0.8mm l440 ,056-00021-04, ind fxd 330nh ax l450 ,056-00021-04, ind fxd 330nh ax l460 ,050-0001...

  • Page 98

    T865 preliminary pcb information item x865-15-0000 page b6.14 r510 ,036-14220-00, res m/f 0805 2k2 5% r515 ,036-12560-00, res m/f 0805 56e 5% r555 ,036-13470-00, res m/f 0805 470e 5% r615 ,036-13100-00, res m/f 0805 100e 5% r617 ,036-10000-00, res m/f 0805 zero ohm r619 ,032-31100-00, res m/f pwr 1e...

  • Page 99: Item T865-20-0000

    Item t865-20-0000 t865 preliminary pcb information page b6.15 item t865-20-0000 revision/variant c date created 25/05/98 no ref ,349-00020-45, scrw t/t m4x20mm p/poz bz no ref ,xe865vt20, t860 tunable vco assembly no ref ,240-02010-54, skt 15w drange pnl mtg 125 c no ref ,308-01007-01, handle base s...

  • Page 100

    T865 preliminary pcb information item x865-20-0000 page b6.16 c371 ,025-08100-02, cap tant bead 10m 10% 16v c373 ,025-08100-02, cap tant bead 10m 10% 16v c375 ,025-08100-02, cap tant bead 10m 10% 16v c376 ,015-23100-01, cap cer 0805 100p 5% npo 50v c377 ,015-23100-01, cap cer 0805 100p 5% npo 50v c3...

  • Page 101

    Item x865-20-0000 t865 preliminary pcb information page b6.17 l410 ,050-00016-78, coil rf 56uh nom 3.5t al core l420 ,050-00016-78, coil rf 56uh nom 3.5t al core l430 ,052-08140-35, coil a/w 3.5t/4.0mm hor 0.8mm l440 ,056-00021-04, ind fxd 330nh ax l450 ,056-00021-04, ind fxd 330nh ax l460 ,050-0001...

  • Page 102

    T865 preliminary pcb information item x865-20-0000 page b6.18 r510 ,036-14220-00, res m/f 0805 2k2 5% r515 ,036-12560-00, res m/f 0805 56e 5% r555 ,036-13470-00, res m/f 0805 470e 5% r615 ,036-13100-00, res m/f 0805 100e 5% r617 ,036-10000-00, res m/f 0805 zero ohm r619 ,032-31100-00, res m/f pwr 1e...

  • Page 103: Item T865-25-0000

    Item t865-25-0000 t865 preliminary pcb information page b6.19 item t865-25-0000 revision/variant c date created 25/05/98 no ref ,349-00020-45, scrw t/t m4x20mm p/poz bz no ref ,xe865vt20, t860 tunable vco assembly no ref ,240-02010-54, skt 15w drange pnl mtg 125 c no ref ,308-01007-01, handle base s...

  • Page 104

    T865 preliminary pcb information item x865-25-0000 page b6.20 c371 ,025-08100-02, cap tant bead 10m 10% 16v c373 ,025-08100-02, cap tant bead 10m 10% 16v c375 ,025-08100-02, cap tant bead 10m 10% 16v c376 ,015-23100-01, cap cer 0805 100p 5% npo 50v c377 ,015-23100-01, cap cer 0805 100p 5% npo 50v c3...

  • Page 105

    Item x865-25-0000 t865 preliminary pcb information page b6.21 l410 ,050-00016-78, coil rf 56uh nom 3.5t al core l420 ,050-00016-78, coil rf 56uh nom 3.5t al core l430 ,052-08140-35, coil a/w 3.5t/4.0mm hor 0.8mm l440 ,056-00021-04, ind fxd 330nh ax l450 ,056-00021-04, ind fxd 330nh ax l460 ,050-0001...

  • Page 106

    T865 preliminary pcb information item x865-25-0000 page b6.22 r510 ,036-14220-00, res m/f 0805 2k2 5% r515 ,036-12560-00, res m/f 0805 56e 5% r555 ,036-13470-00, res m/f 0805 470e 5% r615 ,036-13100-00, res m/f 0805 100e 5% r617 ,036-10000-00, res m/f 0805 zero ohm r619 ,032-31100-00, res m/f pwr 1e...

  • Page 107: T865 Grid Reference

    T865 grid reference index t865 preliminary pcb information page b6.23 device pcb circuit device pcb circuit device pcb circuit device pcb circuit t865 grid reference index a2 nil 1-a1 botfida 2:a8 10-j6 botfidb 2:p2 10-k6 bothole 2:b1 10-c6 botslot 2:p1 10-d6 c201 1:d7 2-b9 &c203 2:c6 2-b8 c205 2:c6...

  • Page 108

    T865 preliminary pcb information t865 grid reference index page b6.24 device pcb circuit device pcb circuit device pcb circuit device pcb circuit ic640 1:m5 6-r5 ic650 1:l5 6-e5 ic700 1:j3 7-a8 ic710 1:h3 7-e8 ic710 1:h3 7-j0 ic710 1:h3 7-c6 ic710 1:h3 7-d6 ic710 1:h3 7-d6 ic710 1:h3 7-c6 ic710 1:h3...

  • Page 109

    T865 grid reference index t865 preliminary pcb information page b6.25 device pcb circuit device pcb circuit device pcb circuit device pcb circuit r625 1:n6 6-l7 r629 1:m5 6-p6 r633 1:m5 6-q8 r636 1:n5 6-k6 r637 1:n5 6-k5 r641 1:n5 6-l4 r645 1:n5 6-l5 r649 1:m5 6-m5 r653 1:m5 6-q4 r681 1:l5 6-l2 r685...

  • Page 110

    T865 preliminary pcb information t865 grid reference index page b6.26.

  • Page 111: Part C

    M860-00-preliminary ci copyright tel 30/06/98 part c t867 exciter this part of the manual is divided into six sections, as listed below. There is a detailed table of contents at the start of each section. Section title 1 general information 2 circuit operation 3 initial tuning & adjustment 4 functio...

  • Page 112

    Cii m860-00-preliminary 30/06/98 copyright tel.

  • Page 113: T867 General Information

    M860-00-preliminary t867 general information c1.1 copyright tel 30/06/98 1 t867 general information this section provides a brief description of the t867 exciter, along with detailed specifi- cations and a list of types available. The following topics are covered in this section. Section title page ...

  • Page 114

    C1.2 t867 general information m860-00-preliminary 30/06/98 copyright tel.

  • Page 115: 1.1

    M860-00-preliminary t867 general information c1.3 copyright tel 30/06/98 1.1 introduction the t867 is a synthesised, microprocessor controlled fm base station exciter designed for single or multichannel operation in the 220 to 285mhz frequency range. With a standard power output of only 600mw, the e...

  • Page 116: 1.2

    C1.4 t867 general information m860-00-preliminary 30/06/98 copyright tel 1.2 specifications 1.2.1 introduction the performance figures given are minimum figures, unless otherwise indicated, for equipment tuned with the maximum switching range and operating at standard room temperature (+22 ° c to +2...

  • Page 117: 1.2.3

    M860-00-preliminary t867 general information c1.5 copyright tel 30/06/98 dimensions: height .. 183mm width .. 60mm length .. 320mm weight .. 2.1kg time-out timer (optional) .. 0 to 5 minutes adjustable in 10 second steps tail timer .. 0 to 5 seconds adjustable in 100ms steps transmit key time .. Tra...

  • Page 118: 1.2.4

    C1.6 t867 general information m860-00-preliminary 30/06/98 copyright tel intermodulation .. -40dbc with interfering signal of -30dbc .. -70dbc with 25db isolation & interfering signal of -30dbc (pa with output isolator) radiated spurious emissions: transmit .. -36dbm to 1ghz -30dbm to 4ghz standby ....

  • Page 119: 1.2.5

    M860-00-preliminary t867 general information c1.7 copyright tel 30/06/98 hum and noise: wide bandwidth .. -55db (300hz to 3khz [eia]) typical mid bandwidth .. -53db (cept) narrow bandwidth .. -50db (cept) compressor (optional): attack time .. 10ms decay time .. 800ms range .. 50db 1.2.4.3 ctcss stan...

  • Page 120

    C1.8 t867 general information m860-00-preliminary 30/06/98 copyright tel ets 300 113 march 1996 radio equipment and systems; land mobile service; technical characteristics and test conditions for radio equipment intended for the transmission of data (and speech) and having an antenna connector. Ets ...

  • Page 121: 1.3

    M860-00-preliminary t867 general information c1.9 copyright tel 30/06/98 1.3 product codes the three groups of digits in the t860 series ii product code provide information about the model, type and options fitted, according to the conventions described below. The following explanation of t860 serie...

  • Page 122: 1.4

    C1.10 t867 general information m860-00-preliminary 30/06/98 copyright tel 1.4 t867 standard product range the following table lists the range of standard t867 types (i.E. No options fitted) availa- ble at the time this manual was published. Consult your nearest tait dealer or subsidi- ary for more i...

  • Page 123: T867 Circuit Operation

    M860-00-preliminary t867 circuit operation c2.1 copyright tel 30/06/98 2 t867 circuit operation this section provides a basic description of the circuit operation of the t867 exciter. Note: unless otherwise specified, the term "pgm800win" used in this and follow- ing sections refers to version 2.00 ...

  • Page 124

    C2.2 t867 circuit operation m860-00-preliminary 30/06/98 copyright tel figure title page 2.1 2.2 2.3 2.4 2.5 2.6 2.7 t867 high level block diagram t867 microcontroller block diagram t867 synthesiser block diagram t867 two point modulation t867 audio processor block diagram t867 power supply & regula...

  • Page 125: 2.1

    M860-00-preliminary t867 circuit operation c2.3 copyright tel 30/06/98 2.1 introduction the individual circuit blocks which make up the t867 are: • synthesiser • vco • audio processor • drive amplifier • voltage regulators. Each of these circuit blocks is set in its own shielded compartment, formed ...

  • Page 126: 2.2

    C2.4 t867 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.2 microcontroller (refer to the microcontroller circuit diagram (sheet 8) in section 6.2 or 6.3.) figure 2.2 t867 microcontroller block diagram overall system control of the t867 is accomplished by the use of a member of the 80...

  • Page 127: 2.3

    M860-00-preliminary t867 circuit operation c2.5 copyright tel 30/06/98 2.3 synthesised local oscillator (refer to the synthesiser circuit diagram (sheet 7) in section 6.2 or 6.3 and the vco cir- cuit diagram in part e.) figure 2.3 t867 synthesiser block diagram the synthesiser (ic740) employs a phas...

  • Page 128: 2.3.1

    C2.6 t867 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.3.1 two point modulation frequency modulation occurs by modulating both the vco input and the synthesiser reference input. This process is called two point modulation and ensures a flat modula- tion response from 67hz to 3khz (...

  • Page 129: 2.4

    M860-00-preliminary t867 circuit operation c2.7 copyright tel 30/06/98 2.4 vco (refer to the vco circuit diagram in part e.) the vco transistor (q1) operates in a common source configuration, with an lc tank circuit coupled between its gate and drain to provide the feedback necessary for oscilla- ti...

  • Page 130: 2.5

    C2.8 t867 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.5 audio processor (refer to the audio processor circuit diagram (sheet 2) in section 6.2 or 6.3.) figure 2.5 t867 audio processor block diagram 2.5.1 general the audio processor comprises several link selectable circuit blocks ...

  • Page 131: 2.5.3

    M860-00-preliminary t867 circuit operation c2.9 copyright tel 30/06/98 2.5.3 keying inputs there are four ways to key the exciter: • pulling the tx-key line low (pin 13 on d-range 1 [pl100]) at the rear of the set); • pushing the "carrier" button on the front panel - this will inhibit all audio; • u...

  • Page 132: 2.6

    C2.10 t867 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.6 power supply & regulator circuits (refer to the regulators circuit diagram (sheet 6) in section 6.2 or 6.3.) figure 2.6 t867 power supply & regulators block diagram the t867 is designed to operate from a 10.8-16v dc supply (...

  • Page 133: 2.7

    M860-00-preliminary t867 circuit operation c2.11 copyright tel 30/06/98 2.7 transmit timers the transmit tail timer, transmit timeout timer and transmit lockout timer can all be set from pgm800win. The fields for setting these are found on the system information page. These three timers operate as f...

  • Page 134: 2.8

    C2.12 t867 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.8 t867 exciter drive amplifier (refer to figure 2.1 and the exciter circuit diagram (sheet 3) in section 6.3.) a two-stage, wide band amplifier (q365, q370) provides an output level of approxi- mately 600mw (+27dbm) for an inp...

  • Page 135

    M860-00-preliminary t867 initial tuning & adjustment c3.1 copyright tel 30/06/98 3 t867 initial tuning & adjustment the following section describes both short and full tuning and adjustment procedures and provides information on: • channel programming • selecting required audio links • synthesiser a...

  • Page 136

    C3.2 t867 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.8 3.8.1 3.8.2 3.8.3 3.8.4 3.8.5 3.8.5.1 3.8.5.2 3.8.5.3 audio processor two point modulation modulator adjustment limiter adjustment line level without compressor compressor compressor on line input only compressor on...

  • Page 137: 3.1

    M860-00-preliminary t867 initial tuning & adjustment c3.3 copyright tel 30/06/98 3.1 introduction when you receive your t867 exciter it will be run up and working on a particular fre- quency (the "default channel") 1 . If you want to switch to a frequency that is within the 8mhz switching range (i.E...

  • Page 138: 3.3

    C3.4 t867 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.3 test equipment required you will need the following test equipment: • computer with pgm800win installed • t800 programming kit • module programming interface (e.G. T800-01-0004 - optional) • 13.8v power supply • dig...

  • Page 139: 3.4

    M860-00-preliminary t867 initial tuning & adjustment c3.5 copyright tel 30/06/98 3.4 short tuning procedure use this procedure only if you want to reprogram the t867 to a frequency outside the 8mhz switching range and do not intend to carry out any other major adjustments or repairs. 3.4.1 introduct...

  • Page 140: 3.4.3

    C3.6 t867 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.4.3 two point modulation adjustment note 1: in this and following sections deviation settings are given first for wide bandwidth sets, followed by settings in brackets for mid bandwidth sets ( ) and narrow bandwidth s...

  • Page 141: 3.4.5

    M860-00-preliminary t867 initial tuning & adjustment c3.7 copyright tel 30/06/98 adjust rv210 (line sensitivity) fully clockwise and key the exciter by earthing the tx key line. Adjust “deviation” via pgm800win to set the peak deviation to ±4.7khz (±3.8khz) [±2.3khz] (you can use either the mouse or...

  • Page 142: 3.5

    C3.8 t867 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.5 audio processor links 3.5.1 link details use the following table to set up the audio processor to the configuration you require. You should set the audio processor links before carrying out any of the tuning and adj...

  • Page 143: 3.6

    M860-00-preliminary t867 initial tuning & adjustment c3.9 copyright tel 30/06/98 3.6 synthesiser alignment • ensure that the t867 has been programmed with the required frequencies using pgm800win software. • single channel select a channel using pgm800win. Multichannel select the middle channel via ...

  • Page 144: 3.7

    C3.10 t867 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel 3.7 audio processor 3.7.1 two point modulation the t867 utilises two point modulation to obtain a wide audio bandwidth independent of the synthesiser loop filter response. This is achieved by simultaneously frequency m...

  • Page 145: 3.7.3

    M860-00-preliminary t867 initial tuning & adjustment c3.11 copyright tel 30/06/98 3.7.3 limiter adjustment note: if the t867 will be used over the whole 8mhz switching range, you must set the deviation for each channel. However, if the module will be used on fre- quencies that cover only a 1mhz (or ...

  • Page 146

    C3.12 t867 initial tuning & adjustment m860-00-preliminary 30/06/98 copyright tel check that ±3khz (±2.4khz) [±1.5khz] deviation is still available. Slowly increase the audio input level until the demodulated waveform shows sig- nificant signs of clipping (approximately ±4.5khz (±3.6khz) [±2.3khz] d...

  • Page 147: T867 Functional Testing

    M860-00-preliminary t867 functional testing c4.1 copyright tel 30/06/98 4 t867 functional testing the following test procedures will confirm that the t867 has been tuned and adjusted correctly and is fully operational. Note 1: in this and following sections deviation settings are given first for wid...

  • Page 148

    C4.2 t867 functional testing m860-00-preliminary 30/06/98 copyright tel.

  • Page 149: 4.1

    M860-00-preliminary t867 functional testing c4.3 copyright tel 30/06/98 4.1 current consumption connect the t867 to a 13.8v power supply. Connect an rf power meter to the t867 output socket. Check that the current in the 13.8v power cable is less than 150ma. Key the t867 by earthing the tx-key line ...

  • Page 150: 4.5

    C4.4 t867 functional testing m860-00-preliminary 30/06/98 copyright tel figure 4.1 t867 transmit timers 4.5 frequency response if the t867 has been correctly adjusted, the pre-emphasis and limiting responses should closely match those shown in figure 4.2 and figure 4.3 respectively. Note: the limits...

  • Page 151

    M860-00-preliminary t867 functional testing c4.5 copyright tel 30/06/98 figure 4.2 t867 pre-emphasis response wide bandwidth narrow bandwidth mid bandwidth the mid bandwidth graph is the same shape as the wide bandwidth graph. The devia- tion figures are as follows: peak + max. Deviation = +0.8khz p...

  • Page 152

    C4.6 t867 functional testing m860-00-preliminary 30/06/98 copyright tel figure 4.3 t867 limiting response wide bandwidth narrow bandwidth 100 500 300 5k 50 +10 +8 modulation level (db ref. To max. Dev .) +6 +4 +2 +0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 -22 10 20 30 200 1k 2k 3k 10k frequency (hz) pea...

  • Page 153: 4.6

    M860-00-preliminary t867 functional testing c4.7 copyright tel 30/06/98 4.6 audio level input sensitivity • adjust rv210 (line sensitivity) fully clockwise. • check that the input sensitivities are better than those specified below: note: a degraded signal to noise ratio can be expected with the com...

  • Page 154

    C4.8 t867 functional testing m860-00-preliminary 30/06/98 copyright tel.

  • Page 155: T867 Fault Finding

    M860-00-preliminary t867 fault finding c5.1 copyright tel 30/06/98 5 t867 fault finding the following test procedures and fault finding flow charts may be used to help locate a hardware problem, however they are by no means a complete fault finding procedure. If you still cannot trace the fault afte...

  • Page 156

    C5.2 t867 fault finding m860-00-preliminary 30/06/98 copyright tel figure title page 5.1 rf diode probe circuit 5.5.

  • Page 157: 5.1

    M860-00-preliminary t867 fault finding c5.3 copyright tel 30/06/98 5.1 visual checks remove the covers from the t867 and inspect the pcb for damaged or broken compo- nents, paying particular attention to the surface mounted devices (smd's). Check for defective solder joints. If repair or replacement...

  • Page 158: 5.4

    C5.4 t867 fault finding m860-00-preliminary 30/06/98 copyright tel 5.4 dc checks 5.4.1 power rails refer to the test points and options diagrams in section 6 for test point locations, and to the regulator fault finding chart (section 5.7.2) for fault diagnosis. Check the 13.8v (tp601) and 9v (tp602)...

  • Page 159: 5.5

    M860-00-preliminary t867 fault finding c5.5 copyright tel 30/06/98 5.5 rf checks in-circuit rf levels may be measured with an rf probe on which the earth lead has been shortened to a minimum (i.E. 13mm). Refer to the circuit diagrams for typical levels. Figure 5.1 shows a suitable rf probe circuit.....

  • Page 160: 5.6

    C5.6 t867 fault finding m860-00-preliminary 30/06/98 copyright tel 5.6 pgm800win generated errors the following errors are those most likely to occur using pgm800win. Refer to the pgm800win software user’s manual for a complete list of error messages. Channel switch set the programmed default channe...

  • Page 161: 5.7

    M860-00-preliminary t867 fault finding c5.7 copyright tel 30/06/98 5.7 fault finding charts note: the standard test point designations used in this section are as follows: tp601 13.8v tp602 9v tp603 20v tp604 5v 5.7.1 microcontroller (ic810) 5.7.1.1 basic checks pulsing check state of pin 35. Y is p...

  • Page 162

    C5.8 t867 fault finding m860-00-preliminary 30/06/98 copyright tel 5.7.1.2 serial communication check pin state. Y low/floating n noise on pin disconnect the programming lead. Is ic810 pin 11 high? (microcontroller) y *digital storage oscilloscope use pgm800win to send a poll command to the radio. C...

  • Page 163

    M860-00-preliminary t867 fault finding c5.9 copyright tel 30/06/98 5.7.1.3 ctcss encode y y y replace ic810. Use pgm800win to select a channel with a ctcss tone programmed. Check serial communications. (see separate flow chart). Cannot select a channel check ic810 pins 24, 25 & 26 (microcontroller)....

  • Page 164: 5.7.2

    C5.10 t867 fault finding m860-00-preliminary 30/06/98 copyright tel 5.7.2 regulator n y 13.8v present on ic610 pin 3? Check for overheating components & short circuits. 5.3v present on ic610 pin 1? Replace ic610. N y check q630, q620 & ic640. N y 9.0v present on tp602? Check q660 is switching at app...

  • Page 165: 5.7.3

    M860-00-preliminary t867 fault finding c5.11 copyright tel 30/06/98 5.7.3 synthesiser refer to the synthesiser circuit diagram (sheet 7) in section 6 and the vco circuit dia- gram in part e. N a b check biasing resistors, q4 & q5. N y n 8.3v present at vco? Dc v present at q4 & q5? 9v present at vco...

  • Page 166

    C5.12 t867 fault finding m860-00-preliminary 30/06/98 copyright tel programming and serial bus ok? Check programming. Check serial bus when programming i.E. Clock/data/enable activity (ic740 pins 18, 19 & 17). N check loop filter components r775, c774, c776, r510, c505, ic750. Is the supply to ic750...

  • Page 167

    M860-00-preliminary t867 fault finding c5.13 copyright tel 30/06/98 y n y y correct dc v present on q1 vco? N check inductors, biasing resistors & q1. Replace if faulty. Go to b. Loop filter & components around op. Amp. (ic750) ok? N noisy synth; poor residual fm. C isolate audio modulation on vco; ...

  • Page 168: 5.7.4

    C5.14 t867 fault finding m860-00-preliminary 30/06/98 copyright tel 5.7.4 t867 exciter drive amplifier 10.5v at q315 collector? Check ic330, r324 & r326. Check q310 & q315. >1.5v rf at q370 base? Check attenuator pad r359, r360, r362. Check q365. Check signal path between q365 & q370. Check q370. 3....

  • Page 169: 5.7.5

    M860-00-preliminary t867 fault finding c5.15 copyright tel 30/06/98 5.7.5 audio processor n ic240 pin 6 at 9v? Key exciter & lock synthesiser. Connect 1khz audio to external ctcss input. Does exciter modulate? Audio output at ic260 pin 8? N y check audio path to vco control line. Check alignment of ...

  • Page 170

    C5.16 t867 fault finding m860-00-preliminary 30/06/98 copyright tel.

  • Page 171: T867 Pcb Information

    M860-00-preliminary t867 pcb information c6.1 copyright tel 30/06/98 6 t867 pcb information this section provides the following information on the t867 exciter: • parts lists • grid reference indexes • pcb layouts • test points & options connections drawings • circuit diagrams.

  • Page 172

    C6.2 t867 pcb information m860-00-preliminary 30/06/98 copyright tel.

  • Page 173: 6.1

    M860-00-preliminary t867 pcb information c6.3 copyright tel 30/06/98 6.1 introduction product type identification you can identify the exciter type by checking the product code printed on a label on the rear of the chassis (product codes are explained in section 1.3 in this part of the manual, and f...

  • Page 174: Parts Lists

    C6.4 t867 pcb information m860-00-preliminary 30/06/98 copyright tel parts lists the 10 digit numbers (000-00000-00) in this parts list are “internal part numbers” (ipns). We can process your spare parts orders more efficiently and accurately if you quote the ipn and provide a brief description of t...

  • Page 175: Grid Reference Index

    M860-00-preliminary t867 pcb information c6.5 copyright tel 30/06/98 grid reference index this section contains a component grid reference index to help you find components and labelled pads on the pcb layouts and circuit diagrams. This index lists the components and pads in alpha- numeric order, al...

  • Page 176

    C6.6 t867 pcb information m860-00-preliminary 30/06/98 copyright tel.

  • Page 177: Item T867-10-0000

    Item t867-10-0000 t867 preliminary pcb information page c6.7 item t867-10-0000 revision/variant c date created 25/05/98 no ref ,352-00010-29, nut m4 nyloc hex no ref ,308-01007-01, handle base station series ii no ref ,312-01052-02, lid top t800 ser ii ptnd no ref ,312-01053-02, lid bottom t800 ser ...

  • Page 178

    T867 preliminary pcb information item x867-10-0000 page c6.8 c370 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c373 ,015-25470-08, cap cer 0805 47n 10% x7r 50v c376 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c379 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c382 ,015-21560-01, cap cer 0805 5p6+-1/4p npo...

  • Page 179

    Item x867-10-0000 t867 preliminary pcb information page c6.9 q530 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q540 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q550 ,000-10008-48, s) xstr smd bcw60 npn sot23 ss q610 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q620 ,000-00012-15, s) xstr bd234 p...

  • Page 180

    T867 preliminary pcb information item x867-10-0000 page c6.10 r706 ,036-15150-00, res m/f 0805 15k 5% r708 ,036-16100-00, res m/f 0805 100k 5% r710 ,036-13100-00, res m/f 0805 100e 5% r711 ,036-13100-00, res m/f 0805 100e 5% r712 ,036-12100-00, res m/f 0805 10e 5% r713 ,036-12220-00, res m/f 0805 22...

  • Page 181: Item T867-15-0000

    Item t867-15-0000 t867 preliminary pcb information page c6.11 item t867-15-0000 revision/variant c date created 25/05/98 no ref ,352-00010-29, nut m4 nyloc hex no ref ,308-01007-01, handle base station series ii no ref ,312-01052-02, lid top t800 ser ii ptnd no ref ,312-01053-02, lid bottom t800 ser...

  • Page 182

    T867 preliminary pcb information item x867-15-0000 page c6.12 c370 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c373 ,015-25470-08, cap cer 0805 47n 10% x7r 50v c376 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c379 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c382 ,015-21560-01, cap cer 0805 5p6+-1/4p np...

  • Page 183

    Item x867-15-0000 t867 preliminary pcb information page c6.13 q530 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q540 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q550 ,000-10008-48, s) xstr smd bcw60 npn sot23 ss q610 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q620 ,000-00012-15, s) xstr bd234 ...

  • Page 184

    T867 preliminary pcb information item x867-15-0000 page c6.14 r706 ,036-15150-00, res m/f 0805 15k 5% r708 ,036-16100-00, res m/f 0805 100k 5% r710 ,036-13100-00, res m/f 0805 100e 5% r711 ,036-13100-00, res m/f 0805 100e 5% r712 ,036-12100-00, res m/f 0805 10e 5% r713 ,036-12220-00, res m/f 0805 22...

  • Page 185: Item T867-20-0000

    Item t867-20-0000 t867 preliminary pcb information page c6.15 item t867-20-0000 revision/variant c date created 25/05/98 no ref ,352-00010-29, nut m4 nyloc hex no ref ,308-01007-01, handle base station series ii no ref ,312-01052-02, lid top t800 ser ii ptnd no ref ,312-01053-02, lid bottom t800 ser...

  • Page 186

    T867 preliminary pcb information item x867-20-0000 page c6.16 c370 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c373 ,015-25470-08, cap cer 0805 47n 10% x7r 50v c376 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c379 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c382 ,015-21560-01, cap cer 0805 5p6+-1/4p np...

  • Page 187

    Item x867-20-0000 t867 preliminary pcb information page c6.17 q530 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q540 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q550 ,000-10008-48, s) xstr smd bcw60 npn sot23 ss q610 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q620 ,000-00012-15, s) xstr bd234 ...

  • Page 188

    T867 preliminary pcb information item x867-20-0000 page c6.18 r706 ,036-15150-00, res m/f 0805 15k 5% r708 ,036-16100-00, res m/f 0805 100k 5% r710 ,036-13100-00, res m/f 0805 100e 5% r711 ,036-13100-00, res m/f 0805 100e 5% r712 ,036-12100-00, res m/f 0805 10e 5% r713 ,036-12220-00, res m/f 0805 22...

  • Page 189: Item T867-25-0000

    Item t867-25-0000 t867 preliminary pcb information page c6.19 item t867-25-0000 revision/variant c date created 25/05/98 no ref ,352-00010-29, nut m4 nyloc hex no ref ,308-01007-01, handle base station series ii no ref ,312-01052-02, lid top t800 ser ii ptnd no ref ,312-01053-02, lid bottom t800 ser...

  • Page 190

    T867 preliminary pcb information item x867-25-0000 page c6.20 c370 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c373 ,015-25470-08, cap cer 0805 47n 10% x7r 50v c376 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c379 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c382 ,015-21560-01, cap cer 0805 5p6+-1/4p np...

  • Page 191

    Item x867-25-0000 t867 preliminary pcb information page c6.21 q530 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q540 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q550 ,000-10008-48, s) xstr smd bcw60 npn sot23 ss q610 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q620 ,000-00012-15, s) xstr bd234 ...

  • Page 192

    T867 preliminary pcb information item x867-25-0000 page c6.22 r706 ,036-15150-00, res m/f 0805 15k 5% r708 ,036-16100-00, res m/f 0805 100k 5% r710 ,036-13100-00, res m/f 0805 100e 5% r711 ,036-13100-00, res m/f 0805 100e 5% r712 ,036-12100-00, res m/f 0805 10e 5% r713 ,036-12220-00, res m/f 0805 22...

  • Page 193: Item T867-30-0000

    Item t867-30-0000 t867 preliminary pcb information page c6.23 item t867-30-0000 revision/variant c date created 25/05/98 no ref ,352-00010-29, nut m4 nyloc hex no ref ,308-01007-01, handle base station series ii no ref ,312-01052-02, lid top t800 ser ii ptnd no ref ,312-01053-02, lid bottom t800 ser...

  • Page 194

    T867 preliminary pcb information item x867-30-0000 page c6.24 c370 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c373 ,015-25470-08, cap cer 0805 47n 10% x7r 50v c376 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c379 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c382 ,015-21560-01, cap cer 0805 5p6+-1/4p np...

  • Page 195

    Item x867-30-0000 t867 preliminary pcb information page c6.25 q530 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q540 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q550 ,000-10008-48, s) xstr smd bcw60 npn sot23 ss q610 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q620 ,000-00012-15, s) xstr bd234 ...

  • Page 196

    T867 preliminary pcb information item x867-30-0000 page c6.26 r706 ,036-15150-00, res m/f 0805 15k 5% r708 ,036-16100-00, res m/f 0805 100k 5% r710 ,036-13100-00, res m/f 0805 100e 5% r711 ,036-13100-00, res m/f 0805 100e 5% r712 ,036-12100-00, res m/f 0805 10e 5% r713 ,036-12220-00, res m/f 0805 22...

  • Page 197: Item T867-35-0000

    Item t867-35-0000 t867 preliminary pcb information page c6.27 item t867-35-0000 revision/variant c date created 25/05/98 no ref ,352-00010-29, nut m4 nyloc hex no ref ,308-01007-01, handle base station series ii no ref ,312-01052-02, lid top t800 ser ii ptnd no ref ,312-01053-02, lid bottom t800 ser...

  • Page 198

    T867 preliminary pcb information item x867-35-0000 page c6.28 c370 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c373 ,015-25470-08, cap cer 0805 47n 10% x7r 50v c376 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c379 ,015-24100-08, cap cer 0805 1n 10% x7r 50v c382 ,015-21560-01, cap cer 0805 5p6+-1/4p np...

  • Page 199

    Item x867-35-0000 t867 preliminary pcb information page c6.29 q530 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q540 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q550 ,000-10008-48, s) xstr smd bcw60 npn sot23 ss q610 ,000-10008-07, s) xstr smd bc807 pnp sot23 af q620 ,000-00012-15, s) xstr bd234 ...

  • Page 200

    T867 preliminary pcb information item x867-35-0000 page c6.30 r708 ,036-16100-00, res m/f 0805 100k 5% r710 ,036-13100-00, res m/f 0805 100e 5% r711 ,036-13100-00, res m/f 0805 100e 5% r712 ,036-12100-00, res m/f 0805 10e 5% r713 ,036-12220-00, res m/f 0805 22e 5% r714 ,036-12100-00, res m/f 0805 10...

  • Page 201: T867 Grid Reference

    T867 grid reference index t867 preliminary pcb information page c6.31 device pcb circuit device pcb circuit device pcb circuit device pcb circuit t867 grid reference index a2 nil 1-a1 botfida 2:a8 10-j6 botfidb 2:p2 10-k6 bothole 2:b1 10-c6 botslot 2:p1 10-d6 c201 1:c1 2-b8 c202 1:c1 2-c8 c204 1:a2 ...

  • Page 202

    T867 preliminary pcb information t867 grid reference index page c6.32 device pcb circuit device pcb circuit device pcb circuit device pcb circuit o10 nil 1-m0 p4 nil 1-h8 p100 1:p6 1-r8 p150 1:p2 1-q4 p160 1:p2 1-q4 p170 1:p2 1-q3 p204 1:d1 2-a8 p208 1:d1 2-a8 p215 1:d4 2-a2 p217 1:d4 2-a2 p219 1:d2...

  • Page 203

    T867 grid reference index t867 preliminary pcb information page c6.33 device pcb circuit device pcb circuit device pcb circuit device pcb circuit r742 1:h2 7-b4 r743 1:h2 7-c5 r744 1:g2 7-d4 r746 1:h3 7-e4 r747 1:h3 7-e5 r748 1:j2 7-a1 r749 1:j2 7-b1 r750 1:h4 7-q7 r752 1:g4 7-f5 r753 1:g4 7-f3 r754...

  • Page 204

    T867 preliminary pcb information t867 grid reference index page c6.34.

  • Page 205: Part D

    M860-00-preliminary di copyright tel 30/06/98 part d t869 power amplifier caution: there are no user serviceable components in this power amplifier. Refer all servicing to your nearest approved tait dealer or service cen- tre. This part of the manual is divided into five sections, as listed below. T...

  • Page 206

    Dii m860-00-preliminary 30/06/98 copyright tel.

  • Page 207: T869 General Information

    M860-00-preliminary t869 general information d1.1 copyright tel 30/06/98 1 t869 general information this section provides a brief description of the t869 pa, along with detailed specifica- tions and a list of types available. The following topics are covered in this section. Section title page 1.1 i...

  • Page 208

    D1.2 t869 general information m860-00-preliminary 30/06/98 copyright tel.

  • Page 209: 1.1

    M860-00-preliminary t869 general information d1.3 copyright tel 30/06/98 1.1 introduction the t869 is an fm base station power amplifier designed for single or multichannel operation within the frequency range 220 to 285mhz. The output power capability is 20 to 100w. The pa comprises a broad band dr...

  • Page 210: 1.2

    D1.4 t869 general information m860-00-preliminary 30/06/98 copyright tel 1.2 specifications 1.2.1 introduction the performance figures given are minimum figures, unless otherwise indicated, for equipment tuned with the maximum switching band and operating at standard room temperature (+22 ° c to +28...

  • Page 211

    M860-00-preliminary t869 general information d1.5 copyright tel 30/06/98 spurious emissions: conducted - transmit .. -36dbm to 1ghz -30dbm to 4ghz - standby .. -57dbm to 1ghz -47dbm to 4ghz radiated - transmit .. -36dbm to 1ghz -30dbm to 4ghz - standby .. -57dbm to 1ghz -47dbm to 4ghz dimensions: he...

  • Page 212: 1.3

    D1.6 t869 general information m860-00-preliminary 30/06/98 copyright tel 1.3 product codes the three groups of digits in the t860 series ii product code provide information about the model, type and options fitted, according to the conventions described below. The following explanation of t860 serie...

  • Page 213: 1.4

    M860-00-preliminary t869 general information d1.7 copyright tel 30/06/98 1.4 standard product range the following table lists the range of standard t865 types (i.E. No options fitted) availa- ble at the time this manual was published. Consult your nearest tait dealer or subsidi- ary for more informa...

  • Page 214

    D1.8 t869 general information m860-00-preliminary 30/06/98 copyright tel.

  • Page 215: T869 Circuit Operation

    M860-00-preliminary t869 circuit operation d2.1 copyright tel 30/06/98 2 t869 circuit operation this section provides a basic description of the circuit operation of the t869 pa. The following topics are covered in this section. Section title page 2.1 introduction 2.3 2.2 rf circuitry 2.5 2.3 2.3.1 ...

  • Page 216

    D2.2 t869 circuit operation m860-00-preliminary 30/06/98 copyright tel.

  • Page 217: 2.1

    M860-00-preliminary t869 circuit operation d2.3 copyright tel 30/06/98 2.1 introduction figure 2.1 t869 high level block diagram the t869 comprises a two stage rf power amplifier with extensive control circuitry: • the input stage consists of an rf power module which increases the drive level to app...

  • Page 218

    D2.4 t869 circuit operation m860-00-preliminary 30/06/98 copyright tel figure 2.2 t869 main circuit block identification ke y: 1 2 3 4 5 6 pow er co ntr o l & a larms d ri v e a m plif ier inpu t split ter fi na l am plif iers outpu t com b iner lo w pa ss f ilter & dir ec ti o n al co upl er a b c ...

  • Page 219: 2.2

    M860-00-preliminary t869 circuit operation d2.5 copyright tel 30/06/98 2.2 rf circuitry (refer to the rf section circuit diagram in section 5.) the driver stage of the t869 consists of an rf power module which delivers 20-30w to the final transistors. This signal is split via a 3db quadrature hybrid...

  • Page 220: 2.3

    D2.6 t869 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.3 control circuitry (refer to the control section circuit diagram in section 5.) figure 2.3 t869 control circuitry block diagram + comparator q17 q16 fet switch + + + comparator fet switch q11 ic1 rv52 high reverse power led lo...

  • Page 221: 2.3.1

    M860-00-preliminary t869 circuit operation d2.7 copyright tel 30/06/98 2.3.1 power control the dc voltages from the directional coupler representing forward and reflected power are buffered by the two voltage followers, ic1 pins 1, 2 & 3 and pins 8, 9 & 10. Their out- puts are summed at an integrato...

  • Page 222: 2.3.5

    D2.8 t869 circuit operation m860-00-preliminary 30/06/98 copyright tel 2.3.5 forward and reverse power metering forward and reverse power signals from the two ic1 buffers are available for metering purposes. The output currents are adjustable via rv43 (forward power) and rv57 (reverse power). 2.3.6 ...

  • Page 223: T869 Initial Adjustment

    M860-00-preliminary t869 initial adjustment d3.1 copyright tel 30/06/98 3 t869 initial adjustment the following section describes the full adjustment procedure to be carried out before operating the t869. Note: the t869 requires no rf tuning or alignment. Refer to section 5 where the parts lists, gr...

  • Page 224

    D3.2 t869 initial adjustment m860-00-preliminary 30/06/98 copyright tel.

  • Page 225: 3.1

    M860-00-preliminary t869 initial adjustment d3.3 copyright tel 30/06/98 3.1 test equipment required • dc power supply capable of delivering 30a at 13.8v. • multimeter or dmm (e.G. Fluke 77). • rf power meter (e.G. Hp 435 series or bird wattmeter). • 100w 30db attenuator. • 100w 3db 50 ohm pad. • 'bn...

  • Page 226: 3.3

    D3.4 t869 initial adjustment m860-00-preliminary 30/06/98 copyright tel check that the regulated power control supply is approximately 7v. Note: the output power and alarm levels should be set with the cover shield on. If the cover is removed for other adjustment procedures, make a final check of th...

  • Page 227: 3.4

    M860-00-preliminary t869 initial adjustment d3.5 copyright tel 30/06/98 3.4 limiting the maximum output power refer to the control section circuit diagram in section 5. 3.5 high temperature shutdown power level set rv63 (power control) to the required output power. Earth pin 9 of ic3 (the pad at ntc...

  • Page 228: 3.8

    D3.6 t869 initial adjustment m860-00-preliminary 30/06/98 copyright tel 3.8 setting alarm levels note: if forward and reverse power metering is being used, set up their calibration (section 3.6 and section 3.7) before setting the alarm levels. 3.8.1 forward power power up the t869 and adjust the fro...

  • Page 229: T869 Fault Finding

    M860-00-preliminary t869 fault finding d4.1 copyright tel 30/06/98 4 t869 fault finding the following test procedures and fault finding flow charts may be used to help locate a hardware problem, however they are by no means a complete fault finding procedure. If the fault still exists after having p...

  • Page 230

    D4.2 t869 fault finding m860-00-preliminary 30/06/98 copyright tel.

  • Page 231: 4.1

    M860-00-preliminary t869 fault finding d4.3 copyright tel 30/06/98 4.1 visual checks remove the cover from the t869 and inspect the pcb for damaged or broken com- ponents, paying particular attention to the surface mounted devices (smd's). Check for defective solder joints. If repair or replacement ...

  • Page 232: 4.4

    D4.4 t869 fault finding m860-00-preliminary 30/06/98 copyright tel 4.4 rf checks the pa fault finding chart (section 4.5.1) provides a systematic approach for locating a fault in the rf circuitry. Use this chart in conjunction with figure 4.1, which shows the locations of the 50 Ω input and output t...

  • Page 233

    M860-00-preliminary t869 fault finding d4.5 copyright tel 30/06/98 replace a4 pages d4.5/d4.6 with a3 pages d4.5/d4.6.

  • Page 234

    D4.6 t869 fault finding m860-00-preliminary 30/06/98 copyright tel replace a4 pages d4.5/d4.6 with a3 pages d4.5/d4.6.

  • Page 235: 4.5

    M860-00-preliminary t869 fault finding d4.7 copyright tel 30/06/98 4.5 fault finding charts 4.5.1 pa are rv69 & rv63 fully clockwise? Rotate clockwise: rv63 first, rv69 second. Rf circuitry ok. Replace splitter hybrid. Return pa to your local tait service centre. Replace combiner hybrid. N n n y y y...

  • Page 236: 4.5.2

    D4.8 t869 fault finding m860-00-preliminary 30/06/98 copyright tel 4.5.2 power control approximate voltages (@ 260mhz) under normal operating conditions: forward & reverse power measurement output power 40w 100w forward power at ic1 pin 1 forward power at ic1 pin 2 reverse power at ic1 pin 8 reverse...

  • Page 237: 4.5.3

    M860-00-preliminary t869 fault finding d4.9 copyright tel 30/06/98 4.5.3 fan control circuitry key transmitter. Does fan run at room temperature? Does the low temperature inhibit circuit stop the fan? N n y y do not key transmitter. Does high temperature control circuit activate fan? Fan control ok....

  • Page 238

    D4.10 t869 fault finding m860-00-preliminary 30/06/98 copyright tel.

  • Page 239: T869 Pcb Information

    M860-00-preliminary t869 pcb information d5.1.1 copyright tel 30/06/98 5 t869 pcb information this section provides the following information on the t869 power amplifier: • parts lists • grid reference index • exploded view mechanical drawing • pcb layouts • circuit diagrams. Section title ipn page ...

  • Page 240

    D5.1.2 t869 pcb information m860-00-preliminary 30/06/98 copyright tel.

  • Page 241: 5.1

    M860-00-preliminary t869 pcb information d5.1.3 copyright tel 30/06/98 5.1 introduction pcb identification all pcbs are identified by a unique 10 digit “internal part number” (ipn), e.G. 220-12345-00, which is screen printed onto the pcb (usually on the top side). The last 2 digits of this number de...

  • Page 242: Grid Reference Index

    D5.1.4 t869 pcb information m860-00-preliminary 30/06/98 copyright tel grid reference index to assist in locating components and labelled pads on the pcb layouts and circuit diagrams, a com- ponent grid reference index has been provided. This index lists the components and pads in alpha- numeric ord...

  • Page 243: 5.2

    M860-00-preliminary t869 pcb information d5.2.1 copyright tel 30/06/98 5.2 t869 power amplifier pcb this section contains the following information. Ipn section page 220-01371-01 parts list mechanical & miscellaneous parts mechanical assembly rack frame guide mechanical assembly grid reference index...

  • Page 244

    D5.2.2 t869 pcb information m860-00-preliminary 30/06/98 copyright tel.

  • Page 245

    M860-00-preliminary t869 pcb information d5.2.3 copyright tel 30/06/98 t869 parts list (ipn 220-01371-01) how to use this parts list the components listed in this parts list are divided into two main types: those with a circuit reference (e.G. C2, d1, r121, etc.) and those without (miscellaneous and...

  • Page 246

    D5.2.4 t869 pcb information m860-00-preliminary 30/06/98 copyright tel ref var ipn description ref var ipn description c2 015-24470-08 cap cer 0805 chip 4n7 10% x7r 50v c3 015-23680-08 cap cer 0805 chip 680p 10% x7r 50v c4 015-23680-08 cap cer 0805 chip 680p 10% x7r 50v c8 015-27100-10 cap cer 0805 ...

  • Page 247

    M860-00-preliminary t869 pcb information d5.2.5 copyright tel 30/06/98 ref var ipn description ref var ipn description l63 065-10004-20 bead fe smd cbd 4.6/3/3-4s2 #l67 10 052-08130-45 coil a/w 4.5t/3.0mm hor 0.8mm wire #l67 20 052-08130-45 coil a/w 4.5t/3.0mm hor 0.8mm wire #l67 30 052-08130-25 coi...

  • Page 248

    D5.2.6 t869 pcb information m860-00-preliminary 30/06/98 copyright tel ipn legend description ipn legend description t869 mechanical & miscellaneous parts (220-01371-01) 012-04100-05 29 cap f/thru 1n suppr fltr stud mtg 012-04150-01 21 cap cer f/thru 1n5 no lead 051-00006-02 solder spring 1.3mm a4m1...

  • Page 249

    M860-00-preliminary t869 pcb information d5.2.7 copyright tel 30/06/98 replace a4 pages d5.2.7/d5.2.8 with a3 pages d5.2.7/d5.2.8.

  • Page 250

    D5.2.8 t869 pcb information m860-00-preliminary 30/06/98 copyright tel replace a4 pages d5.2.7/d5.2.8 with a3 pages d5.2.7/d5.2.8.

  • Page 251

    M860-00-preliminary t869 pcb information d5.2.9 copyright tel 30/06/98 t869 grid reference index (ipn 220-01371-01) how to use this grid reference index the first digit in the pcb layout reference is a "1" or "2", indicating the top or bottom side layout respectively, and the last two charac- ters g...

  • Page 252

    D5.2.10 t869 pcb information m860-00-preliminary 30/06/98 copyright tel device pcb circuit device pcb circuit device pcb circuit device pcb circuit q59 1:h3 2-k9 q60 1:h4 2-k6 q61 1:h5 2-k3 q62 1:h6 2-k1 r1 1:p7 1-c6 r2 1:b5 1-e5 r3 1:b5 1-e5 r4 1:b4 1-f5 r5 1:b4 1-g5 r6 1:b4 1-g5 r7 1:b4 1-h5 r8 1:...

  • Page 253

    M860-00-preliminary t869 pcb information d5.2.11 copyright tel 30/06/98 t869 pcb encoding errors (ipn 220-01371-01) the following diagram shows corrections to the encoding printed on the top side of the pcb. Correction correction.

  • Page 254

    D5.2.12 t869 pcb information m860-00-preliminary 30/06/98 copyright tel.

  • Page 255: Part E

    M860-00-preliminary ei copyright tel 30/06/98 part e t860 vco pcb information this part of the manual is divided into the sections listed below. These sections provide parts lists, pcb layouts and circuit diagrams for the t860 vco pcb. There is a detailed table of contents at the start of each secti...

  • Page 256

    Eii m860-00-preliminary 30/06/98 copyright tel.

  • Page 257: T860 Vco Pcb

    M860-00-preliminary t860 vco pcb information e1.1 copyright tel 30/06/98 1 t860 vco pcb this section contains the following information. Ipn section page 220-01399-02 parts list pcb layout - bottom side pcb layout - top side circuit diagram 1.3 1.5 1.6 1.7.

  • Page 258

    E1.2 t860 vco pcb information m860-00-preliminary 30/06/98 copyright tel.

  • Page 259

    M860-00-preliminary t860 vco pcb information e1.3 copyright tel 30/06/98 t860 vco parts list (ipn 220-01399-02) how to use this parts list the components listed in this parts list are divided into two main types: those with a circuit reference (e.G. C2, d1, r121, etc.) and those without (miscellaneo...

  • Page 260

    E1.4 t860 vco pcb information m860-00-preliminary 30/06/98 copyright tel ref var ipn description ref var ipn description r7 036-12220-00 res m/f 0805 22e 5% r9 036-12560-00 res m/f 0805 56e 5% r11 036-12220-00 res m/f 0805 22e 5% r12 036-14270-00 res m/f 0805 2k7 5% r13 036-13180-00 res m/f 0805 180...

  • Page 261

    T860 vco pcb (ipn 220-01399-02) - bottom side copyright tel 30/06/98 m860-00-preliminary t860 vco pcb information e1.5 220-01399-02.

  • Page 262

    E1.6 t860 vco pcb information m860-00-preliminary 30/06/98 copyright tel t860 vco pcb (ipn 220-01399-02) - top side a #c1 #c2 #c36 #cpa #cpb #csa #csb #l #r6 c10 c12 c13 c14 c16 c17 c18 c19 c20 c21 c22 c23 c24 c25 c26 c27 c3 c30 c31 c35 c4 c5 c6 c7 c9 cf ct d1 d2 l1 l2 l3 l4 l6 l7 l8 l9 q1 q2 q3 q4 ...

  • Page 263: Part F

    M860-00-preliminary fi copyright tel 30/06/98 part f installation this part of the manual is divided into the sections listed below. These sections give a brief description of the basic rack mounting and wiring procedures for the t865 receiver, t867 exciter and t869 power amplifier. Section title pa...

  • Page 264

    Fii m860-00-preliminary 30/06/98 copyright tel 3.1 3.2 3.3 3.4 t800-45-0001 pa guide kit t869 chassis connectors pa in latched position t869 d-range wiring - rear view 3.1 3.1 3.1 3.1 figure title page.