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Zenith H27G48S Service Manual

Manual is about: Service Manual

Summary of H27G48S

  • Page 1

    Service manual service manual product type: chassis: manual part #: model line: product year: model series: contents general information/remote controls................................ Installer’s menu ............................................................ Servicing/trobleshooting ...............

  • Page 2

    Product safety servicing guidelines for audio-video products 3828vd0171g i digital fcs - safety important safety notice this manual was prepared for use only by prop- erly trained audio-visual service technicians. When servicing this product, under no circum- stances should the original design be mo...

  • Page 3

    Product safety servicing guidelines for audio-video products 3828vd0171g ii digital fcs - safety x-radiation to prevent possible exposure to x-radiation caused by excessive cpt anode voltage, the digital fcs chassis incorporate a ¨high voltage shutdown¨ circuit. This circuit senses the level of a sh...

  • Page 4: Installer Menu

    Installer menu 3828vd0171g 2-1 digital fcs - installer menu installer menu use the installer menu to set up or change op- erational settings. See descriptions of the in- staller items on the following pages. Accessing the installer’s menu installer’s menu items can be accessed by using the optional ...

  • Page 5: Installer Menu

    Installer menu 3828vd0171g 2-2 digital fcs - installer menu 7-i. Start volume this function allows the installer to determine the initial volume select that volume level when it is turned on. The range of values are 0 - 63, 255. If 255 is selected, the current volume level will be retained in memory...

  • Page 6: Installer Menu

    Installer menu 3828vd0171g 2-3 digital fcs - installer menu note: if set to 0, auto program is locked; (as shown on setup menu) channel search is not avail- able. 29-i. Old ocv (on command videotm) set to 1 for operation with systems from on command corporation. 30-i. Ack mask m.P.I. Communication p...

  • Page 7: Installer Menu

    Installer menu 3828vd0171g 2-4 digital fcs - installer menu 58-i. For. Audio. Col. (audio menu foreground color) set according to color chart. 0 = black 3 = yellow 6 = cyan 1 = red 4 = blue 7 = white 2 = green 5 = violet 59-i. Bck. Audio. Col. (audio menu background color) set according to color cha...

  • Page 8: Installer Menu

    Installer menu 3828vd0171g 2-5 digital fcs - installer menu 80-i. Upn msb-2 user programmable number, most significant byte- 2 readable by m.P.I. Command. (sn-high) 81-i. Upn lsb user programmable number, least significant byte readable by m.P.I. Command. (sn-low) 82-i. Chksm error enforces rigid m....

  • Page 9: Factory Menu

    Factory menu 3828vd0171g 2-6 digital fcs - factory menu detailed descriptions of factory menu items 000-f fact menu: use the select key to select item #00, which is the first item in the factory’s menu. The factory mode item should always be left off (zero is off). When the factory mode is on, the f...

  • Page 10: Factory Menu

    Factory menu 3828vd0171g 2-7 digital fcs - factory menu 020-f gdrive g channel drive gain control. Range: 0- 63, 0h = -4.2 db, 29h = 0 db, 3fh = +2.1 db. Fixed value. 021-f bdrive b channel drive gain control. Range: 0- 63, 0h = -4.2 db, 29h = 0 db, 3fh = +2.1 db. Fixed value. 022-f rcutoff r channe...

  • Page 11: Factory Menu

    Factory menu 3828vd0171g 2-8 digital fcs- factory menu 054-f shpf0: sharpness fo setting. 3= 3mhz @ normal mode 055-f blkoff: blanking on/off sw when akboff=1 default value is 0. 056-f clpphase: internal clamp phase pulse con- trol. Default value is 0 (+5%). 057-f clpshift: internal clamp pulse star...

  • Page 12: Factory Menu

    Factory menu 3828vd0171g 2-9 digital fcs - factory menu 094-f afc_comp: hv fluctuation compensation amount setting for h position. Range: 0-7, ini- tial value: 0. 095-f apc-mode 096-f sync-phase 097-f rst-sw ntsc: ic cxa2151 098-f hsmask: sets whether or not to add hsync within vsync at selhout. 1= ...

  • Page 13: Factory Menu

    Factory menu 3828vd0171g 2-10 digital fcs- factory menu 138-f readm: read mode master channel. 0=read- ings a and b fields. 139-f rdposym: vertical read position. 140-f rshiftm: raster shift master. 1=enable. 141-f nronm: temporal noise reduction. 1= en- abled. 142-f tnrnr4ym: temporal noise reducti...

  • Page 14: Factory Menu

    Factory menu 3828vd0171g 2-11 digital fcs - factory menu 181-f gcmon: progressive picture improvement. 0=off. 182-f hsppl: h sync shift. Default value is 0 183-f vslpf: v sync shift.Default value is 0 184-f cvsel1: output select for cvbs2. 185-f cvsel2: output select for cvbs4 or y. 186-f clmpsig1: ...

  • Page 15: Factory Menu

    Factory menu 3828vd0171g 2-12 digital fcs - factory menu 227-f r-cutoff ntsc: red cutoff control is used to adjust cut-off voltage at the cathode. Range: 0-255d. 228-f g-cutoff ntsc: greencutoff control is used to adjust cut-off voltage at the cathode. Range: 0-255d. 229-f b-cutoff ntsc: blue cutoff...

  • Page 16: Factory Menu

    Factory menu 3828vd0171g 2-13 digital fcs - factory menu 020-f pin_amp offset 021-f up_cpin offset 022-f lo_cpin offset svga 023-f up-blk 024-f lo-blk 025-f afc_bow: vertical line bow adjustment. Range: 0-63, initial value: 31. 026-f afc_angle: vertical line slope adjustment. Range: 0-63, initial va...

  • Page 17: Factory Menu

    Factory menu 3828vd0171g 2-14 digital fcs - factory menu 060-f ac blk lev svga: black level for ac cou- pling with 3bit dac. Default value is 0. 061-f bri svga: default value is 1 (internal brightness control without grey scale tracking). 062-f depth pb svga: produces an ultra black level during bla...

  • Page 18: Factory Menu

    Factory menu 3828vd0171g 2-15 digital fcs - factory menu 099-f r-cutoff y prpb: red cutoff control is used to adjust cut-off voltage at the cathode. Range: 0-255d. 100-f g-cutoff y prpb: greencutoff control is used to adjust cut-off voltage at the cathode. Range: 0-255d. 101-f b-cutoff y prpb: blue ...

  • Page 19: Circuit Overview

    Circuit overview 3828vd0171g 3-1 digital fcs - circuit overview basic circuit theory power supply definition the power supply uses a cold chassis and is a single sided circuit board that has been developed for screen sizes 27" through 32". The power supply fea- tures two switch mode power regulators...

  • Page 20: Circuit Overview

    Circuit overview 3828vd0171g 3-2 digital fcs - circuit overview when qx3204 is turned off some of this energy is returned to charge the s- capacitor(s) cx3209, cx3208, and cx3210. After several cycles (repeating at scan- ning frequency) sufficient voltage ap- pears across the s-capacitor providing a...

  • Page 21: Servicing

    Servicing 3828vd0171g 3-3 digital fcs - servicing purity adjustment 1. Purity tab positioning. Set the 2 pole purity tabs together in the 3 or 9 o’clock positions and the 4- and 6-pole purity tabs together in the 12 or 6 o’clock positions. 2. Move yoke to the maximum forward funnel position. 3. Next...

  • Page 22: Servicing

    Servicing 3828vd0171g 3-4 digital fcs - servicing horizontal-tilt wedge adjust- ment the vertical lines at 3 o’clock and 9 o’clock are converged by horizontally tilting the yoke and inserting a wedge. Adjust first at 4 or 8 o’clock, which- ever has the larger space, until the wedge is firmly seated ...

  • Page 23: Servicing

    Servicing 3828vd0171g 3-5 digital fcs - servicing video output amp ic ic5121, ic5141 and ic5161 consists of one monolithic video output amplifier. I t i s c a l l e d a t r a n s a d m i t t a n c e - transimpedance amplifier because it can be split into two amplifier stages in series. The first sta...

  • Page 24: Servicing

    Servicing 3828vd0171g 3-6 digital fcs - servicing signals three types of signals, atsc, ntsc and svga, are processed in the set. The atsc signals are down converted to ntsc signals and it are processed as com- posite video signals. The input pin, of the a/v switch is the pin 15. •cv rf: the if secti...

  • Page 25: Servicing

    Servicing 3828vd0171g 3-7 digital fcs - servicing in the output stage the nominal input signal will be amplified to provide a 4.6v output color signal at maximum contrast and maximum gain settings. Reference or pedestal black levels are adjusted by output clamping (pin 11 hfb). In order to achieve f...

  • Page 26: Model Parts

    Model parts 3828vd0171g 4-1 digital fcs-49 series model parts part number description 0cb10212474 capacitor,film,dip 0cc0800k115 capacitor,ceramic,radial 0cc100ck41a capacitor,ceramic,chip 0cc101ck41a capacitor,ceramic,chip 0cc101dr41a capacitor,unclassified 0cc1020k405 capacitor,unclassified 0cc102...

  • Page 27: Model Parts

    Model parts 3828vd0171g 4-2 digital fcs-49 series model parts part number description 0dz910009aj diode,zener 0fs5001b51d fuse, time delay 0ial241610b ic, atmel 0ial242561b ic, eeprom 0ictmfa001a ic, voltage regulator 0ictmmi060a ic,video processors 0ifa753307a ic, voltage detector 0ike358000a ic, o...

  • Page 28: Model Parts

    Model parts 3828vd0171g 4-3 digital fcs-49 series model parts part number description 0rn6201f409 resistor,metal film 0rn6801f409 resistor,metal film 0rn7501g409 resistor,metal film 0rrzvta001b resistor,array 0rs0101h609 resistor,metal oxide film 0rs0101k607 resistor,metal oxide film 0rs0121k607 res...

  • Page 29: Model Parts

    Model parts 3828vd0171g 4-4 digital fcs-49 series model parts part number description 6200c000028 filter,unclassified 6201v00002a filtes assembly 6204b62705a oscillator, crystal 6210tce001a filter, bead 6210vh0001a filter,ferrite core 6212aa2984b crystal 6212aa2988a resonator, crystal 6212ab3004d re...

  • Page 30: Model Parts

    Model parts 3828vd0171g 4-5 digital fcs-49 series model parts part number description 0ck47101515 capacitor,ceramic,radial 0ck56101515 capacitor,ceramic,radial 0cn1020k519 capacitor,ceramic,axial 0cn1030f679 capacitor,ceramic,axial 0cn6810k519 capacitor,ceramic,axial 0cq1032k439 capacitor,film,dip 0...

  • Page 31: Model Parts

    Model parts 3828vd0171g 4-6 digital fcs-49 series model parts part number description 0rd2200f609 resistor,carbon film 0rd2201f609 resistor,carbon film 0rd2202f609 resistor,carbon film 0rd2400h609 resistor,carbon film 0rd2701f609 resistor,carbon film 0rd2701h609 resistor,carbon film 0rd2702f609 resi...

  • Page 32: Model Parts

    Model parts 3828vd0171g 4-7 digital fcs-49 series model parts all fc models level repair only. Parts contact information is below. Voice: 1-888-3-zenith fax: 1-888-6-zenith mail: zenith national parts 201 james record road huntsville, al 35824-1513 part number description 181-120k capacitor,ceramic,...

  • Page 36

    1 2 3 5 4 6 7 8 mbr3447c 6710v00121a (124-00233-04) h27g48s exploded view 5-1 3828vd0171e fcs 48 series sheet 1 1 2 3 4 5 6 7 8 9 10 r e f d e s c r ip t io n h27g 48s 1 c a b in e t a s s e m b l y 3091v 00b 78g 2 s p e a k e r , f u l l r a n g e 6400v a 0025b 3 c h a s s is a s s e m b l y k e y ...

  • Page 37

    1 2 3 5 4 6 7 8 ref description h32g48s 1 cabinet assembly 3091v00496k 2 speaker, fullrange 6400va0025b 3 chassis assembly keyboard 3141vsnc61h 4 window 3790v00703a 5 cpt assembly (crt) 6335v34006a 6 back cover assembly 3809v00343e 7 chassis assembly main/smps 3141vfn003c 8 remote controller 6710v00...

  • Page 38

    Diagram interconnect circuit 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-1 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 ser...

  • Page 39

    Av switch 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-2 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 2 a ux- r...

  • Page 40

    Video processor 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-3 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 3 u...

  • Page 41

    Video sync processor 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-4 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series shee...

  • Page 42

    Rgb switcher 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-5 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 5 c on...

  • Page 43

    Scan converter 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-6 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 6 sd...

  • Page 44

    Tilt circuit 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-7 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 7 t ti...

  • Page 45

    Tuner 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-8 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 8 sda 2 sc l2...

  • Page 46

    Audio processor 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-9 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 9 a...

  • Page 47

    Microcontroller 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-10 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 10...

  • Page 48

    Power supply 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-11 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 11 po...

  • Page 49

    Horizontal & vertical deflection 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-12 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 4...

  • Page 50

    Ac input 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-13 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 13 deg- c...

  • Page 51

    Switched pws 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-14 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 14 pw...

  • Page 52

    Standby pws 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-15 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 15 deg...

  • Page 53

    Mpi 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-16 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 16 + 5 vsb f +...

  • Page 54

    Rgb card circuit 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-17 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 1...

  • Page 55

    Rgb preamp 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-18 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 18 b - ...

  • Page 56

    Edge connector 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-19 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 19 ...

  • Page 57

    Video output 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-20 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 20 r-...

  • Page 58

    8 6 3 2 5 4 10 7 12 1 15 11 14 13 9 cn1 6630gl00515 4 5 6 7 v e r t -f r o n t + 5 v h o r z -f r o n t r -f r o n t g -f r o n t b -f r o n t 1 2 3 4 5 8 7 6 9 1 0 1 1 1 2 cn2f6 366-921l 1 v id e o -f r o n t -i n c a m p o r t -s e n s e c o m p u t e r -s e n s e l -f r o n t -i n r -f r o n t -i...

  • Page 59

    Keyboard circuit 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-22 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 2...

  • Page 60

    Ir led circuit 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-23 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 23 ...

  • Page 61

    Small signal bottom 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-24 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series shee...

  • Page 62

    Small signal top 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-25 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 2...

  • Page 63

    Large signal top 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-26 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 2...

  • Page 64

    One panel bottom 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-27 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 2...

  • Page 65

    One panel top 1 2 3 4 5 6 7 8 9 10 g d c b e f a 6-28 critical safety components are identified by the letter “x” in their components designators. Replace only with part numbers specified. All components with “m” in the designator are a surface mounted component. 3828vd0171e fcs 48 series sheet 28 c...

  • Page 66

    Z e n i t h.