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- Operating And Service Manual
Tandon TM848-1 Operating And Service Manual
Summary of TM848-1
Page 1
Oem operating and service manual tm848-1 and tm848-2 disk drives 48 tracks per inch m n d u n co rpo ratidn 20320 prairie street chatsworth, ca 91311 telephone no.: ( 2 1 3 ) 99 3 -6644 twx no.: 9 1 0 49 4 1 721 t el.Ex no.: 1 9 4 7 9 4 copyright 1982 tandon co r p o r a tion.
Page 2
The information contained in this document is the property of tandon corporation. It may not be duplicated in full or part by any person without prior written approval. The material in this document is provided for informational purposes, and is subject to change by tandon corporation..
Page 3
T able of co n t e n t s section number page number title of section sect ion i int r o d u c t ion to the tm848 family of disk drives l. 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.10.1 1.1 0.2 1.1 0.3 1.11 1.12 1.13 1.14 1.15 1.1 5.1 1.1 5.2 1.1 5.3 1.1 5.4 1.1 5.5 1.1 6 1.1 6.1 1.1 6.2 1.17 1.1 7....
Page 4
Section number 1.1 9.1 8 1.1 9.1 9 1.1 9.20 1.1 9.21 1.1 9.22 s ect ion ii m a i n t e n a n c e c h e c k s a n d a d j u s t m e n t s page number 1-21 1-21 1-22 1-22 1-22 title of section inhibit write when write protected allow write when write protected . Head side select options s1 - s3 spindl...
Page 5
Section number page number title of section activity l. E. D load arm assembly. Track 00 sensor assembly. Write protect sensor assembly door switch assembly index sensor assembly. D iskette ejector assembly . Load resistor assembly stepper band . Stepper motor assembly head carriage assembly 5.8 5.9...
Page 6: List Of Illustrations
List of illustrations figures figure number page number 5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 5-9 1-1 1-2 1-3 1-4 1-5 1-6 1-7 1-8 1-9 1-10 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-1 1 2-1 2 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-1 0 3-1 1 3-1 2 title of figure tm848 disk drive mounting configuration. Tm8...
Page 7
Figures figure number 5-1 0 5-1 'i 5-1 2 5-1 3 5-14 5-1 5 5-1 6 5-1 7 page number 5-8 .. 5-9 .. 5-10 5-1 1 5-1 2 .. 5-13 5-1 3 . 5-14 5 5-1 8 et f i e r e t i t l e bezel and related parts activity l. E. D. Key parts load arm assembly key parts track 00 sensor assembly key parts write protect sensor...
Page 8: Section I
Section i intro d u c t io n to th e t m 8 4 8 f a m ily of disk drives i ntro d u c t i o n this section contains a description of the physical and functional specifications for the tm848-1 and- 2 disk drives, 48 tracks per inch (tpi), manufactured by tandon corporation. 1.1 purpo s e o f th e driv...
Page 9
The head is positioned over the desired track by means of a stepper motor/band assembly and its associated electronics. This positioner employs a 3.6 degree rotation to cause a one-track linear movement. When a write-protected diskette is inserted into the drive, the write protect sensor disables th...
Page 10
Table 1-1 me c h a n ical and elec trical specifications mechanical h eight: 2 . 3 0 i n c h e s w idth: 8 in c h e s length: 1 3 . 12 5 i nches behind front panel weight: 5. 5 p o u nds electrical + 5 v d. C. Power: +24 v d. C. Power: selected motor on: dese lected: spindle motor: start current sur...
Page 11
Table 1-2 power requirements 1 . + 5 v o l t s : 2. + 2 4 v o l ts: after motor start interval 0.70 amps typical spindle moto r 0 .3 5 a m p s t y p ical stepper moto r 0.4 0 a m p s t y p ical electronics 0.17 amps typical total 0.92 amps typical 3. + 2 4 v o l ts: d u ring motor start interval a. ...
Page 12
A. Inspect the shipping package for obvious damage. B. Open the shipping container, and remove the drive. C. Inspect the drive's overall appearance. Ensure that there are no scratches on the bezel. D. Ensure that all internal connectors are seated properly. E. Turn the diskette lever counterclockwis...
Page 13
0o 6-32 thd thrli 4 pl (2 ea. Side) 0 8.00 13.33 3.50 0 '0 149 dia. Top x 1 56 dia. Bottom x .430 dp. 4 pl o .P 3 pp i 20 6 ~ i 8 550 1 60 2.300 notes. D imensions given in inches. Figure 1-1 tm848 disk drive mounting configuration 1.10.1 h a rdw a r e the drive is manufactured with certain critical...
Page 14
The following list contains information on how the diskette can be cared for, handled, and stored. 1. Keep the diskette away from magnetic fields. 2. Do not to uch the precision surface of the diskette with fingers. 3. Insert the diskette carefully into the drive until the backstop is encountered. 4...
Page 15
3. Spindle drive control 4. Carriage position control 5. Write/erase control 6. Read amplifier and digitizer figure 1-2 is a functional block diagram of the drive. It should be referred to in conjunction with the following sections. The data in the ensuing figures is primarily represented in simplif...
Page 16
1.15.3 sp in d l e d r ive system the spindle drive system consists of a spindle assembly driven through a drive belt by a brushless d.C. Motor/tachometer. The servo electronics required for speed control are located on the printed circuit board. The control circuitry contains an interface control l...
Page 17
B it pattern~ bit c e l l p+ ) 0 1 0 i i i i c )d c i ) i i i i i ) ) ) ) ) 0 i i i i 1 i i ) i ) magnetization write data d / c i i i i d i c i c i c i i d c i i i i i i i i magnetic elements n s s n n s s s s n n s s i i ) i i i i ) ) i i i • i ) i s i ) i i figure 1-3 fm recording magnetization p...
Page 18
The trim erase control goes true 190 microseconds after the write enable interface line since the trim erase gaps are behind the read/write gap. It should be noted that this value is optimized between the requirements at track 00 and at track 76, so that the effect of the trim erase gaps on previous...
Page 19
The output signal from the read/write head is amplified by a read preamplifier and filtered by a low- pass linear phase filter to remove noise (see figure 1-5). The linear output from the filter is passed to the differentiator, which generates a wave form whose zero crossovers correspond to the peak...
Page 20
Table 1-3 i n te r fac e co n n ecto r p i n ass i g nm e n t s ground pin number 1 3 5 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 ~ si nal write current switch motor off control 1 motor off control 2 motor off control 3 two sided (option) (model tm848-2 only) disk change...
Page 21
Table 1-4 p ow e r c o n n e c t o r pin assign m e n t s s u i vo l t a e 24v d. C. Return return return 5v d. C. Pin 1.17 term in a t e d l in es 1.17.1 inp u t l i n e terminations from removable resistor pack the drive has the capability of terminating the following input lines: 1. Write current...
Page 22
P7 tp2 2s oo m3 om4 tp1 00 rl p4 00 d s ' i tp3 0 0 0 0 0 1b 0 00 ds2 2bo oo ds3 u3 p5 3b o 4b 0 oo ds4 0 0 rm mc3 tp5 00 00 q (0 iz 0 tp4 pt6 mc200$ mc1 0 0 c mc4 0 s2 0 o s 1 d o 32 np oo y alternate test point index triggering rpi o~ qas2 r133 dsi wp tp11 0 0 t p 1 2 ml g p13 50 tp 7 0 0 tps o od...
Page 23
D.C. Power motor off drive select 500 nsec. Minimum 0.8 sec maximum outputs valid 500 nsec'minimum direction select 1 usec. Minimum 1 usec minimum step 1 usec. M i nl mum 3 milliseconds minimum side select 100 nsec minimum write gate 4 usec. Maximum write data 18 msec. Minimum vali read data 100 use...
Page 24
1.18 d s a n d h l p o w e r s a ve o ptions the drive is set upwith the hl option in. This stepper power from head load line option supplies power to the stepper motor when the head load line goes low (true), which results in lower stand-by current consumption. As shipped from the factory, hl is in...
Page 25
1.19.1 dri v e s e l ect ds1-ds4 this option allows the user to daisy chain up to four drives, and to enable one drive at at time. Drive select is implemented by shorting one of the four connections, using a shorting plug. The drive comes equipped from the factory with ds1 installed. All outputs are...
Page 26
Dredv + program shunt pins 7-10 are opened r14 4 7 r4 i 05 44 4 .. 4 iiea ay ~e i side 1- in1 ff+ iready- drsel -i l'502, oa 4 laok i ua i/i' tl ii %5v r99 150 rr m 2~ etch cut ra7ilk ~read status to user controller i xm cc figure 1-8 radial ready installation note mc1 through mc4 cannot be used as ...
Page 27
+5 v program shunt pins 6-10 are opened drsel + index + ri5 4.7 l4 5 4 v4 ri +5v r99 iso /ii l~ i q ~ m c '5 ~ i~ radial index status to user controller + c4 figure 1-9 radial index installation 1.19.9 in de x a l t e r nate output pad (i) the internal index pulse is gated with drive select to give ...
Page 28
1.19.14 st epper power from drive select (ds) this option allows the user to remove d. C. Power from the stepper motor using drive select, which results in lower stand-by current consumption. The stepper power from drive select option is implemented by installing ds, and cutting hl. 1.19.15 s t eppe...
Page 29
Note this option does not stop the write protect signal from being sent on the interface line. This option is implemented by cutting wp, and by installing np. 1.19.20 h ead side select options s1-83 this option allows heads to be selected by side select, drive select, or the direction control signal...
Page 30
S ection i i m aintena nce c h e cks and adjust m e n t s 2. Intr o dugti on this section is for the use of the oem repair department. It contains checks and adjustments that are used during the normal life of the drive. Before applying power to the drive or doing any checks or adjustments, visually...
Page 31
E. Set up the oscilloscope, as follows: voltage: 2 volts per division time per division: 20 milliseconds trigger: n e g a t i ve, channel a, r33 note for the tm848-1 single-sided drive, trigger off of r33. For the tm848-2 double-sided drive, trigger off of test point 12, with the exception of azimut...
Page 32
Hub center line track 0 track 38 track 76 figure 2-2 hub center line and track locations 2-3.
Page 33
2.2.1 cat s eye alignment check a. Set up an oscilloscope, as follows: channel a; channel b: test point 2 alternate is test point 4 on r30 test point 3 alternate is test point 5 on r29 test point 1 ground read differentially: a plus b, b inverted time base: external trigger: 20 milliseconds per divi...
Page 34
H. Verify that the smaller of the two cats eye lobes is not less than 75 percent in amplitude of the other one. The calculation is: am p o f smaller lobe a mp o arger o e i. Step the drive to track 00, then, step it back to track 38. J. Reverify the cats eye pattern. K. Step the drive to track 76; t...
Page 35
E. Reverify the cats eye alignment (see section 2.2.1). 2.4 i ndex s e n s o r ch ecks and adjustments the index adjustment changes the time period from the index pulse to the start of the data. The adjustment should be checked after the drive has been aligned (see section 2.1.1) or when diskette in...
Page 36
Time scale: 50 usec per division figure 2-5 index-to-data burst k. When both index measurements on a double-sided drive or the one index measurement on a single-sided drive meet the specifications, see section h, check the index-to-data burst on track 76. L. On a double-sided drive, check heads 01 a...
Page 37
B. Adjust the index sensor with a flat blade screwdriver until the index-to-data burst occurs 200 microseconds + 100 microseconds from the leading edge of the index pulse. C. Tighten the index sensor's retaining screw. D. Reverify the index-to-data bursts (see section 2.3.1). 2.4.3 index p u l s e w...
Page 38
D. Confirm the position by observing the cats eye pattern. E. Attach channel a to test point 10. F. Restore the carriage to track 00, and ensure that the track 00 l. E. D. On the exerciser turnson. G. Seek to track 1, and ensure that the signal at test point 10 is high. H. Seek to track 2, and ensur...
Page 39
C. Connect an oscilloscope to test points 4 and 5, using test point 1 as a ground. D. Set up an oscilloscope as follows: channel a: channel b: both channels: test point 4, 1 volt per division test point 5, 1 volt per division a. C. Coupled, channels a and b added, channel b inverted 50 milliseconds ...
Page 40
Note measure the azimuth burst. Ensure that burst 1 is less than or equal to burst 2, and that burst 4 is less than or equal to burst 3. 1 2 3 4 figure 2-9 optimum head azimuth a l i g n ment e. Figure 2-10 depicts an azimuth of exactly minus 9, 12, or 18 minutes, depending upon the manufacturer of ...
Page 41
3 4 figure 2-11 head azimuth alignment of acceptable upper limits note the head's azimuth is not adjustable. It is suggested that the drive be sent to an authorized repair center or a new head assembly be installed. In the latter case, all previous adjustments should be made again. 2.8 loa d a r m a...
Page 42
Section i i i p rinted circuit boar d o p e r a t i o n introdu ct ion this section contains the interface description and the circuit board theory of operations for the tm848 familyof disk drives. In addition, sections 3.1 and 3.2 contain schematic diagrams of the circuit boards installed in the dr...
Page 43
It is recommended that the interface cable be flat ribbon cable, with a characteristic impedance of 100 ohms. Interface connector pin assignments are given in table 3-1. 3.3 in p u t c o n t r o l lines a. Ds1-ds4, select lines functional description the select lines (see figure 3-3) provide a means...
Page 44
Table 3-1 • d rive interface lines and pin con n e c t o r s ground pin number 1 3 5 7 9 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 signal write current switch motor off control 1 motor off control 2 motor off control 3 two sided (strappable) (model tm848-2 only) disk cha...
Page 45
Functional description the tm848 has a d. C. Brushless motor that can be enabled in three ways: 1. By using the four radial motor control lines, mc1 through mc4. 2. By the head load line using shorting plug m4. Using this line enables all drives' motor on lines. 3. By drive select, using shorting pl...
Page 46
Circuit description the direction line comes in on pin 34 of the interface connector. A high signal directs the step logic to step toward track 00. A low signal directs the step logic to step toward a higher numbered track. The direction line sets the proper phase to the exclusive or gates of u9. Ta...
Page 47
Inverted and gated with write protect and drive select to enable u23, u30, and q13. Transistors q13 and q12 are write current switches. Q13 and q12 are on in parallel when the low write current interface is high (false). This results in a write current of 10 milliamps. When the low write current lin...
Page 48
Circuit description data is sent to the drive via interface pin 38. This signal is inverted by u22, and is used to clock the d flip flop u23. The outputs of u23 are inverted subsequently, and used to drive q15 and q17, which direct the write current to the correct winding. F. Trim erase functional d...
Page 49
Wrt gate 4us max. Wrt data wrt tran + (~ iso u30, pin 12 sec a, q output 550us u30, pin 13 sec b, q output u31, pin3 trim erase source figure 3-5 trim erase diagram.
Page 50
+svk (sii 4 ) + izv + 12v cr'is +sy +5v iso r4 ib +5v i ok rb d si z i o dsi 4 ls04 ui ls04 ii f"t susv+ rlol s90 zki4 125 q ilo ds2 2s qss >0 ds2, 740co ls04 2, u74 r&4 750 zn4125 qis zb oss c7 g 4.7jcj' zkl4 izs q19 sb ds4 ct i d s4 s z +sv 12 4b v l 12 0 i lsoo ii i 2 lsi 4 i i 10 lso4 side i b i...
Page 51
3.4 o u tp u t c o n t r o l lines a. Index/sector functional description the index signal is provided once cash revolution (166.667 milliseconds nominal) to indicate the beginning of a track to the controller. The index line remains in a low(true) state for the duration of the index pulse. The dura...
Page 52
Circuit description the disk change flip-flop, u10, is reset by open- whenever the lever is in the open position. When this occurs, u10-6 is high, and a true disk change status is sent to the interface on pin 12 from u4-11. Flip- flop u10 is set on the trailing edge of drive select causing u10-6 to ...
Page 53
P2 1 rs4 trs ck ~~ +av 8 l.E.O +sy trio s il u l l 2 io io 23 3 ~4 2 7 4 4ek glt3 ~ c k 4enf30r. Rp4 4 7 k . 35 i lias 33 i us2 ii @ps 22k t'22ll~f v "po 2, rp3 470 k. 22k. Rp2 figure 3-9 track 00 schematic diagram circuit description when the read/write carriage is restored to track 00, a tab on th...
Page 54
Tp7 p 3 drivel+ 5 +~" write protect l.E.D. I u 2 u29 36 igo write protect wrprot- write+ '2 05v + v 5 rp4 4.7k, protect senmr i m'539 v3? Rp2 22lc. S zzk 4 7 o kr rp2 rp3 figure 3-10 write protect schematic diagram test points 2 and 3 (see figure 3-11) are provided to observe the differential output...
Page 55
Test point 2 upper head read and head switching circuits signal amplifier test point 3 lower head test point 4 time domain differentiator crossover detector filter test point s data output digitizer int wrt busy unit select figure 3-11 read circuit block diagram circuit description when a two-sided ...
Page 56
4i2v r135 10 n +izv i t p i t p 5 l3 39/3ui 412 v i k. T p4 t p c, cr15 r21 is k. Czar luf r2 zzo i% cia c opl c15 ci5 47yf lk i33 ro i k i 93 r9 ip 14 v2 592 ii 4 rio 1.2k 0.47y/ f ik o.'i'i rz7 i k. 2/3 / 07 59 22.2 ik i i 330/9 cil 4'7y f rd2 cr14 r.I57 sppn lz. R7 ik ciz pyl tp2 c i 0 047yf ik r...
Page 57: Troublesh O O Ting Guide
Section iv troublesh o o ting guide i ntro d u c t i o n this section is presented in the form of a table. Each section contains four major parts: 1. The section number. 2. A statement of the presenting condition. 3. A list of the possible causes of the condition. 4. I he recommended action to be ta...
Page 58
Possible cause rec o m m e n d e d a c t ion s ectio n co ndit i o n 4.1 not ready and/or no index diskette not inserted. Diskette not clamped. Unit not selected. Insert diskette. Turn knob lock lever clockwise so that it is perpendicular to the diskette insertion slot. Verify unit select and jumper...
Page 59
S ectio n co ndi t i o n possible cause rec o m m e n d e d a c t io n 4.3 will not writ e inte r f a c e not e nabled. Verify write enable, select, and write data interface lines. Heads or write protect switch not connected. Check connectors p3, p8, and p9. Write protect switch misadjusted. Defecti...
Page 60
S ection co ndi t i o n possible cause rec o m m e n d e d a c t io n 4.5 activity l. E. D. I nop e rat i ve check p11 activity l.E.D. Not connected. Replace activity l. E. D. Assembly. Replace circuit board. Activity l.E.D. Defective. Activity l.E.D. Driver defective. 4.6 no track 00 sensor i n d i...
Page 61: Section V
Section v replaceivient procedures 5 i nt ro d u c t i o n this section contains the replacement procedures for the tm848 family of disk drives' parts and assemblies: 1. Drive belt 2. Drive motor 3. Circuit board 4. Cone assembly 5. Diskette lever 6. Bridge assembly 7. Front panel 8. Activity l. E. ...
Page 62
Drive belt small flanged spindle pulley 0 0 0 oe large spindle pulley figure 5-1 drive belt and spindle b. Grasp the drive belt, and remove it from the pulleys. 5 .1.2 i nst a l l a t i o n a. With the shiny side inward, loop the new drive belt onto the small, flanged spindle pulley. B. While turnin...
Page 63
P6 0 p drive motor oo 0o mo u nting screw s (3 places) tie wraps (12 places) drive motor wires figure 5-2 drive motor and related parts c. Carefully rebundle the wires, including the drive motor wire, and cable harness them (see figure 5-2). D. Plug p6 into the circuit board. E. Turn the drive over,...
Page 64
Mounting screws connecting heat sinks power connector retaining clip screw 04 0 qo 4 figure 5-3 circuit board mounting screws b. Remount the circuit board using the two screws to the two heat sinks and the screw and nylon clip that attach the circuit board to the drive's chassis. C. Plug in all conn...
Page 65
Cone bracket screw cone alignment arm e-ring a washer wave washer diskette lever 0 p qo cone assy figure 5-4 cone assembly key parts d. Latch the diskette lever. E. Insert the screw that attaches the cone bracket to the cone alignment arm(see figure 5-5). E-ring flat washer wave washer cone bracket ...
Page 66
5.5 dis ket t e l e ver 5 .5.1 re mov a l a. Pry off the cover that hides the diskette lever's retaining screw (see figure 5-6). Shaft mounting screw cover diskette lever figure 5-6 diskette lever key parts b. Remove the diskette lever's retaining screw. C. Carefully remove the diskette lever. 5 .5....
Page 67
Bezel mo u nting screws, 2 bezel ~ diske t t e lever 0 p qo bezel mo u n tng screws. 2 figure 5-7 diskette lever adjustment bridge mounting screw s 2 both sides 0o o o bezel screws 2 both sides 0 0 figure 5-8 bridge assembly key parts d. Carefully pull out the two index l. E. D.'s in the bridge asse...
Page 68
Mounting screws (2 ea side) bridge assy q4 index l.E.D.'s (2) 4 o 4 p p ~d i s k ette lever 4 p q4 0o shaft figure 5-9 mo u nting screws (2 ea side) bridge assembly additional key parts bezel 5.7 5.7.1 r emov a l a. Remove the diskette lever (see section 5.5). B . Remove the f our b e zel mo u nting...
Page 69
5 .7.2 ins ta l l a t i o n a. Put the bezel on the drive, ensuring that the activity l. E. D. Goes into its holder. B. Install the four bezel mounting screws that attach the bezel to the chassis. 5.7.3 c hec ks a. Ensure that the activity l. E. D. Goes on when required. B. Ensure that the diskette ...
Page 70
5 .9 loa d a r m a s s e m b l y 5.9.1 r emov a l a. Remove the circuit board (see section 5.3.1). B. Remove the mounting screw and washer that are used to attach the load arm assembly to the chassis (see figure 5-12). 0+ llfllflfliiijiiii 0 0 po load arm rear mo u n ting screw, washer, and spring f...
Page 71
Track 00 sensor assembly mo u nting screws 2 0 . 0 + p s p i p2 bracket qo 0o tie wraps figure 5-13 track 00 sensor assembly key parts c. Remove the p2 wires from the bracket attached to the chassis. D. Remove the two mounting screws that hold down the track 00 sensor assembly. E. Lift off the track...
Page 72
Mounting screws (2) ' $ . . $ p2 p3 p i oo 0o write protect sensor assy. Figure 5-14 write protect sensor assembly key parts 5.11.2 ins t a l l a t ion a. Using the two original mounting screws, attach the write protect sensor assembly to the chassis. B. Plug p3 into the circuit board. C. Tie wrap t...
Page 73
5.13 i ndex s e n s o r assembly mo u nting screw p14 p 8 • ~ 0 + p 3 p i pz qo 0o d oor switch assem b l y figure 5-15 door switch assembly key parts 5 .13.1 re mo v a l a. Remove the circuit board (see section 5.3.1). B. Gently remove the two index l. E. D. 's from the bridge assembly (see figure ...
Page 74
E. Cut the tie wraps along the cable harness (see figure 5-16). F. Lift out the index sensor assembly (p1). Tie brackets, 2 far side tie bracket, i near side 0 0 0 0 0 0 l ower index sensor assem b l y (60i mounting screw q atoll i @ 0 figure 5-17 index sensor assembly key parts, bottom view 5.13.2 ...
Page 75
Trigger hold down screw ejector iiiiiii iiiii iii ii pivot bar ejector spring t rigger assem b l y figure 5-18 diskette ejector assembly key parts d. Lift up the bridge assembly approximately two inches, taking care not to pull the l. E. D.'s from their sockets. E. Release the spring attached to the...
Page 76
5.1 5.1 re m oval a. Remove p5 from the circuit board. B. Remove the circuit board (see section 5.3.1). C. Remove the two mo u nting screws that attach the load resistor assembly to the chassis. D. Unsolder the wires to the load resistors (see figure 5-19). E. Mark or identify these wires so that th...
Page 77
5 .16 ste pp e r b a n d 5 .16.1 re mo v a l it is suggested that the drive be returned to an authorized tandon repair center when removing the stepper band. A. Remove the circuit board (see section 5.3.1). B. Lift off the stepper band from the spring tensioner (see figure 5-20). S crew, attaches ba...
Page 78
Mo u nting screws, 3 places stepper motor assembly 0 4 o q qo 0 o qo 0 0 (> 0 figure 5-21 stepper band additional key parts 5.17 stepp e r m o tor assembly 5 .17.1 re m o v a l it is suggested that the drive be returned to an authorized tandon repair center when removing the stepper motor assembly. ...
Page 79
Stepper motor assemb ly mo u n ting screws, 3 places p+ o q qo p b • • ~ 0 0 ' .Ig ~o 0 0 o 0 qo 0 figure 5-22 stepper motor assembly key parts c. Replace the stepper band (see section 5.16.2). D. Replace the circuit board (see section 5.3.2). 5.17.3 c hec k s a. Align the c. E. Lobes on the drive (...
Page 80
0 0 0 0 oo qo 0o mounting screws 4 places figure 5-23 head carriage removal f. Lift out the head carriage assembly. 5.18.2 i ns t a l l a t ion a. Install the carriage shaft in the carriage. B. Using the four original mounting screws, attach the carriage shaft to the chassis. C. Install the stepper ...
Page 81
Appendix i p rinted circuit boa r d s c h e m a t i c s an d a s s e m b l y d r a w i n g s.
Page 82
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Page 83
3 r evis i o n s description seiz. Sh l +izv + 12v rbg 1.54 k. I vo rs4 4 7 k +5v rsb r iob r 5 5 7/ob 7/ob z. 2 ko /ss rg0 z.2k. +5v 8 avr / 10 9 isc3 0 q uzo ogf ii 4 10 12 ziv4124 gl/5 zn4/24 q/7 74 rirt data sb q clr is oco r51 r52 953 i to r4b 3.9k cr l7 2n4124 c3ab 2/vof/24 q/2 ueao c(mme(oif'...
Page 84
3 r evisi o n s d escript i o n e m.If $8 '\ r i 412y rpj5 10 ez +iz.V 19 t p4 t d c . +12 v i r29 ik i'k c i5 'ik i% r9 14 u2 7 10 i 592 12 ik r.I i r27 i k. +12.V c2& • im rzio is y cfog cl5 cr15 zof ik i'/o r6' ri0 i.Zk. U7 592 ii r22 ik ito 950r' ci& r26 ik cri4 at f cld izoz 12 lz. R7 ik di + c...
Page 86
R evisi o n s d escript i o n !I2y 2. Spindle speed adjustment r133 5k. Ri23 zd k. + !12 vl (sh 4) l5 +12v 2 + c59 o.4u f c54 0.02z/ff look r.127 cw + c55 ip~ f d rl z5 47k p' 7" lids i n15/970 * speed cgpli7 rot (sip pack/ — cs3 0.022~f 12v 7 5 d15kftte loaded ( 5witcfi dpen dl pi4 +5v reo i i w. I...
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Cl pl 100000 5!9096-000 rbv ( p p o . O !D o , 7 - ~ 2 $ ~ e, rr ~~ !5« r i • ' 55 ,' ',! ', ;i gj ,! 4 ,.Pj ,.„"-'"' ~ d»im ~ j «g . Do 5 0 «0»»'a'»' rr ," » 50 p»5»r 5 ~ 1» » « » 0 i ! » l dm"m«tm~ ~ ~ t i " ' '09 i o~9@ ov 1» @ 3c83 ~ ' f30 ' ill i 1», • '»m«m« ~ , ,"-~ »m d ~ . ~ r109 «2 0 054 (...
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Appendix ii rec o m m e n d e d s p a r e p a r t s list.
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Parts and subassem b li es part number part drive belt drive motor circuit board cone assembly diskette lever bridge assembly bezel activity l. E. D. (front panel) load arm assembly track 00 sensor assembly write protect sensor assembly door open switch assembly index sensor assembly diskette ejecto...
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Pi n 1 79031-001 (1 082).