Panasonic JU-455-5 Service Manual Download Page 1 | Manualshive

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Summary of Contents for JU-455-5

Page 1: ...v1ce Panasonic ORDER NO MSD850902900 anua Flexible Disk Storage Drive JU 455 5 Matsushita Communication Industrial Co Ltd Memory Systems Division 3 1 4 chome Tsunashima Higashi Kohoku ku Yokohama 223 JAPAN ...

Page 2: ... 5 25 inch 9 1 O limiter Adjustment 3 5 inch 9 11 Asymmetry Verifications PANASONIC ALIGNMENT DISKETTE PARTll Page 1 1 2 2 2 2 3 3 3 3 3 3 4 5 5 6 7 7 7 7 8 8 10 10 11 11 11 11 12 11 REMOVALSANDINSTALLATIONS 00 00 13 11 1 PCB Removal and Installation 13 11 2 Front Plate Removal and Installation 13 11 3 Track 00 Assembly Removal and Installation 13 11 4 Collect Assembly Removal Installation and Adj...

Page 3: ...AL TOOLS s zs0inmF00 1 48TPt L JA 55X JlJ 455 LJA 550 JA 551 3 5 inch FOO JU 58X JU 581 l__JU 585 JU 59X JU 591 l__JU 595 JU 465 JU 475 67 5TPI JU 31X 1 JU 312 JU 313 JU 314 135TPI LJU 32X JU 322 L JU 323 JU 324 JU 36X 1 JU 362 JU 363 JU 364 The following special tools are used for FOO maintenance TABLE 3 1 Tool Exerciser Alignment diskette Work i ette CMOSmL adaptor Limmiter Adfust Tool S 25 inch...

Page 4: ...perating procedure wrong programming or use of a defective diskette or soft errors due to external causes such as contaminated air and random electrical noise are often attributed to a drive failure or maladjustment Unless a visual inspection of the drive reveals an evident assembly fault or adefect always confirm errors with another good diskette and another known good drive 5 2 Soft Error Detect...

Page 5: ...ck number on which the head is located and move the head away from 1t And read it again 5 6 Compatibility Error The data which is written by one drive may not be read by another This error is called a compatibility error which can be caused mostly by the following The check points are also mentioned below 1 Head misalignment Refer to Adjustments and Confirmation Item 9 5 2 Head output too low Refe...

Page 6: ...W ON Drive Select SN head load SN ON RECAL SW ON NO Media Defective Controller Defective Check Item 1 Table 6 1 Check Item 2 Table6 1 Check Item J Table6 1 Check Item 4 Table 6 1 4 Set Address SW to Track Write SWON Write SW OFF FOO online test ENO NO NO Check Item 5 Table 6 1 Check Item 6 Table 6 1 Check Item 7 TableJ 1 Check Item 8 Table 6 1 Check Item 9 Table 6 1 Check Item 1O Table 6 1 ...

Page 7: ...tor Replace 2 Guide shaft contamination or damaged Replace 3 PCB stepper driver circuit Repair 6 No WRITE 1 See Item 1 2 See Item 4 3 Head disconnected Replace 4 Head shorted Replace 5 HDL bail height wrong Adj 6 PCB write circuit Repair 7 No READ 1 See Item 1 2 See Item 4 3 See Item 6 4 PCB read circurt Repair 8 READ ERROR 1 See Item 1 2 See Item 4 3 See Item 17 4 Alignment Adi 5 Azimuth Unadjust...

Page 8: ...nd return to 0 0 0 8 Asymmetry 39 600ns 79 600ns 76 350 ns 9 Head load time SO ms Item Parameter JU 591 595 475 JU 455 465 I JU 455 5 TRK VALUE TRK Value I TRK Value 1 Index period 32 166 7 16132 200 0 2 ms 1 t6 200 0 2ms 0 2ms 200 High 0 2ms Low 2 Output level 76 120 mVor 39ng 140 120 mV 39 C 140 mVor more or more more 3 Radial Alignment 32 70 16132 70 T6 70 4 AZIMUTH 68 18 34 68 18 I 3 4 18 5 In...

Page 9: ...oved as specified in the table below Media with write protect Media with write protect hole open hole closed 5 25 inch OFF ON 3 5 inch ON OFF 9 3 Head Output Verification Use a new diskette if possible to identify head failure for this check 1 Insert a good diskette 2 Run the motor 3 Step to the track specified in the output level column of Table 8 1 4 Connect the oscilloscope probe as specified b...

Page 10: ...t an alignment diskette CAUTION Be sure to leave the alignment diskette under room conditions for 20 minutes before adjustment 2 Step to the track specified in the Radial alignment column of Table 8 1 3 Leave the oscilloscope in the same condition as mentioned in section 9 3 Cats Eye System S 25 inch 4 Check the output waveforms for sides 0 and 1 They should appear as in Fig 9 2 5 The two waveform...

Page 11: ... ratio calculated by the above formulas should meet the specifications on item 3 of Table 8 1 7 If the above requirement is not met loosen the two mounting screws for the stepper motor adjust 8 Seek from track 0 to track 40 and from track 79 to track 40 and confirm that the adjustment has been complete 9 After the radial adjustment be sure to confirm track 00 sensor adjustment 9 8 and head carriag...

Page 12: ...ification 3 S inch A CE 30 OAD 15 Fig 9 4 Azimuth Waveforms s 2s fricn AL 12 1 Insert an alignment diskette Seek to the track specified in the 1 8 column of Table 8 1 2 Set the oscilloscope time base as follows s is inch 50 µs division 3 5 inch 1 ms division 3 Check that the time from oscilloscope start to the first data pulse meets the 1 8 specifications of Table 8 1 DAD system 4 If the specifica...

Page 13: ...track 00 c If the carriage does not return to track 00 in Step b or if it contacts the limiter of the stepper motor the stepper motor assembly must be replaced because adjustment is useless 9 10 Limiter Adjustment 3 5 inch 1 Seek to track 0 2 Write 2F data on track 0 and measure read level 3 Loosen the limiter mounting screw to free the limiter 4 Move the limiter until it just touches the head car...

Page 14: ... 10 1 S 2 S ihcfrAligl1mentDiske tte TPI P N Index Azimuth Burst 34TRK 34TRK 48 8J7 l28 ___ I 68TRK 68TRK 96 817 560 68TRK 68RTRK 96 817 581 61TRK 61TRK 100 817 570 Table 10 2 3 5 inch Alignment Diskette TPI PIN Index Azimuth lurst 67 5 JU 01AA 20 20 40 40 135 JU 01AA 12 Radial MODEL 16TRK JA 55X JU 455 32TRK JA 56X JU 465 32TRK JU 475 JU 58X JU 59X 36TRK JU 570 Radial MODEL 20 JU 31 X 40 JU 32X J...

Page 15: ...J3 connector is facing upwards and J6 connector pin No matches the P C B side pin No 13 11 2 Front Plate Removal and Installation See Fig 11 2 1 Operate the lock cam of the clamp assembly and turn the clamp handle in the direction of clamping 2 Remove the clamp handle 3 Remove the two front plate mounting screws and take off the front plate 4 Reverse the above procedure to reinstall Front Plate Cl...

Page 16: ...orarily fasten the Cartridge Guide Assembly b Insert a diskette or dummy diskette and clamp it c Clamp repeatedly a few times to find a good fit between the collet and the inside diameter of the DD motor d Bind the screw of the Cartridge Guide e Check step c again if not good repeat steps a through d until the correct center adjustment is achieved Collet Assembly _ Fig 11 4 Collet Assembly Removal...

Page 17: ...te Protect Sensor Index Detector Assembly Removal 11 7 Cartridge Guide Assembly Removal and Installation See Fig 11 7 15 1 2 3 4 5 6 7 Remove the printed circuit board as described in 11 1 Remove the front plate as described in 11 2 Remove the shield plate mounting screw and take the shield plate off Remove the write protect sensor as described in 11 6 It is not necessary to remove the index detec...

Page 18: ...n in 9 8 Fig 11 8 Stepper Motor Assembly Removal 16 11 9 carriage Arm Assembly Removal and Installation See Fig 11 9 1 Remove the printed circuit board as described in11 1 2 Remove the insulating paper and shield plate 3 Remove the track 00 assembly as described in 11 3 4 Remove the stepper motor assembly as described in 11 8 5 Remove the two guide rod clamp mounting screws 6 Remove the carriage a...

Page 19: ...or 8 Reverse the above procedure to reinstall 9 When reinstalling make sure that the drive motor connector is connected in the correct direction 1 O After reinstallation perform motor speed adjustment as described in 9 1 and also the adjustments necessary upon reinstallation of the cartridge guide as described in 11 7 Drive Motor Fig 11 10 Drive Motor Removal 17 11 11 LED Assembly Removal and Inst...

Page 20: ...12 TEST POINTS Printed Circuit Board Top view GNO TPS V out V out INTTRKes TPS TP6 READ DATA STEP TP12 18 TP7 INDEX TP10 GND ...

Page 21: ...YTF4JO 1901 B4 Lift Spring 1 19 333046817500 Pat 1 20 YTU F56CLT2AN Collet Assembly 1 21 UF45CP3CAE 1 Clamp Assembly 1 22 YJF4F0034182 Clamp Bearing 1 23 YTF4H01720B3 Clamp Cam Assembly 1 24 333036817692 Lock Cam 1 25 333046624770 Lock Spring 1 26 YTU F45WP4AAA Write Protect Assembly 1 27 YTUF45LED LED Assembly 1 28 YTUFSSSM Stepper Mo _or Assembly 1 29 YTF1GOOSOOB4 Cord Clamp 1 30 YTF1E00300B4 Wa...

Page 22: ...8 1 IC p FJP00110B400 Ptug xv YJDIL814P8JC IC Socket HA1342 HA13421 LSI 1 HA1664 HA16642MP IC 2 FQLOOO FQL0008184 LSI 8 Solder Side Bottom Per Set pcs Ref No Part No Description R1 2 3 FRA000108428 Chip Resistor 1 R7 FRA000408432 Chip Resistor 3 RB FRA000408496 Chip Resistor R9 FRAOOOSOB420 Chip Resistor 1 R10 11 FRA00040B477 Chip Resistor 2 R12 FRA00040B486 Chip Resistor 2 R13 FRA000408464 Chip R...

Page 23: ... MOTOR ON HEAD LOAD WRITE GATE STEP DIRECTION SIDE SELECT INDEX PC WPPC TKOO PC INDEX PE WPPE TKOO PE N I MS f2 DS RE 18 30 7 5 0 READ DATA 111n 3 1 MTRON _167 t t t 1 l fi GIM M I rl SV L a n u H_S_ 2 19 HL sv HA13421 SD1r 3 7 3 01 01 14 1 SMD1 5V 1RIRP2 6HM 2 i 4 7K r6HL 8 2KI s 38 1 HH 3 9811 Ir svS 4 7K 3 _ SD2 38 6 02 11 riz 2 SMD4 F i 02 10 ri 3 STPACT 39 7 PS 02 SMD2 ____ 01 1S m 4 SMD3 5 l...

Page 24: ...17 CIRCUIT BOARD I Piii 2211 ft Component Side Top Solder Side Bottom 0 u ltll IOtll ll I 23 2cl0 i i Ec IO Pc IO i i i i ic IO 9cl0 i i ...

Page 25: ...1 y Wrlit Protect D ector i rP Cl I Jlj 1 rr_ 2 Q 0 1 I lz x I zz o gg 1 6 Ill z I z Z aaill O ill I 1il f Ji J J2 F 0 0 Control Circuit JI GND 1 2 J LAD LOAQl 4 Jj_ND DR UL 4 GND _ _ DEX J GNO I JLR SEL _l_ GND 1 DR SEL _l_ 1 GND 11 Q R _jfLl li GND I MQIQ t Q i I GND 11 oiREC1ioti 1l GNO 1 STEP 2 GNO 21 WRITE DATA 2 GNO 2 WRITEMTE _1_4 filiP 2s J IA Q J l Ji GND 27 WRITE PRO f CT ii GNO 29 READ ...

Page 26: ...Note ...

Page 27: ...iEl rt i Mll ttt J 1Jff f C7 iWI 5E C 2 ii o J 51 it fil r Jiilt J I iliffl F 1 7 I ig i F 1 7 I 1 tt L 5E L t 1i 71iE iJ 1 Gh i i o ef17 r J r77 l C7 711 il M tti r JiilL CJ 9 1i 7fiEW2it l J 7 I t ftf1LI J I ff f t 51 i To eWRITE GATE ERASE GATEf l ftL t tU i lL Lt 7 1 C A IJi c ff 2 ii 0 e2 0 1 SilEE filM Ll 9 S ll 9 1ti Ef P J l 0 GiEi f J6h ii Ll f Ta e 1 J l lfil 71 I lfil Cl f 1 lfiE b l 7 ...

Page 28: ... f Du o D10 fii Jt til 7 0 v 16 0 v 0 2 7 0 v o 5 o v 0 2 7 0 v 150 mA 15 mA 120 mA 800 mW 0 10 t 55 125 t SV Wc WO R12 RD DATA Out ii ff I I I I I I I I I I I I o f fiilll t PSM l Hftlllll illlUIT Vcc1 Vcc2 AMP IN AMP IN RD DATA OUT COMO COMl Wf1 Wfz EO Vcc1 Vcc2 Ve Ra Rt J 17 tilDli 111 RID t 7 t c7J 1 f tit fft Hltj Hllf t Ru II f 7 t c7J 7 1 f til lt lll ti 11 f t URtt Rnftl t t tilc7Jf0 b ltl...

Page 29: ...4Ricy 0 7 v i r 7 1 1J r iJ micy t1 11J It EE VReMS Vec2 12V lcoM lmA 2 7 v If l F micyt1 11J llEE VReMUS Vcc2 12V 1F micy 0 75 v Iii f lit ill Im IcoM 150 IIiA 7 Iii tJ 0 r J II EE VoLE loL lOOmA Vac 4 5V 0 5 v 1v A F71r Iii 1J 1 7 ii i1t fQHE Von 13 5V Vcc 5 5V 100 µA 1 v t iiff Im IER 120 mA 1 7 1 I t mt M ll Ac1w VeG 5V Vcc2 12V 7 7 7 1 I ti ilili fftt Ps1w VGG 5V Vcc2 10 8 l3 2V 1 5 V 71 I ti...

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