Panasonic JU-363, Service Manual

Page 1: ...DER NO MSD 850300500 ervice Manual Panasonic Micro Floppy Disk Drive JU 363 Matsushita Communication Industrial Co Ltd Memory Systems Division 3 1 4 chome Tsunashima Higashi Kohoku ku Yokohama 223 JAP...

Page 2: ...justment 9 4 10 Asymmetry Check 9 4 11 Test Point 10 5 REMOVALS AND INSTALLATIONS 5 1 Cover Removal and Installation 11 5 2 Mounting Bracket Removal and Installation 11 5 3 Front Panel and Eject Butto...

Page 3: ...363 The functions of the exerciser are as follows 1 Seek increment or alternate tracks 2 Read no data compare 3 Write 1F or 2F All O s or 1 s 4 Recalibration to track 00 The exerciser has switches and...

Page 4: ...covered by the above steps is not recoverable 2 3 Write Error If an error occurs during write it will be detected during the next revolution by a read operation that is normally called a write check T...

Page 5: ...ndex detector defective Not field replaceable 5 No 3 4 mounted improperly Not field replaceable 6 PCB motor ON circuit Replace PCB 7 PCB index detecting circuit Replace PCB 2 Ready inoperative 1 Item...

Page 6: ...SW ON RECALSW ON Set Address SW to Track 79 Media Defective Controller Defective Check Item 1 Table 3 1 Check Item 2 Table 3 1 Check Item 3 Table 3 1 NO NO END 4 Check Item 4 Table 3 1 Check Item 5 T...

Page 7: ...division 4 Write 2F all 1 s on track 79 on both sides 0 and 1 by SIDE SELECT 5 Check that the average amplitude level is 220 mV or more See Fig 4 1 4 4 Modulation and Resolution Check 1 Insert a good...

Page 8: ...Add and invert one channel Set vertical deflection to 0 1 V division VARIABLE PULL for the CE type or to 2 mV division for the DAD type Cat s Eye Type 5 Check amplitude waveforms for Side 0 and Side 1...

Page 9: ...oosen the two stepping motor screws and adjust 5 Seek from track 0 to 40 and from track 79 to 40 and check that the specification is met Do not seek to track 0 by RECAL in this case 6 After radial adj...

Page 10: ...18 minutes B c D A If B C A t B C fi I 30 CE Azimuth B _ D x b 15 DAD Fig 4 4 4 7 Index Burst Check 1 Insert an alignment diskette 2 Step to track 40 B C r D 1 111 1 Azimuth 0 waveforms Azimuth Wavefo...

Page 11: ...Track 0 Waveforms 4 9 Limiter Adjustment 1 Seek until head position is on track 0 2 Write 2F data on track 0 and measure read level 3 Loosen the limiter mounting screw to free the Iimiter 4 Bring the...

Page 12: ...t PS V out T1 V out T2 Sensor out for adjustment TRKO ZP READY RY SIDE SELECT SS INDEX IX STEP SP WRITE DATA READ DATA GROUND ANALOGUE GROUND AG WRITE GATE WG TRKO TO WP DIRECTION 10 MOTOR ON MO DRIVE...

Page 13: ...sembly exercising care not to let it be caught by the trigger lever shaft and remove the holder assembly 7 When installing the holder assembly back be careful not to place the holder assembly on the h...

Page 14: ...mbling the head stepper motor and steel belt Set the stepper motor on the jig Hook one end of the steel belt to the carriage tab Set the carriage on the jig in such a way that the screw hole in the pu...

Page 15: ...ctor on the printed circuit board 5 Remove the left and right mounting brackets as mentioned in Procedure 5 2 6 Disconnect the lead connector from the drive motor printed circuit board 7 Disconnect th...

Page 16: ...EXPLODED VIEW 1 Basic Model Assembly 1 14...

Page 17: ...28 YTF4S01680B4 Roi ler For Eject 29 YTF 1K00121 B4 Washer 30 YTF1 K00361 B4 Washer B 31 YTF1 K00370B4 Washer C 32 YTF3D03030B4 Limiter TRK f 33 YTUFS363WP Write Protect Assembly 34 YTUFS363TO Sensor...

Page 18: ...r 2 R18 ERJ8GCG183V Chip Resistor 1 L1 8L01RN1AS2 Choke Coil 1 C11 FCC00100B403 Chip Capacitor 1 C11 12 RPE122F104Z Ceramic Capacitor 2 R19 ERJ8GCG392V Chip Resistor 1 SW1 2 YTFWY0002084 Switch 2 C14...

Page 19: ...r L_ J r i 36 L _ _j T S 45 46 47 II 62 19 10 12 t 5V Q q 42 53 T S IOXP WPP COP OSI MON PSO IUS OCH DIN STP OCR SIS 1 0 WTG SUB BSL I BSL2 BSL4 C6 0 1 LI _J I 0 0 0 IO z ESW WSW HIS ROI PS svs Ill AP...

Page 20: ...26 ENABLE 2 21 20 19 18 17 IL I u 0 IL I v u 0 c C I C I a ii 2 u 1 OSC OUT INJECTOR 8 N J CJ _ x J 12VL _____ iD _ _ 3 1 OSC IN u C6 OelJJF MOOE 27 SELECT VOUT I0 _______ _______ _ 1 R4 2e7Cl v C7 O...

Page 21: ...13 15 17 0 0 0 0 0 0 0 0 0 20 0 19 0 22 24 0 0 21 23 0 0 Conductor side n n LL n n C25 e 11 e R33 e J Nv e C2G i 01 ln 02 R30 03 w 04 C24 05 f e 1 i 06 R31 e Nv e 07 r PS 0 0 Tl 0 0 T2 0 0 R34 QB R32...

Page 22: ...CIRCUIT BOARD OF DRIVE MOTOR Parts side C6 C7 1 Cl2 XI 101 e _ Cl3 C9 ef le CIO eUe RD2 Conductor side 1 1 u C2 fi i i i 1 1 l MfM Rll o 1 22 987654321 JI 0 0 0 0 0 0 0 0 0 ROI OPT2 el R3 I 2 x 3 4...

Page 23: ...Note...

Page 24: ...Printed in Japan...