Panasonic JU-253-T Service Manual Download Page 8 | Manualshive

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Summary of Contents for JU-253-T

Page 1: ...ORDER NO MSD870909100 ervice Manual Flexible Disk Storage Drive 3 5 Inch JU 253 T JU 253 P JU 253 PK IC...

Page 2: ...oving and Remounting the Cover 12 2 Removing and Remounting the Front Panel Assembly 12 3 Removing and Remounting the Guide Plates 12 4 Removing and Remounting the Holder Assembly and Rollers 12 5 Rem...

Page 3: ...ving and Remounting the Control PC Board 12 14 Removing and Remounting the Drive Motor Assemmbly 12 15 Disassembling and Reassembling the Mounting Bracket Assembly 12 16 Removing and Remounting the Pu...

Page 4: ...fail criteria in inspections 2 MODELS AND MODEL NUMBERS 2 1 3 5 inch FOO Series ii j ji B iii _ 67 5TPI L_ _ JU 31X JU 312 c JU 313 L_ JU 314 JU 32X JU 322 E JU 323 JU 323A JU 324 JU 36X JU 362 E JU 3...

Page 5: ...in the diskette Contaminated heads can be cleaned by a general purpose non abrasive head cleaning diskette Please follow the suitable procedure provided with the cleaning diskette 2 Random electrical...

Page 6: ...other This error is called a Interchange ability error which can be caused mostly by the following reason which should be checked as follows 1 Head misalignment Refer to Adjustments and Confirmation I...

Page 7: ...e program permits Install Exerciser on FDD Power SW DC SW ON MOT SW ON Drive Select SW ON YES Media Defective Controller Defective Check Item 1 Table6 1 Check Item 2 Table 6 1 Check Item 3 Table 6 1 4...

Page 8: ...t PCB motor ON circuit PCB index detection circuit See Item 1 PCB read circuit Track 00 assembl PCB track Odetection failure Ste er motor Guide shaft contamination or dama PCBste er driver circuit See...

Page 9: ...ified track Sides 0 1 CAUTION Do not write when using alignment diskette Check that write protect sensor is properly operating with a data diskette Note Section 9 describes the adjustment procedures i...

Page 10: ...nsert 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 below CH1 T1 CH2 T2 EXT Index No 8 Pin of CMOS...

Page 11: ...ions 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 Syst...

Page 12: ...40 and confirm that the adjustment has been completed 9 After the radial adjustment be sure to confirm track 00 sensor adjustment 9 9 Note A digital alignment test instrument for 3 5 inch FDDs permit...

Page 13: ...ase as follows 1 ms division 3 Check that the time from oscilloscope start to the first data pulse meets the l B specifications of Table 8 1 DAD system 4 If Index Burst is not within specification adj...

Page 14: ...ows Set horizontal deflection to 1ms division CH1 ZP EXT Step No 20 Pin of CMOSITTL Adaptor 2 Step between specified tracks as shown in the FLAGO item of Table 8 1 Turn the seek delay switch on the ex...

Page 15: ...the Asymmetry item of Table 8 1 3 Set the oscilloscope as follows CH1 Read Data No 30 Pin of CMOS TTL Adaptor CH2 T1 Set time base to 1 s division and vertical deflection to 0 2 v division 4 Write 1F...

Page 16: ...Signal No 1 NC Disk Change Reset 2 Disk Change Disk In 6 Drive Select 3 8 Index 10 Drive Select 0 12 Drive Select 1 14 Drive Select 2 16 Motor On 18 Direction Select 20 Step 22 Write Data 24 Write Gat...

Page 17: ...KETTE 3 5 inch Alignment Diskette Table 11 1 TYPof TPI Alignment P N Index Azimuth Diskette Burst DAD JU 01AA 67 5 CE 817 363CE 20TRK 20TRK 135 DAD 817 384 40TRK 40TRK 14 Radial Alignment 20TRK 40TRK...

Page 18: ...o set screws on the right side guide plate 3 Lift the right side guide plate so that it is removed from the roller pinched by the recess in the guide plate and remove the right side guide plate throug...

Page 19: ...PC Flexible printed circuit 16 Fig 12 5 He dF PC J6 Removing the Head FPC Track O Connector and Stepper Motor Connector 12 6 Removing and Remounting the Head Carriage Assembly Rod Clamp and Guide Rod...

Page 20: ...k 0 Assembly 17 12 8 Removing and Remounting the Stepper Motor 1 Remove the cover according to the procedure in section 12 1 2 Remove the stepper motor cable connector according to the procedure in se...

Page 21: ...eps 1 and 2 Cautions for Remounting 4 Remount the front hooks on the base so that both of them on the right and left sides are faced inward 5 Place the eject lever springs so that their coiled portion...

Page 22: ...rocedure in section 12 4 2 Remove the three soldered portions of the microswitch assembly lead wires on the D motor PC board 3 Remove the microswitch assembly set screw and remove the microswitch asse...

Page 23: ...emounting the Drive Motor Assembly 1 Remove the holder assembly according to the procedure in section 12 4 2 Remove the control PC board according to the procedure in section 12 15 3 Remove the micros...

Page 24: ...e figure riding across the stopper until it reaches the dotted line position remove the shutter lever assembly with the tab on the holder aligned with the hole and remove the shutter lever spring from...

Page 25: ...r assembly can be easily ejected 3 Lift the holder assembly by hands and gently slide it toward you then the four roller sections on the holder will be removed from the eject levers Keep in mind that...

Page 26: ...pply oil to the guide rod but not too much insert the rod into the head assembly move it back and forth several times and confirm that the guide rod moves smoothly 23 8 Place the position where the he...

Page 27: ...ing to the procedures in steps 7 and 8 7 Put grease in the size of a grain of rice on the lead screw 8 Extend the grease over the lead screw evenly using an applicator 9 After remounting the stepper m...

Page 28: ...ring has a slit so it can be easily removed by pinching the portion adjacent to the slit by tweezers 4 Remove the eject lever 5 Remount the eject lever in the reverse procedure of steps 1 to 4 25 Fig...

Page 29: ...epper motor connector according to the procedure in section 12 4 3 Remove the three set screws from the control PC board 4 Remove the D motor PC board socket housing from the connector JS and remove t...

Page 30: ...r of step 1 Mounting Bracket Right I I Washer Bracket Collar Bracket I I Mounting Bracket Left I I Fig 12 15 Disassembling the Mounting Bracket 12 16 Removing and Remounting the Pushbutton 1 Pull down...

Page 31: ...e the reverse insertion preventive lever until it reaches the doted line position and remove it with the tab on the holder aligned with the hole 5 Reassemble the holder assembly in the reverse procedu...

Page 32: ...13 EXPLODED VIEW 1 1 JU 253 011 29...

Page 33: ...EXPLODED VIEW 1 2 JU 253 01T 30...

Page 34: ...EXPLODED VIEW 2 JU 253 01 p 0 j K 31 28...

Page 35: ...EXPLODED VIEW 2 2 JU 253 01 P 01 PK _____ _ 40 32...

Page 36: ...0990B4 Screw For Stepper Motor 28 XSB25 4FX Screw Clamp 2 TRK0Assy 1 Control PCB 3 29 XSB25 6FX Screw For Bracket 30 YTF1E00981B4 Screw For Bra_c ket 31 XSS2 3FX Screw For Guide Plate 32 XSS2 4FX Scre...

Page 37: ...Eject 27 YTF1E00990B4 Screw For Ste_eper Motor 28 XSB25 4FX Screw Clamp 2 TRK0As 1 Control PCB 3 29 XSB25 6FX Screw For Bracket 32 XSS2 4FX Screw For Drive Motor 33 YTUF253DET Micro Switch Assembly 3...

Page 38: ...7 YTF1E00990B4 Screw For Stepper Motor 28 XSB25 4FX Screw Clamp 2 TRK0Assy 1 Control PCB 3 29 XSB25 6FX Screw For Bracket 32 XSS2 4FX Screw For Drive Motor 33 YTUF253DET Micro Switch Assembly 34 YTUF2...

Page 39: ...otor 1 CN4 FJC00401 8402 Connector 1 CN3 FJC004018409 Connector 1 CN6 FJC004108407 Connector 1 L1 FBR06HA500 High Frequency Coil Ferrite Beads 1 2 CN IMSA 9215H T Short Plug 2 IC4 HD74HC74FP80 IC 1 Q7...

Page 40: ...MCR18EZHJ 122 R31 MCR18EZHJ181 R74 MCR18EZHJ562 R16 17 MCR18EZHJ912 Q5 10 80 DTC114TKT 97 UN2215 TW D2 MA151WA TW DAN202KT 97 D5 MA151WK TW DAP202KT 97 Q4 DTC114TKT 96 UN2215 TX IC6 TC4511FTE85L IC7...

Page 41: ...tor 1 CN4 FJC00401B402 Connector 1 CN3 FJC00401B409 Connector 1 CN6 FJC004108407 Connector 1 L1 FBR06HA500 H _g_h Frequency Coil Ferrite Beads 1 2 CN IMSA 9215H T Short Plug 2 IC4 HD74HC74FP80 IC 1 Q7...

Page 42: ...MCR18EZHJ105 R24 25 MCR18EZHJ122 R31 MCR18EZHJ181 R74 MCR18EZHJ562 QS 10 80 DTC114TKT 97 UN2215 TW D2 MA151WA TW DAN202KT 97 DS MA151WK TW DAP202KT 97 Q4 DTC114TKT 96 UN2215 TX IC6 TC4S11 FTE85L IC7...

Page 43: ...K WRITE DATA Ki 1l t r 1 L J 03 MAISIA r Q7 ri r W G v rvv vvv r 1 OTC114TK ____ R37 IOk R36 10K _ VyA 1 I rv Qs SA OTC114TK DTCl14TK so1rlli _______________________Jj 7 01 37 080 MA151A SD2j _c_ ll J...

Page 44: ...114 m L _______________ _ 4 s 1 1 8 1 2 sv oMor _ i9 OM 0 111 0 I H L f _ j sv ixPcn _ sv_ _ li f D IX IP WP f L 4 r IC 1 00Pr7 F T 4 _Jl l T S t _________ T s tSV RS MOY 13 _ _ _ _ ___i M lLO Y HO R9...

Page 45: ..._ Rl6 14C OO 1 1 T i 611 l fll IL Jc2s A 40 16s L JA a 02 i IPI I I 11R3a u rofL J uQIO K r JIH 4 K 04K C21 ri C4 DB D7K u I Q6 R39 Cl7 L L L J u u R28 E _ _ L J r T ii c n J co ri R32 N Ul u UlllJ o...

Page 46: ...CIRCUIT BOARD JU 253 01PK Component Side Top Solder Side Bottom HltN d N 40 HA16680 1 e MP 5 6 17 43 27 18...

Page 47: ...ATION NO TITLE DATE WHAT IS YOUR OVERALL RATING THIS PUBLICATION 0 VERYGOOD 0 FAIR D VERYPOOR D GOOD D POOR IS THE MATERIAL PRESENTED EFFECTIVELY 0 WELL ORGANIZED 0 FULLY COVERED D CLEAR 0 CORRECT DWE...

Page 48: ...Matsushita Communication Industrial Co Ltd Memory Systems Division 3 1 4 chome Tsunashima Higashi Kohoku ku Yokohama 223 JAPAN...

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