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Panasonic SJ-MJ75 Service Manual

Portable md player
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ORDER No.AD0001029C8
Portable MD Player
SJ-MJ75
Colour
(S)...................Silver Type
Areas
EB...................Great Britain.
EG...................Europe.
GH...................Hong Kong.
1
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Summary of Contents for Panasonic SJ-MJ75

  • Page 1 ORDER No.AD0001029C8 Portable MD Player SJ-MJ75 Colour (S)....Silver Type Areas EB....Great Britain. EG....Europe. GH....Hong Kong.

  • Page 2: Specifications

    72.8x79.9x15.4 mm parts: Weight: 86 g (with battery) 61 g (without battery) Play time (When used in hold mode, at 25°C, on a flat, stable surface) Battery type: Play time Rechargeable: About 10 hours Panasonic About 34 hours alkaline:...

  • Page 3: Precaution Of Laser Diode

    Both together: About 44 hours Charger Input: AC120-240 V (EG)/ AC230-240 V (EB)/ AC220V (GH), 50 Hz 4W Notes: The play time may be less depending on the operating conditions. Specifications are subject to charge without notice. Weight and dimensions are approximate.
  • Page 4 Battery case............1pc. (RFA1136-H) Carrying case............1pc. (RFC0056-K) Remote control............1pc. (RFEV025P-SM) Stereo earphones...........1pc. (RFEV319P-S1A) For EB area Charger..............1pc. (RP-BC155AEBY) For EG area Charger..............1pc. (RP-BC155AEYB) For GH area Charger..............1pc. (RP-BC155AGH) For EB, EG areas Rechargeable battery with carrying case....1pc. (RFKFBP140HSY) For GH area Rechargeable battery with carrying case....1pc.

  • Page 5: Location Of Controls

    3. Location of Controls 4. Handling Precautions for Traverse Deck (Mechanism Unit) The laser diode in the mechanism unit (optical pickup) may break down due to potential difference caused by static electricity of clothes or human body.So, be careful of electrostatic breakdown during repair of the mechanism unit (optical pickup).
  • Page 6 4.2. Caution for Replacement of Mechanism Unit (Optical Pickup) If you remove the flexible P.C.B. of the optical pickup from the connector of main P.C.B., perform it after shorting with a solder build-up the short land to protect the breaking down by static electricity. The optical pickup that is supplied as replacement parts is shorted with a solder build-up the short-land of flexible P.C.B.
  • Page 7 body. (As shown in Fig.2.) 2. Work table grounding Put a conductive material (sheet) or steel sheet on the area where the optical pickup is placed, and ground the sheet. (As shown in Fig.3) Caution: The static electricity of your clothes will not be grounded through the wrist strap.

  • Page 8: Operation Checks And Component Replacement Procedures

    5. Operation Checks and Component Replacement Procedures This section describes procedures for checking the operation of the major printed circuit boards and replaceing the main components. For reassembly after operation checks or replacement, reverse the respective procedures. Special reassembly procedures are described only when required.
  • Page 10 Check the P.C.B. (A side) as shown below. 5.1.2. Checking for the P.C.B. (B side)
  • Page 11 To check the IC501 on side B of P.C.B., refer to the table 1 and illustration below.
  • Page 13 5.2. Replacement for the intermediate cabinet Follow the (Step 1) - (Step 3) of item 5.1.1.
  • Page 19 5.3. Replacement for the disc cover ass'y Follow the (Step 1) - (Step 3) of item 5.1.1. Follow the (Step 1) - (Step 4) of item 5.2.
  • Page 21 5.4. Replacement for the traverse motor Follow the (Step 1) - (Step 3) of item 5.1.1.
  • Page 25 5.5. Replacement for the optical pickup Follow the (Step 1) - (Step 3) of item 5.1.1. Follow the (Step 1) - (Step 5) of item 5.4.
  • Page 30 6. Measurements and Adjsutments Note: After replacing the main components (optical pickup or traverse motor, etc.) of mechanism unit block, change to the adjust mode, and then perform the “ROM/ RAM auto-adjustment”. 6.1. ROM/RAM Disc Automatical Adjustments...
  • Page 31 6.1.1. Necessary instruments to adjust 1. Test disc (Playback-only disc) 2. Commercially available recordable disc (fully recorded with music) (magneto- optical disc) 3. Remote controller 6.1.2. Preparations for adjustment 1. Check the laser emission. A. Make the player to the mechanism unit only. (Refer to Fig.3 or the item of “Replacement for the intermediate cabinet”...
  • Page 32 6.1.3. Enter the adjustment mode 1. Mount the mechanism unit on the disc cover. (Shown in the item of “Replacement for the intermediate cabinet” in “Operation Checks and Main Component Replacement Procedures”). 2. Connect the remote controller, set the battery and close the battery cover. 3.
  • Page 33 5. When the adjustment mode is activated, “TE” will be displayed. After “TE” is displayed, select the desired adjustment item with the button or button. Adjustment mode Adjustment mode Display Playback-only disc automatic adjustment Magneto-optical disc automatic adjustment Playback-only disc automatic adjustment value check Magneto-optical disc automatic adjustment value check...
  • Page 34 Note 1: When “ONG” is displayed, follow the item of “operation check” in “Troubleshooting Guide” and check for a malfunction. 6.1.5. Magneto-optical disc automatic adjustment With the T2 displayed, set the commercially available recordable disc (which is fully recorded with music). Press key to activate the adjustment mode.

  • Page 35: Troubleshooting Guide

    4. When entering the main unit’s key check mode, “KEY JP” will be displayed. When “KEY JP” is displayed, press , VOL (+/-) keys and set the HOLD switch to OFF (no order). Then, “KEY OK” will be displayed. Note: If “KEY OK”...

  • Page 45: Schematic Diagram Notes

    8. Schematic Diagram Notes 8.1. Schemtic Diagram Notes This schematic diagram may be modified at any time with the development of new technology. Notes: S201 : Volume (VOLUME +) switch. S202 : Volume (VOLUME -) switch. S203 : F. skip / search ( ) switch.

  • Page 46: Schematic Diagram

    Do not touch the legs of IC or LSI with the fingers directly. Voltage and signal line : Positive voltage line : Playback signal line 8.2. Type Illustration of IC's, Transistors and Diodes 9. Schematic Diagram 10. Printed Circuit Board and Wiring Connection Diagram 11.
  • Page 47 Mark Function Division PPIT — Pit/Group discrimination input terminal (“H”:pit, “L”: group) (Not used, open) Power supply input terminal RF signal that I-V converted input terminal Side beam signal that I-V converted input terminal Main beam signal that I-V converted input termianl —...
  • Page 48 Mark Function Division For pass-com 1/2 VCC (reference voltage) input terminal 1/2 VCC (reference voltage) output terminal Focus error signal output terminal Tracking error signal output terminal ABCD Main beam light quantity signal output terminal HFLI For making HFL signal input terminal (when group mode) 29 BOTTOM...
  • Page 49 Mark Function Division Capaciter for DC cut of Wobble signal connect terminal BWCT Band pass filter select terminal for wobble signal SLEEP Sleep mode terminal (“H”: power supply ON, “L”: power supply OFF) (Connected to power supply through capacitor) 12.2. IC101 (LC89642-8A) : MSP Mark Function Division...
  • Page 50 Mark Function Division TEST1 Input terminal for test (Connected to power supply) Track detection signal input terminal VDD2 Power supply terminal — GND terminal VDD1 Power supply terminal AV SS 1 — GND terminal PEAK Peak signal of RF input terminal 18 BOTTOM Bottom signal of RF input...
  • Page 51 Mark Function Division MAD6 Adress output terminal to DRAM (Not used, open) AOFF ABCD offset control signal output terminal MAD5 Adress output terminal to DRAM (Not used, open) FOFF Focus offset control signal output terminal TOFF Tracking offset control signal output terminal MAD4 Adress output terminal to DRAM...
  • Page 52 Mark Function Division MAD0 Adress output terminal to DRAM (Not used, open) Focus PWM output terminal Tracking PWM output terminal TESTI0 — Input terminal for test (Not used, open) AVDD Power supply terminal OUTL 1 bit DAC L channel output terminal OUTR 1 bit DAC R channel output...
  • Page 53 terminal Mark Function Division SMON0 Monitor signal 0 output terminal (Not used, open) FSEQ Flame detection signal output terminal (Not used, open) CLV servo clock judgement signal output terminal (Not used, open) MCST — Not used, open MRASB RAS signal to DRAM output terminal (Not used, open) Focus OK signal output...
  • Page 54 Mark Function Division ADIPWO Wobble signal input terminal Data in/output terminal to DRAM SHOCK Shock detection signal output terminal MCASB CAS signal to DRAM output terminal (Not used, open) VCEC clock signal output terminal (Not used, open) MOEB OE signal to DRAM output terminal (Not used, open) VCVSS...
  • Page 55 Mark Function Division VREF+ Reference voltage+ input terminal Power supply terminal OSC2 System clock input terminal (6MHz) OSC1 System clock output terminal (6MHz) — GND terminal Sub clock input terminal (Not used, connected to GND) Sub clock output terminal (Not used, open) MMOD —...
  • Page 56 Mark Function Division OPEN Cover open/close detect terminal (“H”:open) PLAY Play key input terminal (“L” :STOP/PLAY) AGC TC RF AGC select output terminal (Not used, open) Driver IC stand by output terminal ZDTCL Lch no signal detect input terminal (“H”:no signal) Focus OK signal input terminal ZDTCR...
  • Page 57 Mark Function Division STBY2 4ch driver IC stand by 2 output terminal RFCONT RF amp power control output terminal SEDIR Sled error direction input terminal TBALOK Tracking balance adjustment output terminal (“H”:adjustment)(Not used, open) — — Not used, open 3TSW 3T/11T monitor select switch output terminal 70 RAGCSW...
  • Page 58 Mark Function Division SPWIN Roter position detect comparater(W) input terminal SPCOM Spindle motor coil center input terminal EXTCLK Not used, open — Charge pump capacitor 1(+) connect terminal — Charge pump capacitor 1(-) connect terminal — Charge pump capacitor 2(+) connect terminal —...
  • Page 59 Mark Function Division STHB H1, H2 bridge mute input terminal STALL Standby input terminal PW1VM Power supply terminal PW1OUT Half bridge 1 output terminal (Not used, open) PWPG — GND terminal PW2OUT Half bridge 2 output terminal PW2VM Power supply terminal PWIN2 Half bridge input terminal PWIN1...
  • Page 60 Mark Function Division BRK- Brake comparater- input terminal BRK+ Brake comparater+ input terminal VCC2 Power supply terminal VCC1 Power supply terminal SP VM1 Half bridge 1 input terminal SP U Spindle motor coil(U) output terminal SP PG1 — GND terminal SP V Spindle motor coil(V) output terminal...
  • Page 61 Rechargeable Battery Ass’y is carried about Battery Carrying Case. (as shown in Fig.6) Fig.7 14. Caution in Use of Rechargeable Battery Ass'y Take Rechargeable Battery Ass’y out of Battery Carrying Case and use it. Be sure to carry Rechargeable Battery Carrying Case. If not, it may either heat or ignite by shorting with a metal.

  • Page 62: Replacement Parts List

    15. Replacement Parts List 15.1. Replacement Parts List Notes: *Important safety notice: Components identified by mark have special characteristics important for safety. Funrthermore, special parts which have purposes of fire-retardant (resistors), high-quality sound (capacitors), low-noise (resistors), etc. are used. When replacing any of components, be sure to use only manufacture’s specified parts shown in the parts list.
  • Page 63 Ref. No. Part No. Part Name & Description Remarks RHQ0083-S SCREW RXQ0658-3 LINK UNIT(L) RXQ0659-1 LINK UNIT(R) RXQ0660 HOLDER ASS'Y RYF0531Z-S DISC COVER ASS'Y RYQ0273-S INTERMEDIATE CABINET RGV0255-S OPEN KNOB RYK0977A-S CABINET ASS'Y (EB)(EG) RYK0977B-S CABINET ASS'Y (GH) RGK1210-S JACK PIECE RGU1817-S BUTTON,OPERATION RGU1818-S...
  • Page 64 Ref. No. Part No. Part Name & Description Remarks ECUE1C103KBQ 16V 0.01U ECUE1H120JCQ 50V 12P ECUVNJ105KBV 63V 1U ECUVNA224KBV 10V 0.22U ECUE1H040CCQ 50V 4P ECUVNJ105KBV 63V 1U ECUENA104KBQ 10V 0.1U RCST0GZ226RG 4V 22U ECUENA104KBQ 10V 0.1U RCST0GZ106RG 4V 10U ECUENA104KBQ 10V 0.1U C17,18 ECUV1C823KBV...
  • Page 65 Ref. No. Part No. Part Name & Description Remarks C410 ECUENA104KBQ 10V 0.1U C411 ECUE1C103KBQ 16V 0.01U C501 RCST0GZ106RG 4V 10U C502 ECUENA104KBQ 10V 0.1U C504 ECUVNJ105KBV 63V 1U C505 RCST0GZ106RG 4V 10U C506 ECUVNJ105KBV 63V 1U C507,08 RCST0EX227RE 2.5V 220U C509 RCST0GZ106RG 4V 10U...
  • Page 66 Ref. No. Part No. Part Name & Description Remarks ERJ2GEJ821X 1/4W 820 ERJ2GEJ104X 1/4W 100K EXB24V113JX 1/16W 11K ERJ2GEJ391X 1/4W 390 ERJ2GEJ823X 1/4W 82K ERJ2GEJ223X 1/4W 22K ERJ2GEJ474X 1/4W 470K ERJ2GEJ105X 1/4W 1M R20,21 ERJ2GEJ104X 1/4W 100K ERJ2GEJ393X 1/4W 39K ERJ2GEJ1R0X 1/4W 1 R101...
  • Page 67 Ref. No. Part No. Part Name & Description Remarks R504 EXB24V153JX 1/16W 15K R505 EXB24V821JX 1/16W 820 R506 EXB24V225JX 1/16W 2.2M R507,08 EXB24V472JX 1/16W 4.7K R509 ERJ2GEJ270X 1/4W 27 R510,11 ERJ2GEJ104X 1/4W 100K RX229 ERJ2GEJ104X 1/4W 100K RX901 ERJ3GEYJ103Z 1/16W 10K S201,02 RSG0038-P SW,VOLUME +/-...

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