panasonic SJ-MJ88 维修电路图.pdf

ORDER No.AD0101008C2 Portable MD Player SJ-MJ88 MD unit: RAE1611Z Mechanism Series Colour (S).Silver Type Areas EB.Great Britain. EG.Europe. 1 收音机爱好者资料库 Ra d i o Fa n s .CN SPECIFICATIONS Specifications Audio System:MiniDisc digital audio system Laser:Semiconductor laser (=780 nm) Sampling frequency:44.1 kHz Coding:Adaptive Transform Acoustic Coding (ATRAC) No. of channels:2 (left and right, stereo) 1 (monaural) Frequency response: 20 Hz20 kHz (+0 dB, -8dB) Wow and flutter:Below measurable limit General Output terminal Output Jack:Phones, 22 Power output:3.5 mW+3.5 mW Power supply Rechargeable battery: DC 1.2V (included rechargeable battery) Battery:DC 1.5V (One LR6, AA, UM-3 battery) Dimensions (WxHxD) Cabinet dimensions : 71.5x78.5x11.8 mm incl.projecting parts : 74.1x80.1x13.9 mm Weights:79 g (with battery) 54 g (without battery) Play time (When used in hold mode, at 25C, on a flat, stable surface) Battery type:Play time Rechargeable:About 18 hours 2 收音机爱好者资料库 Ra d i o Fa n s .CN Panasonic alkaline: About 70 hours Both together:About 88 hours Charger Input:AC120-240 V (EG) / AC 230-240V (EB), 50 Hz 4W Output:DC 340mA (EG)/DC 350mA (EB), 1.2V Recharging time:About 2 hours Notes: - The play time may be less depending on the operating conditions. - Specifications are subject to charge without notice. Weight and dimensions are approximate. 1 1. Accessories - Stereo earphones.1 pc. (L0BAB0000162) - Wired remote control.1 pc. (RFEV025P-SM) - External battery case.1 pc. (K3ZZ00200038) - Rechargeable Ni-Cd battery.1 pc. (RP-BP62EYS1) 3 收音机爱好者资料库 Ra d i o Fa n s .CN - Carrying case.1 pc. (RFC0056-K) For EB area - Charger.1 pc. (RP-BC155AEBY) For EG area - Charger.1 pc. (RP-BC155AEYB) 2. Precaution of Laser Diode 4 3. Operating Instructions 4. Handling Precautions for Traverse Deck The laser diode in the traverse deck (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 traverse deck (optical pickup). 4.1. Handling the traverse deck (optical pickup) 1. The traverse deck (optical pickup) is an extremely high-precision construction and must not be subjected to impact, excessive vibration, or other types of rough handling. 2. In order to prevent static electricity damage to the laser diode, use a short pin or similar tool to short the optical pickups flexible circuit boards after they have been disconnected from the main circuit board. (as shown in Fig. 1 ) 3. Handle the flexible circuit boards with care; excessive force could cause them to be broken. 4. Do not turn the pre-set variable resistor (for adjustment of the laser power); it has been adjusted at the factory. (as shown in Fig. 2 ) 5 Fig. 1 Fig. 2 4.2. Grounding for electrostatic breakdown prevention 1. Human body grounding 6 Use the anti-static wrist strap to discharge the static electricity from your body. (as shown in Fig. 3 ) 2. Work table grounding Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is placed, and ground the sheet. (as shown in Fig. 4 ) Caution The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the traverse deck (optical pickup). Fig. 3 Fig. 4 7 5. Operation Checks and Component Replacement Procedures - This section describes procedures for checking the operation of the major printed circuit boards and replacing the main components. - For reassembly after operation checks or replacement, reverse the respective procedures. Special reassembly procedures are described only when required. - 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”. 5.1. Checking for the P.C.B. 8 9 - Check the P.C.B. as shown below. 10 5.2. Replacement for the lock unit, open knob and intermediate cabinet - Follow the (Step 1) - (Step 3) of item 5.1. 11 12 13 14 5.3. Replacement for the disc cover assy - Follow the (Step 1) - (Step 3) of item 5.1. - Follow the (Step 1) - (Step 3) of item 5.2. 15 5.4. Replacement for the traverse motor - Follow the (Step 1) - (Step 3) of item 5.1. 16 17 18 19 5.5. Replacement for the optical pickup - Follow the (Step 1) - (Step 3) of item 5.1. - Follow the (Step 1) - (Step 5) of item 5.4. 20 21 22 23 24 6. Measurements and Adjustments 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 “Laser power adjustment”, “Off-set automatic adjustment” and “Playback-onlydisc/ magneto-optical disc automatic adjustment”. 6.1. Instruments to prepare 1. Playback-only disc (Test disc RFKV0006) 2. Commercially available recordable disc (fully recorded with music) (magneto- optical disc) 25 3. Laser power meter (LE8010 or compatible meter) 4. Remote controller 6.2. Laser power adjustment, Off-set automatic adjustment, Playback-only disc/magneto-optical disc automatic adjustment magnet 6.2.1. Enter the adjustment mode Caution: Place the unit on the insulation sheet with the disc cover side facing up. 1. Disassemble the unit so that only the mechanism unit and the printed circuit board are exposed. (Refer to (Step1) of the main part replacement procedure “5.2. Replacement for the intermediate cabinet”). 2. Move the optical pickup to the innermost side and attach the disc cover. 3. Set the battery and connect the remote controller. 4. Turn off the power, and switch main units HOLD switch off. 5. Press the VOL+, VOL-, , and keys on the remote controller within two seconds. (as shown in Fig. 5 ) Fig. 5 6. When the adjustment mode is activated, “T0E ” will be displayed on the LCD of remote controller. After “T0E ” is displayed, select the desired adjustment item with the button or button of the remote controller. (If it is not displayed, perform the procedures written above again.) 26 Adjustment modeDisplay Laser power adjustmentT0E Off-set automatic adjustmentT1E Magneto-optical disc automatic adjustmentT2E Playback-only disc automatic adjustmentT3E Jitter meajurement (74minutes)T4E Jitter meajurement (60 minutes)T5E Destination changeT6E Off-set automatic adjustment value checkT7E Magneto-optical disc automatic adjustment value check T8E Playback-only disc automatic adjustment value check T9E Error rate measurement (double velocity)TAE ROM collectionTBE DRAM checkTCE AgingTDE Tilt measurement TEE PWB inspectionTFE *In the display of T0E TFE shown above, you must adjust T0E , T1E , T2E and T3E . You must perform the adjustment by observing the order T0E T1E T2E T3E . 6.2.2. Laser Power Adjustment Adjust each laser power: read power for reading (play). 6.2.2.1. Set the Unit to the Adjustment Mode Cautions About handling the optical pickup and the magnetic head. - The optical pickup is structured precisely; therefore, it is very fragile. Be careful not to touch it with the edge of the laser power meter. Do not touch the lens. - The sensor of the laser power meter is a very fine part. Be careful not to touch it to the optical pickup lens. - The focus point of the laser reaches to 356F. Therefore, avoid adjusting using laser power for a long time because the sensor of the laser power meter may be burned. - Do not set the unit to the laser power adjustment mode with the MD loaded. Doing so may result in damage to the MD. 27 - Laser diode in the optical pickup may be destroyed by the static electricity generated in your clothes or body. Be especially careful with the static electricity. 6.2.2.2. Adjustment Procedure 1. Uncover the laser power meter. (as shown in Fig. 6 ) Fig. 6 2. Locate the sensor of the laser power meter at a position above the optical pickup (horizontally at a level of the disc position). (as shown in Fig. 7 ) Fig. 7 3. Press the key of the remote controller (“T0E ” changes to “LD ” of the LCD). 28 4. Press the key of the remote controller (“LD ” changes to “LP ” of the LCD). 5. Set the laser power at 600 W10% by using VOL+ and VOL- key of the remote controller. Specified range: 600 W10% Caution: Proceeding on to the subsequent adjustment procedure with the read power exceeding 600 W10% will result in damage to the optical pickup. 6. Set the laser power with the key of the remote controller (“LP ” changes to “LDOK ” in the LCD). 7. Press the key of the remote controller (“LDOK ” changes to “T0E ” on the LDC. 8. Remove the laser power meter. Laser power adjustment is finished. REFERENCE We recommend you to use a sensor type laser power meter for laser power adjustment of this set. But if available is a MD cartridge type only, follow the procedure below. 1. Disassemble the unit so that only the mechanism unit and the printed circuit board are exposed. (as shown in Fig. 8 ) 2. Set the laser power meter cartridge. (as shown in Fig. 8 ) 3. Set the battery and attach and secure the battery cover with a rubber band. (as shown in Fig. 9 ) 4. Follow the steps for “6.2.1. Enter the adjustment mode”. (Subsequent procedures are the same as those for the sensor type.) Fig. 8 29 Fig. 9 30 6.2.3. Off-set automatic adjustment 1. Remove the mechanism unit from the disc cover. Then move the optical pickup to the center, and attach the mechanism unit again to the disc cover. 2. With “T1E ” displayed, leave the disc cover open. 3. Pressing the key on the remote controller will start adjustment. 4. During adjustment, “FADJ ” is displayed on the LCD of the remote controller. If there is no abnormality, “FADJOK ” will be displayed. 5. Pressing the key while “FADJOK ” is displayed will return to the “T1E ” display mode. 6.2.4. Magneto-optical disc automatically adjustment 1. Have “T2E ” indicated on display, and set the full-recorded magneto-optical disc. (Check to make sure the disc is properly seated.) 2. Press key of the remote controller. The adjustment is started. 3. During adjustment, “AADJ ” is displayed on the LCD of the remote controller. If there is no abnormality, “AOK ” will be displayed. Note: If it is displayed “ANG ”, check “7. Troubleshooting Guide” in the order. 31 4. Press key (“AOK ” or “ANG ” changes to “T2E ”). 5. After the adjustment is finished, remove the disc. 6.2.5. Playback-only disc automatic adjustment 1. Have “T3E ” indicated on display, set the playback-only disc. (Check to make sure the disc is properly seated.) 2. Press key of the remote controller. The adjustment is started. 3. During adjustment. “AADJ ” is displayed on the LCD of the remote controller. If there is no abnormality, “AOK ” will be displayed. Note: If it is displayed “ONG ”, check “7. Troubleshooting Guide” in the order. 4. Press key (“OOK ” or “ONG ” changes to “T3E ”). 5. After the adjustment is finished, remove the disc. 6.2.6. How to get out the adjustment mode Remove the battery when you finish the adjustment. 6.3. Checking the main units keys 1. Set the battery and connect the remote controller. 2. Turn off the power, and switch main units HOLD switch OFF. 3. Press the VOL+, VOL-, , and keys on the remote controller within two seconds. (as shown in Fig. 5 ) 4. When the unit enters the unit key check mode, the display shows “T KEX ”. While “T KEX ” is displayed, press the , , and VOL(+, -) keys of the unit in the specified order and then switch off the HOLD switch. *When thefirst key is pressed, the display will change to “T ”. 32 Main units keysLCD display position and letters After the third key is pressed, the second digit displayed will change from “ ” to “O ”. VOL+After the second key is pressed, the third digit displayed will change from “ ” to “O ”. VOL- HOLD OFFThe first digit displayed will change from “ ” to “O ”. 5. After all keys have been pressed and there is no abnormality, “T OOO ” will be displayed. 6. Perform below voltage check about the keys come under if it is not displayed “T OOO ”. Main units keysCheck pointsONOFF HOLDTP4280V2.2V IC201 48pin0V2.2V TP4211.13V2.2V TP4211.69V2.2V VOL+TP4210V2.2V VOL-TP4210.58V2.2V Note: Refer to “10. Printed Circuit Board Diagram” for the test points. 7. Remove the battery when you exit from this mode. 7. Troubleshooting Guide 33 34 35 36 37 38 39 40 8. Schematic Diagram Notes 8.1. Type Illustration of ICs, Transistors and Diodes 41 8.2. Schematic Diagram Notes This schematic diagram may be modified at any time with the development of new technology. Notes: S201 :Volume control switch (+) S202 :volume control switch (-) S203 :Skip/search switch ( ) S204 :Skip/search switch ( ) S206 :Play/stop switch ( ) S207 :Cover open/close det. switch S208 :Hold switch in “OFF” position. (HOLD) - Indicated voltage values are the standard values for the unit measured by the DC electronic circuit tester (high-impedance) with the chassis taken as standard. Therefore, there may exist some errors in the voltage values, depending on theinternal impedance of the DC circuit tester. No mark: MD STOP ( ): MD play 1kHz, L+R, 0dB Important safety notice: Components identified by mark have special characteristics important for safety. Furthermore, special parts which have purpose of fire-retardant (resistors), high- quality sound (capacitors), low-noise (resistors), etc. are used. When replacing any of components, be sure to use only manufactures specified parts shown in theparts list. Caution! IC and LSI are sensitive to static electricity. Secondary trouble can be prevented by taking care during repair. Cover the parts boxes made of plastics with aluminum foil. Ground the soldering iron. Put a conductive mat on the work table. Do not touch the legs of IC or LSI with the fingers directly. 42 Voltage and signal line : Positive voltage line : Playback signal line 9. Schematic Diagram 10. Printed Circuit Board Diagram 11. Block Diagram 12. Terminal Function of ICs 12.1. IC1 (AN86772FHKEBV): RF AMP 43 Pin No. MarkI/O Division Function 1LDOOLD amp. output terminal 2LDINILD amp. reverse input terminal 3APCPDIPhoto diode light quantity det. input terminal 4NCNot used, open 5ARFOORF amp. output terminal 6NCNot used, open 7EQINIEQ input terminal 8CRFAGCIRFAGC capacitor connection terminal (Connected to power supply through capacitor) 9OUTRFOEFM output terminal 10NCNot used, open 11PEAKOEFM bright-side detection output terminal 12GNDGND terminal 13BOTMOEFM dark-side detection output terminal 14CEAI3T envelope det. capacitor connection terminal (Connected to power supply through capacitor) 15MON3TO3T