panasonic SJ-MJ75 维修电路图.pdf

ORDER No.AD0001029C8 Portable MD Player SJ-MJ75 Colour (S).Silver Type Areas EB.Great Britain. EG.Europe. GH.Hong Kong. 1 收音机爱好者资料库 Ra d i o Fa n s .CN SPECIFICATIONS Specifications Mechanism unit:RAE1611Z Mechanism Series Audio System:MiniDisc digital audio system Laser:Semiconductor laser (=790 nm) Sampling frequency: 44.1 kHz Decoding:Adaptive Transform Acoustic Coding (ATRAC) No. of channels:2 (left and right, stereo) 1 (monaural) Frequency response : 20 Hz-20 kHz (+0 dB, -8dB) Wow and flutter:Below measurable limit General Output Jack:Phones, 14 Power output:5 mW+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: 71.5x78.5x15.4 mm incl.projecting parts: 72.8x79.9x15.4 mm Weight:86 g (with battery) 61 g (without battery) Play time (When used in hold mode, at 25C, on a flat, stable surface) Battery type:Play time Rechargeable:About 10 hours Panasonic alkaline: About 34 hours 2 收音机爱好者资料库 Ra d i o Fa n s .CN 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. 1 1. Precaution of Laser Diode 2. Accessories 3 收音机爱好者资料库 Ra d i o Fa n s .CN - 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. (RP-BP61GY-S) 4 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). 4.1. Mechainsm Unit (optical pickup) 1. Do not subject the mechanism unit (optical pickup) to static electricity as it is extremely sensitive to electrical shock. 2. Before removing the mechanism unit (optical pickup), the short land on the flexible board is shorted with a solder build-up to prevent damage to the laser diode. (As shown in Fig.1.) 3. It is a posibility to disconnect if it applies over pressures to the flexible P.C.B., as take care of handling the flexible P.C.B. Fig.1 5 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. to protect the breaking down by static electricity. After connecting the flexible P.C.B. of the optical pickup to the connector of main P.C.B., remove the solder build-up on the short-land and confirm that is opened. (As shown in Fig.1) 4.3. Grounding for electrostatic breakdown prevention 1. Human body grounding Use the anti-static wrist strap to discharge the static electricity from your 6 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. So, take care not to let your clothes touch the traverse deck (optical pickup). Fig.2 Fig.3 7 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. - 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. 5.1.1. Checking for the P.C.B. (A side) 8 9 - Check the P.C.B. (A side) as shown below. 5.1.2. Checking for the P.C.B. (B side) 10 - To check the IC501 on side B of P.C.B., refer to the table 1 and illustration below. 11 12 5.2. Replacement for the intermediate cabinet - Follow the (Step 1) - (Step 3) of item 5.1.1. 13 14 15 16 17 18 5.3. Replacement for the disc cover assy - Follow the (Step 1) - (Step 3) of item 5.1.1. - Follow the (Step 1) - (Step 4) of item 5.2. 19 20 5.4. Replacement for the traverse motor - Follow the (Step 1) - (Step 3) of item 5.1.1. 21 22 23 24 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. 25 26 27 28 29 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 30 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” in “Operation Checks and Main Component Replacement Procedures). B. Set the battery. C. While pressing the battery cover to connect the battery power, continuously press the OPEN/CLOSE switch. (As shown in Fig.4) D. The optical pickup moves up and down and emits a laser. (Caution: Do not look directly at the laser light source.) If the laser does not emit a beam, follow the item of “operation check” in “Troubleshooting Guide ” and check for a malfunction. E. Make the optical pickup move to the center of the movement range (refer to Fig.4) (Note : Do not touch the optical pick up lens.). F. Remove the battery. Fig.4 31 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. Turn off the power, select for OFF the main units HOLD switch. 4. Press the remote controllers keys in between two seconds, enter the adjustment mode. A. Press VOL+ button by your right thumb, and press VOL-button by your left thumb with keeping on pressing VOL+ button. B. Release VOL+ button with keeping on pressing VOL-button, and press button by your right thumb. C. Release VOL-button with keeping on pressing button, and press button by your left thumb. Release button with keeping on button, and release button. (a-c are shown in Fig.5) Fig.5 32 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 modeDisplay Playback-only disc automatic adjustment T1 Magneto-optical disc automatic adjustment T2 Playback-only disc automatic adjustment value check T3 Magneto-optical disc automatic adjustment value check T4 Laser power checkT5 EFM jitter measurementT6 ADIP jitter measurementT7 Error rate measurementT8 Tilt measurement T9 PWB inspection (audio test)TA EEPROM checkTE *In the display of T1 TE shown above, you must adjust T1 and T2. 6.1.4. Playback-only disc automatic adjustment With the T1 displayed, set the test disc and press the PLAY key to active the adjustment mode. During the adjustment, “OADJ” will be displayed. If there are no abnormalities, “OOK” will be displayed. (Note1) If the key is pressed while the “OOK” or “ONG” is being displayed, the setting returns to the T1 display. When finished, remove the disc. 33 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. During the adjsutment, “AADJ” will be displayed. If there are no abnormalities, “AOK” will be displayed. (Note 2) If key is pressed while the “OOK” or “ONG” is being displayed, the setting returns to the T2 display. When finished, remove the disc. Note 2: When “ANG” is displayed, follow the item of “operation check” in “Troubleshooting Guide” and check for a malfunction. *To exit the adjustment mode, remove the battery. 6.2. Checking the main units keys 1. Set the battery and connect the remote controller. 2. Turn off the power, select for OFF the main units HOLD switch. 3. Press the remote controllers keys in between two seconds, enter the adjustment mode. A. Press VOL+ button by your right thumb, and press VOL-button by your left thumb with keeping on pressing VOL+ button. B. Release VOL+ button with keeping on pressing VOL-button, and press button by your right thumb. C. Release VOL-button with keeping on pressing button, and press button by your left thumb. Release button with keeping on button, and release button. (a-c are shown in Fig.6) Fig.6 34 4. When entering the main units 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” is not displayed, check the following voltage for each key. KeyTest pointONOFF IC201-35 pin0V2.3V HOLDTPX1102.3V0V VOL +TP3070V2.3V VOL -TP3070.6V2.3V TP3071.2V2.3V TP3071.7V2.3V To exit the main units key check mode, remove the battery. Note: Refer to “Printed Circuit Board and Wiring Connection Diagram” for the test points. 7. Troubleshooting Guide 35 36 37 38 39 40 41 42 43 44 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. - S204 : R. skip / search () switch. - S206 : Play / stop () switch. - S207 : Cover open / close det. switch. - S208 : Hold switch in “OFF” position. - 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 the internal 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 the parts 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. 45 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 ICs, Transistors and Diodes 9. Schematic Diagram 10. Printed Circuit Board and Wiring Connection Diagram 11. Block Diagram 12. Terminal Function of IC s 12.1. IC1 (LA9607T-TFM) : RF AMP 46 Pin No. MarkI/O Division Function 1PPITPit/Group discrimination input terminal (“H”:pit, “L”: group) (Not used, open) 2VCCIPower supply input terminal 3JIRF signal that I-V converted input terminal 4I 5FISide beam signal that I-V converted input terminal 6E 7DIMain beam signal that I-V converted input termianl 8C 9B 10A 11VEEGND terminal 12LDOOAPC output terminal 13LDSILaser light quantity that I-V converted input terminal 14LDREFILaser control signal input terminal 15FBALIFocus balance control signal input terminal 16TBALITracking balance control signal input terminal 17 TOFFSET ITracking offset control signal input terminal 18 FOFFSET ITracking offset control signal input terminal 19 AOFFSET IABCD offset control signal input terminal 20SGCIAGC control signal input terminal 21DSW0IDisc mode setting input terminal (“H”:low reflection rate disc, “L”:high reflection rate disc, both DSW0 and DSW1 are “L”: laser off) 22DSW1IDisc mode setting input terminal (“H”:track is pit- row, “L”:track is group, both DSWO and DSW1 are “L”:laser off) 47 Pin No. MarkI/O Division Function 23VRIFor pass-com 1/2 VCC (reference voltage) input terminal 24VCO1/2 VCC (reference voltage) output terminal 25FEOFocus error signal output terminal 26TEOTracking error signal output terminal 27ABCDOMain beam light quantity signal output terminal 28HFLIIFor making HFL signal input terminal (when group mode) 29BOTTOMOBottom signal of RF signal output terminal 30PEAKOPeak signal of RF signal output terminal 31HFLOTrack detection signal input terminal 32BHCConnected to GND through capacitor 33PHC 34RFVEEGND terminal 35EQ0ORF equalizer output terminal 36EQIIRF equalizer input terminal 37RFOORF signal output terminal 38RFVCCIPower supply input terminal 39ADIPCROADIP carrier signal output terminal 403TSWI3T/11T monitor terminal select switch input terminal 41GLHSWGND terminal 42 RAGCSW IRF AGC ON/OFF select switch input terminal 43WDOOWobble signal output terminal 44WOIIWobble signal input terminal 45SETRIBand pass filter set ting input terminal 48 Pin No. MarkI/O Division Function 46CADICapaciter for DC cut of Wobble signal connect terminal 47BWCTIBand pass filter select terminal for wobble signal 48SLEEPISleep mode terminal (“H”: power supply ON, “L”: power supply OFF) (Connected to power supply through capacitor) 12.2. IC101 (LC89642-8A) : MSP Pin No. MarkI/O Division Function 1FRIBias resistor terminal of VCEC oscillation frequency (Connected to power supply through resistor) 2ISETIBias resistor terminal of VCEC volta