panasonic SJ-MJ55 维修电路图.pdf

《panasonic SJ-MJ55 维修电路图.pdf》由会员分享，可在线阅读，更多相关《panasonic SJ-MJ55 维修电路图.pdf（52页珍藏版）》请在收音机爱好者资料库上搜索。

1、ORDER No.AD0211153C3 Portable MD Player SJ-MJ55GH Colour (S).Silver Type SPECIFICATIONS Specifications 收音机爱好者资料库 Ra d i o Fa n s .CN Audio System:MiniDisc digital audio system Beam source:Semiconductor laser Wave length:780 nm Sampling frequency:44.1 kHz Coding:Adaptive Transform Acoustic Coding (AT

2、RAC/ ATRAC3) No. of channels:2 (left and right, stereo) 1 (monaural) Frequency response:20 Hz20 kHz (+0 dB, -6dB) Wow and flutter:Below measurable limit General Headphones: Output level (approx.): 3.0 mW+3.0 mW Inpedance (approx.):32 Speakers (ceramic card type): Output level (approx.): 45 mW+45 mW

3、Inpedance (approx.):200 / 1kHz Power supply Rechargeable battery:DC 1.2V (included rechargeable battery) Battery:DC 1.5V (One LR6, AA, UM-3 battery) Dimensions (WxHxD) Cabinet dimensions:79.9x72.7x14.1 mm incl.projecting parts:80.9x74.2x17.0 mm Weights:96 g (with battery) 69 g (without battery) Play

4、 time Approximate operating time in hours (in hold mode, at 25C, on a flat, stable surface) Battery type:Play time (Stereo/ LP2/ LP4) Rechargeable:40 hours/ 53 hours/ 70 hours Panasonic alkaline:63 hours/ 93 hours/ 121 hours Both together:103 hours/ 148 hours/ 193 hours When the rechargeable battery

5、 (included) is fully recharged. AC adaptor and charger AC adaptor input:AC220 V, 50/60 Hz, 5 VA AC adaptor output and Charger input: DC 3.5 V, 0.5A Charger output:DC 2V, 0.5 A Recharging time:About 3.5 hours 收音机爱好者资料库 Ra d i o Fa n s .CN Notes: - The play time may be less depending on the operating

6、conditions. - Specifications are subject to change without notice. Weight and dimensions are approximate. 2002 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. 1. Accessories - Stereo earphones.1 pc. / (L0BAB0000174) - Wired r

7、emote control.1 pc. / (N2QCBD000020) - External battery case.1 pc. / (K3ZZ00200038) - Nickel-metal hydride rechargeable battery.1 pc. / (RFKFFAZ01EM1) - Soft case.1 pc. / (RFC0074-H) - Speaker/Battery charger.1 pc. / (L0EAAB000011) - AC adaptor.1 pc. / (N0JCBD000001) 2. Precaution of Laser Diode 收音机

8、爱好者资料库 Ra d i o Fa n s .CN 3. Operating Instructions 4. Handling Precautions for MD Mechanism (Optical pickup) The laser diode in the MD mechanism (optical pickup) may break down due to potential difference caused by static electricity of clothes or human body. So, be careful of electrostatic breakd

9、own during repair of the traverse deck (optical pickup). 4.1. Handling the MD mechanism (optical pickup) 1. The MD mechanism (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 preven

10、t 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

11、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 ) Fig. 1 Fig. 2 4.2. Grounding for electrostatic breakdown prevention 1. Human body grounding Use the anti-static wrist strap to discharge the stat

12、ic 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 grounde

13、d through the wrist strap. So, take care not to let your clothes touch the traverse deck (optical pickup). Fig. 3 Fig. 4 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

14、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, an

15、d then perform the adjustments (Laser power, off-set, ROM/ RAM). 5.1. Checking for the P.C.B. - Check the P.C.B. as shown below. 5.2. Replacement for the intermediate cabinet - Follow the (Step1)-(Step3) of item 5.1. 5.3. Replacement for the disk cover assy and the link units (L), (R) - Follow the (

16、Step1)-(Step3) of item 5.1. - Follow the (Step1)-(Step4) of item 5.2. 5.4. Replacement for the traverse motor - Follow the (Step1)-(Step3) of item 5.1. 5.5. Replacement for the optical pickup - Follow the (Step1)-(Step3) of item 5.1. - Follow the (Step1)-(Step5) of item 5.4. 6. Measurements and Adju

17、stments Note: After replacing the main components (optical pickup, traverse motor, IC201, IC202 or P.C.B. assy, etc.) of mechanism unit block, change to the adjust mode, and then perform the “Laser power adjustment”, “Off-setautomatic adjustment” and “Playback-only disc/magneto-optical disc automati

18、c 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) 3. Laser power meter (LE8010 or compatible meter) 4. Remote controller (Parts No: N2QCBD000020) or Remote controller of S

19、J-MJ88 etc. (Parts No: RFEV025P-SM) 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 Note: For use of MD cartridge type laser power meter, disassemble this unit into the state of only the

20、mechanism unit before perform the laser power adjustment (as for the method of disassembly, refer to “5.2. Replacement for the intermediatecabinet”). 1. Set the battery and connect the remote controller. (The position of the HOLD switch of remote controller is “OFF”.) 2. Turn off the power, and swit

21、ch main units HOLD switch off. 3. Press the VOL+(), VOL-(), (), and ()keys on the remote controller within two seconds. (asshown in Fig. 5 ) Fig. 5 4. When the adjustment mode is activated, “T0E ” will be displayed on the LCD of remote controller. After “T0E ” is displayed, select the desired adjust

22、ment item with the button or button of the remote controller. (If it is not displayed, perform the procedures written above again.) *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 . Note: If it i

23、s going to perform “T2E” and “T3E”, without performing “T1E”, it will be displayed as “NG”. If it is going to perform “T3E” when “T2E” is “NG”, it will be displayed as “NG”. 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

24、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

25、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. Doi

26、ng so may result in damage to the MD. - 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. Have “T0*” indicated on display, and move the optical pickup to

27、the most inside (only when a MD cartridge type laser power meter is used). 2. Set the laser power meter. For use of stick type laser power meter. 2-1 Uncover the laser power meter (as shown in Fig. 6 ). 2-2 Locate the sensor of the laser power meter right over above the optical pickup (horizontally

28、at a level of the disc position). (as shown in Fig. 7 ) For use of MD cartridge type laser power meter. 2-1 Open the shutter of the laser power meter. (as shown in Fig. 9 ) 2-2 Set the laser power meter. (as shown in Fig. 8 ) Fig. 6 3. Press the key of the remote controller (“T0E ” changes to “LD ”

29、of the LCD). 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

30、“over 660 W” 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 fi

31、nished. Fig. 7 Fig. 8 How to open the shutter 1. Insert a thin and hard card to the crevice between laser power meter, and pull a card in the direction of an arrow (1). 2. A stopper moves in the direction of an arrow (2). 3. Move the shutter in the direction of an arrow (3) and the shutter opens. Ca

32、ution: Please be sure to shut the shutter after the adjustment end. Fig. 9 6.2.3. Off-set automatic adjustment 1. With “T1E ” displayed, leave the disc cover open. 2. Pressing the key on the remote controller will start adjustment. 3. During adjustment, “FADJ ” is displayed on the LCD of the remote

33、controller. If there is no abnormality, “FOK ” will be displayed. 4. Pressing the key while “FOK ” 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

34、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

35、 Guide” in the order. 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

36、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 “ON

37、G ” 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 un

38、its HOLD switch ON. 3. Press the VOL+(), VOL-(), (), and () keys on the remote controller within two seconds. (asshown in Fig. 5 ) 4. When the unit enters the unit key check mode, the display shows “E KEX ”. While “E KEX ” is displayed, press the , , , VOL+, VOL- and HOLD keys of the unit. / *When t

39、he first key is pressed, the display will change to “E ”. Main units keysLCD display position and letters After the second key is pressed, the first digit displayed will change from “ ” to “O ”. HOLD OFF VOL+After the second key is pressed, the second digit displayed will change from “ ” to “O ”. VO

40、L- After the second key is pressed, the third digit displayed will change from “ ” to “O ”. 5. After all keys have been pressed and there is no abnormality, “E OOO ” will be displayed. 6. Perform below voltage check about the keys come under if it is not displayed “E OOO ”. Main units keysCheck poin

41、tsONOFF IC201 48pin0V2.2V HOLDTP4280V2.2V VOL+TP4210V2.2V VOL-TP4210.58V2.2V TP4211.13V2.2V TP4211.69V2.2V Note: Refer to “12. Printed Circuit Board Diagram” for the test points. 7. Remove the battery when you exit from this mode. 7. Troubleshooting Guide 8. Precaution for Replacement of EEPROM IC (

42、IC202) and SYSTEMCONTROL IC (IC201) 8.1. Replacement of EEPROM IC (IC202) In case of replacing EEPROM IC (IC202), depending on the Parts No. of SYSTEMCONTROL (IC201), it is need to replace SYSTEMCONTROL simultaneously. For details, please refer to the following table. Parts No. of SYSTEMCONTROL (IC2

43、01)Replacement MN101C32GAG1Need MN101C32GAG2Needlessness Note When “MN101C32GAG1” is mounted, please exchange for “MN101C32GAG2”. 8.2. Replacement of SYSTEMCONTROL IC (IC201) Exchange only SYSTEMCONTROL IC (IC201). Caution After replacing either “IC201” or “IC202”, please be sure to perform the “las

44、er power adjustment”, “Off-set automatic adjustment” and “Playback only disc/magneto-opticaldisc automatic adjustment”. (Refer to “6 Measurements and Adjustments ”) If the set is operated without adjusting, an error will be displayed and the set will not operate. 9. Precaution for Replacement of P.C

45、.B. ASSY After replacing P.C.B. ASSY, please be sure to perform the “laser power adjustment”, “Off-set automatic adjustment” and “Playback only disc/magneto-optical disc automatic adjustment”.(Refer to “6 Measurements and Adjustments ”) If the set is operated without adjusting, an error will be disp

46、layed and the set will not operate. 10. Schematic Diagram Notes 10.1. Type Illustration of ICs, Transistors and Diodes 10.2. Schematic Diagram Notes This schematic diagram may be modified at any time with the development of new technology. Notes: S207 :Cover open/close det. switch S208 :Hold switch

47、in “OFF” position. (HOLD) SX201 :Volume control switch (-) SX202 :Volume control switch (+) SX203 :Skip/search switch ( ) SX204 :Skip/search switch ( ) SX206 :Play/stop switch ( ) - Indicated voltage values are the standard values for the unit measured by the DC electronic circuit tester (high-imped

48、ance) 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 (*) (*) The play of MD is performed in “Jitter measurement / (T4E)” mode. (Refer to “6.2.1. Enter the adjustment mode ” for the / method of going into “Jittermeasurement (T4E) mode”). Important safety notice: Components identified by mark have special characteristics important fo