sony_PMC-MD55_service_manual 维修电路图.pdf

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1、MICROFILM SERVICE MANUAL PERSONAL MINIDISC SYSTEM US Model Canadian Model AEP Model UK Model CD Model Name Using Similar Mechanism NEW Section CD Mechanism Type KSM-213CGP Optical Pick-up Name KSS-213C MD Model Name Using Similar Mechanism MDS-JB920 Section MD Mechanism Type MDM-5A Base Unit Name MB

2、U-5A Optical Pick-up Name KMS-260A SPECIFICATIONS PMC-MD55 U.S. and foreign patents licensed form Dolby Laboratories Licensing Corporation. (US only) 87.5 - 108 MHz (AEP, UK) (US, Canadian) (US, Canadian) MW: 531 - 1,602 kHz (AEP, UK) LW: 153 - 279 kHz (AEP, UK) AM (MW/LW): Loop antenna Continued on

3、 next page Ver 1.1 1999. 08 收音机爱好者资料库 Ra d i o Fa n s .CN 2 1.SERVICING NOTES.3 2.GENERAL Playing a CD .6 Recording a Whole CD .6 Playing an MD .7 Listening to the radio .7 Setting the Clock.8 Hooking up the System.8 3.DISASSEMBLY.9 4.TEST MODE. 15 5.ELECTRICAL ADJUSTMENTS Tuner Section . 19 MD Sect

4、ion . 21 CD Section . 28 Display Section . 30 6.DIAGRAMS 6-1.Block Diagram TUNER Section . 31 6-2Block Diagram MD Section . 34 6-3.Block Diagram CD Section . 37 6-4.Block Diagram FUNCTION SELECT/PANEL Section . 40 6-5.Block Diagram POWER AMP/POWER SUPPLY Section . 43 6-6.Block Diagram SUPER WOOFER S

5、ection . 45 6-7.Printed Wiring Board TUNER Section . 49 6-8.Schematic Diagram TUNER Section . 51 6-9.Schematic Diagram BD Section . 53 6-10. Printed Wiring Boards BD Section . 57 6-11. Printed Wiring Board DG Section . 59 6-12. Schematic Diagram DG Section . 61 6-13. Printed Wiring Boards MAIN Secti

6、on . 64 6-14. Schematic Diagram MAIN (CD) Section . 67 6-15. Schematic Diagram MAIN (SYSTEM CONTROL) Section . 70 6-16. Schematic Diagram MAIN (FUNCTION SELECT) Section . 73 6-17. Printed Wiring Board AUDIO/JACK Section . 75 6-18. Schematic Diagram AUDIO/JACK Section . 77 6-19. Schematic Diagram CD

7、MOTOR Section . 79 6-20. Printed Wiring Board CD MOTOR Section . 81 6-21. Printed Wiring Board CD OPEN/CLOSE Section . 82 6-22. Schematic Diagram CD OPEN/CLOSE Section . 83 6-23. Printed Wiring Boards PANEL Section . 86 6-24. Schematic Diagram PANEL Section . 89 6-25. Printed Wiring Boards POWER AMP

8、/POWER Section . 91 6-26. Schematic Diagram POWER AMP/POWER Section . 93 6-27. Printed Wiring Boards SUPER WOOFER Section . 95 6-28. Schematic Diagram SUPER WOOFER Section . 97 6-29. IC Pin Function Description .108 7.EXPLODED VIEWS. 118 8.ELECTRICAL PARTS LIST.128 SAFETY-RELATED COMPONENT WARNING!

9、COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY. TABLE OF CONTENTS Maximum power

10、 output 7 W+7 W ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COMPOSANTS IDENTIFIS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHMATIQUES ET LA LISTE DES PICES SONT CRITIQUES POUR LA SCURIT DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PICES SONY DONT LES NUMROS SONT DONNS DANS CE MANU

11、EL OU DANS LES SUPPLMENTS PUBLIS PAR SONY. 230 V AC, 50 Hz (AEP, UK) (US, Canadian) (MW/LW) 收音机爱好者资料库 Ra d i o Fa n s .CN 3 SECTION 1 SERVICING NOTES SAFETY CHECK-OUT After correcting the original service problem, perform the follow- ing safety check before releasing the set to the customer: Check t

12、he antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below. LEAKAGE TEST The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chas

13、sis, must not exceed 0.5 mA (500 microamperes). Leakage current can be measured by any one of three methods. 1.A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these instruments. 2.A battery-operated AC milliammeter. The Data Precision

14、 245 digital multimeter is suitable for this job. 3.Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The “limit” indica- tion is 0.75 V, so analog meters must have an accurate low- voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex- amples of a p

15、assive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suit- able. (See Fig. A) Fig. A.Using an AC voltmeter to check AC leakage. 1.5 k0.15 F AC voltmeter (0.75 V) To Exposed Metal Parts on Set Earth Ground CHUCK PLATE JIG ON REPAIRING On repairing

16、CD section, playing a disc without the CD lid, use Chuck Plate Jig. Code number of Chuck Plate Jig: X-4918-255-1 The laser diode in the optical pick-up block may suffer electro- static break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and th

17、e human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care. NOTES ON LASER DIODE EMISSION CHECK The laser beam on this model is con

18、centrated so as to be focused on the disc reflective surface by the objective lens in the optical pick-up block. Therefore, when checking the laser diode emis- sion, observe from more than 30 cm away from the objective lens. Notes on chip component replacement Never reuse a disconnected chip compone

19、nt. Notice that the minus side of a tantalum capacitor may be dam- aged by heat. Flexible Circuit Board Repairing Keep the temperature of the soldering iron around 270 C dur- ing repairing. Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). Be careful not to

20、 apply force on the conductor when soldering or unsoldering. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. This appliance is classified as a

21、CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior. Laser component in this product is capable of emitting radiation exceeding the limit for Class 1. The following caution label is located inside the unit. 收音机爱好者资料库 Ra d i o Fa n s .CN 4 JIG FOR CHECKING BD BOAR

22、D WAVEFORM The special jig (J-2501-149-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be performed are shown as follows. GND: Ground I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser) IOP : For measuring IOP (Chec

23、k the deterioration of the optical pick-up laser) TEO : TRK error signal (Traverse adjustment) VC: Reference level for checking the signal RF: RF signal (Check jitter) RF VC TEO for MDM-5 IOP I+3V VC RF TEO IOP I+3V GND VC RF TEO IOP I+3V GND 1 5 1 6 for MDM-3 CN110 RF 5P Connector 6P connector VCTE

24、O IOP I+3V GND Mechanism deck 5 CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS (for MD Section) Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent. Details of the procedures are described in “5 Electrical Adjustments”. 0.9 mW power Spe

25、cified value : 0.84 to 0.92 mW 7.0 mW power Specified value : 6.8 to 7.2 mW IOP (at 7mW) Labeled on the optical pickup IOP value 10% Error rate check Specified value : a.For points A and B C1 error : About 200 ADER : Below 2 b.For point C C1 error : Below 50 ADER : Below 2 Error rate check Specified

26、 value : a.When using test disc (MDW-74/AU-1) C1 error : Below 80 ADER : Below 2 b.When using check disc (TDYS-1) C1 error : Below 50 CPLAY error rate check Specified value : C1 error : Below 80 ADER : Below 2 Laser power check (6-1 : See page 23) Focus bias check (6-2 : See page 23) C PLAY check (6

27、-3 : See page 23) Self-recording/playback check (6-4 : See page 23) Criteria for Determination (Unsatisfactory if specified value is not satisfied) Clean the optical pick-up Adjust again Replace the optical pick-up Replace the optical pick-up Replace the optical pick-up Replace the optical pick-up I

28、f always unsatisfactory: Replace the overwrite head Check for disconnection of the circuits around the overwrite head If occasionally unsatisfactory: Check if the overwrite head is distorted Check the mechanism around the sled Measure if unsatisfactory: Note: The criteria for determination above is

29、intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments. When performing adjustments, use the specified values for adjustments. NOTE ON MOUNTING PULLY pulley DC motor (CD lid open/close) 2.5 mm Press fit pulley to motor with jig. 6 SECTION 2 GEN

30、ERAL This section is extracted from instruction manual. 7 8 9 Note: Follow the disassembly procedure in the numerical order given. REAR CABINET This set can be disassembled in the order shown below. SECTION 3 DISASSEMBLY SetRear cabinetFront cabinet block Main board sectionMain board TU block, MD bl

31、ockMD mechanism deck Upper cabinet blockCD PICK-UP assy Slider (CAM)Base unit (MBU-5A), BD boardSW board, loading motor (M103) 1three screws (BTP2.6 8) 1three screws (BTP2.6 8) 2two screws (BVTT3 8) 3four screws (BTP3 10) 3four screws (BTP3 10) 3screw (BTP3 10) 4rear cabinet 10 FRONT CABINET BLOCK U

32、PPER CABINET BLOCK 1three screws (BVTP3 12) 1three screws (BVTP3 12) 3wire, parallel (ffc) 12P (CN407) 4cabinet (front) block 2harness 2connector (CN711) 4cabinet (upper) block 1wire, parallel (ffc) 16P (from OPTICAL PICK-UP connector) 1wire, parallel (ffc) 11P (CN1001) 1wire, parallel (ffc) 8P (CN4

33、09) 3three claws 11 CD PICK-UP ASSY MAIN BOARD SECTION 1two screws (PWH2.6 10) 1two screws (PWH2.6 10) 2PICK-UP assy 1connector (CN302) 1connector (CN303) 1connector (CN401) 1connector (CN404) 4main board section 1connector (CN704) 3two screws (BVTP3 10) 2wire parallel (ffc) 26P (CN405) 2wire parall

34、el (ffc) 16P (CN701) 2wire parallel (ffc) 11P (CN702) 1connector (CN408) 1connector (CN402) 1connector (CN312) 2wire parallel (ffc) 9P (CN406) 2wire parallel (ffc) 8P (CN409) 3two screws (BVTP3 10) 12 MAIN BOARD TU BLOCK, MD BLOCK shield plate (main) 1two screws (BVTT2.6 6) 1two screws (BVTT2.6 6) 2

35、main board 4two screws (BVTT2.6 5) 6two screws (BVTP3 10) 8two screws (BVTP3 10) 3four screws (BVTP2.6 8) 3screw (BVTP2.6 8) 8screw (BVTP3 10) 7TU block assy 9harness 1two screws (BVTP2.6 8) 2LCD block assy 0MD block assy 5shield plate (front) 13 MD MECHANISM DECK SLIDER (CAM) 2shield plate (upper)

36、1four claws 5two screws (BVTTWH M3) 7MD mechanism deck (MDM-5A) 6harness 5two screws (BVTTWH M3) 3connector (CN601) 4wire, parallel (ffc) 21P (CN102) 4wire, parallel (ffc) 23P (CN103) 1 two screws (P2.6 6) 2 bracket (Guide L) 3 leaf spring 5 bracket (Guide R) 6 slider (Cam) 4 two screws (P2.6 6) Set

37、 the shaft of Lever (O/C) to be at the position in the figure. Set the shaft of Cam gear to be at the position in the figure. Note for Installation of Slider A (Cam) 14 1 three screws (P2.6 6) 2 base unit (MBU-5A) 3 Remove the solder (Five portion). 4 screw (M1.7 4) 6 flexible board (CN101) 7 BD boa

38、rd 5 flexible board (CN104) BASE UNIT (MBU-5A), BD BOARD SW BOARD, LOADING MOTOR (M103) 5three screws (BTP2.6 6) 6SW board 4loading motor (M103) 3two screws (PWH1.7 4) 1screw (PTPWH M2.6 6) 2gear B 15 Refer to “5. ELECTRICAL ADJUSTMENT” for the test mode of CD section. MD SECTION 1.PRECAUTIONS FOR U

39、SE OF TEST MODE As loading related operations will be performed regardless of the test mode operations being performed, be sure to check that the disc is stopped before setting and removing it. Even if the MD EJECT button is pressed while the disc is rotating during continuous playback, continuous r

40、ecording, etc., the disc will not stop rotating. Therefore, it will be ejected while rotating. Be sure to press the MD EJECT button after pressing the NO, CANCEL button and the rotation of disc is stopped. 1-1. Recording laser emission mode and operating buttons Continuous recording mode (CREC MODE)

41、 Laser power check mode (LDPWR CHECK) Laser power adjustment mode (LDPWR ADJUST) When pressing the REC button. 2.SETTING THE TEST MODE 1.Set to standby state. 2.While pressing the both BASS/TREBLE and EDIT buttons, press the button , MD t s (MD) t , MD n s (MD). 3.Release the both BASS/TREBLE and ED

42、IT buttons to enter the MD test mode. 3.RELEASING THE TEST MODE Press the POWER button to turn the power OFF, or press the RESET (bottom of the player unit) switch. 4.BASIC OPERATIONS OF THE TEST MODE All operations are performed using the JOG dial, YES, ENTER button, and NO, CANCEL button. The func

43、tions of these buttons are as follows. SECTION 4 TEST MODE Function nameFunction JOG dialChanges parameters and modes YES, ENTER buttonProceeds onto the next step. Finalizes input. NO, CANCEL buttonReturns to previous step. Stops operations. 77 Z Z 16 5.SELECTING THE TEST MODE There are 9 types of t

44、est modes as shown below. The mode can be switched by turning the JOG dial. After selecting the mode to be used, press the YES, ENTER button. Display TEMP ADJUST LDPWR ADJUST LDPWR CHECK EFBAL ADJUST FBIAS ADJUST FBIAS CHECK CPLAY MODE CREC MODE EEP MODE Contents Temperature compensation offset adjustment Laser power adjustment Laser power check EF balance adjustment Focus bias adjustment Focus bias check Continuous playback mode Continuous rec