Manuals / Sony / Home Audio / Stereo System

Sony MDS-JB920 service manual 61, 62

Models: MDS-JB920

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MDS-JB920

6-11. PRINTED WIRING BOARD – MAIN Board (side A) – See• page 45 for Circuit Boards Location.

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Contents

MDS-JB920 SPECIFICATIONSSERVICE MANUAL MINI DISC DECKSELF-DIAGNOSISFUNCTION – 2 –Table of Error Codes Items of Error History Mode Items and Contents– 3 – Selecting the Test ModeSECTION SERVICING NOTES TABLE OF CONTENTS6.DIAGRAMS DISASSEMBLYNotes on chip component replacement – 5 –Flexible Circuit Board Repairing ADVARSELJIG FOR CHECKING BD BOARD WAVEFORM Display Precedure – 7 –Record Precedure – 8 – Checks Prior to Parts Replacement and AdjustmentsForced Reset ProcedurePrecedure – 9 –Retry Cause Display Mode Fig. 1 Reading the Test Mode DisplayHexadecimal nBinary Conversion Table – 10 –Reading the Display LOCATION OF CONTROLS SECTION GENERAL– 11 – • Front view • Rear view– 12 – – 13 – DISASSEMBLY – 14 –CASE SECTIONMAIN BOARD – 15 –FRONT PANEL SECITON SLIDER CAM – 16 –MECHANISM SECTION MDM-5A SW BOARD, LOADING MOTOR M103 – 17 –BASE UNIT MBU-5A,BD BOARD SECTION TEST MODE 1. PRECAUTIONS FOR USE OF TEST MODE2. SETTING THE TEST MODE – 18 –– 19 – 5. SELECTING THE TEST MODE5-3. Non-VolatileMemory Mode EEP MODE – 20 –5-1.Operating the Continuous Playback Mode 7. TEST MODE DISPLAYS – 21 –6. FUNCTIONS OF OTHER BUTTONS 4.Auto gain display Not used in servicing– 22 – MEANINGS OF OTHER DISPLAYS– 23 – SECTION ELECTRICAL ADJUSTMENTS1.PARTS REPLACEMENT AND ADJUSTMENT Laser power meter 2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSINON4. PRECAUTIONS FOR ADJUSTMENTS – 24 –6-1.Temperature Compensation Offset Check – 25 –6. CHECK PRIOR TO REPAIRS Checking ProcedureCD Error Rate Check – 26 –6-5.C PLAY Checking MO Error Rate Check 6-4.Focus Bias Check10. LASER POWER ADJUSTMENT 7. INITIAL SETTING OF ADJUSTMENT VALUE9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT – 27 –Adjusting Procedure 11. TRAVERSE ADJUSTMENTSpecification Connection12.FOCUS BIAS ADJUSTMENT – 29 –– 30 – 13.ERROR RATE CHECK15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT 14. FOCUS BIAS CHECKBD BOARD SIDE A 16. ADJUSTING POINTS AND CONNECTING POINTS– 31 – BD BOARD SIDE B6-1.IC PIN FUNCTION DESCRIPTION SECTION DIAGRAMS– 32 – – 33 – •BD BOARD IC121 CXD2654R– 34 – – 35 – – 36 – •MAIN BOARD IC100 CXD8607N A/D CONVERTER– 37 – – 38 – – 40 – MDS-JB920– 39 – – 42 – BLOCK DIAGRAM – SERVO Section –– 41 – MDS-JB920– 44 – 6-3.BLOCK DIAGRAM – MAIN Section –– 43 – MDS-JB920• Circuit Boards Location – 45 –– 46 – Note on Schematic Diagram– 48 – 6-5.PRINTED WIRING BOARDS – BD Section –– 47 – •See page 45 for Circuit Boards LocationMDS-JB920 – 49 –– 50 – Page– 52 – 6-7.SCHEMATIC DIAGRAM – BD Section 2/2 – See•– 51 – MDS-JB920MDS-JB920 – 53 –– 54 – • WaveformsMDS-JB920 – 55 –– 56 – Page Page Page Page Page PageMDS-JB920 – 57 –– 58 – MDS-JB920 – 59 –– 60 – Page Page Page PageMDS-JB920 – 61 –– 62 – • Semiconductor Location – 63 –MDS-JB920 US, CND – 66 –MDS-JB920 US, CNDMDS-JB920 – 67 –– 68 – Page Page Page Page– 69 – 6-15.SCHEMATIC DIAGRAM - BD SWITCH SectionPRINTED WIRING BOARD – BD SWITCH Section – – 70 –CXD2654R – 71 –IC121 IC152 BH6511FS-E2IC100 – 72 –– MAIN Board – CXD8607NCXD8767N – 73 –IC200 IC700 IC300SN74HC153ANS LA56321 CHASSIS SECTION 56 SECTION EXPLODED VIEWS– 75 – 2 16 17 1859 58 – 76 –2 FRONT PANEL SECTION 63 223 207 203 225 – 77 –3MECHANISM SECTION MDM-5A 206 201254 – 78 –4BASE UNIT SECTION MBU-5A 252 – 79 – SECTION ELECTRICAL PARTS LISTAC BAT BD – 80 – DISP – 81 –MAIN – 82 –MAIN – 84 – MAIN– 85 – MAINMAIN SW VOL – 87 –9-922-869-11 MDS-JB920Sony Corporation Home A&V Products Company