Manuals / Sony / Home Audio / Stereo System

Sony MDS-JB920 service manual 15, Front Panel Seciton, Main Board

Models: MDS-JB920

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FRONT PANEL SECITON	1 connector
	1 connector
	(CN790)
4 claw

3five screws (BVTP3 × 8)

MAIN BOARD

1 connector (CN200)

3 two screws (BVTP3 × 8)

2wire (flat type) (23 core) (CN400)

4MAIN board

2wire (flat type) (21 core) (MAIN-DISP)

(CN800)

1 two connectors (CN801)

4 claw

5front panel section

2wire (flat type) (21 core) (MAIN-BD) (CN402)

2 wire (flat type) (21 core) (MAIN-DISP) (CN800)

1 connector (CN200)

3 three screws (BVTP3 × 8)

1 two connectors (CN100, 801)

3 seven screws (BVTP3 × 8)

– 15 –

Page 15

Image 15

Sony MDS-JB920 service manual 15, Front Panel Seciton, Main Board

Contents

MINI DISC DECK SPECIFICATIONSSERVICE MANUAL MDS-JB920– 2 – SELF-DIAGNOSISFUNCTIONSelecting the Test Mode Items of Error History Mode Items and Contents– 3 – Table of Error CodesDISASSEMBLY TABLE OF CONTENTS6.DIAGRAMS SECTION SERVICING NOTESADVARSEL – 5 –Flexible Circuit Board Repairing Notes on chip component replacementJIG FOR CHECKING BD BOARD WAVEFORM – 7 – Record PrecedureDisplay Precedure Procedure Checks Prior to Parts Replacement and AdjustmentsForced Reset – 8 –Fig. 1 Reading the Test Mode Display – 9 –Retry Cause Display Mode Precedure– 10 – Reading the DisplayHexadecimal nBinary Conversion Table • Front view • Rear view SECTION GENERAL– 11 – LOCATION OF CONTROLS– 12 – – 13 – SECTION – 14 –CASE DISASSEMBLY– 15 – FRONT PANEL SECITONMAIN BOARD – 16 – MECHANISM SECTION MDM-5ASLIDER CAM – 17 – BASE UNIT MBU-5A,BD BOARDSW BOARD, LOADING MOTOR M103 – 18 – 1. PRECAUTIONS FOR USE OF TEST MODE2. SETTING THE TEST MODE SECTION TEST MODE5. SELECTING THE TEST MODE – 19 –– 20 – 5-1.Operating the Continuous Playback Mode5-3. Non-VolatileMemory Mode EEP MODE 4.Auto gain display Not used in servicing – 21 –6. FUNCTIONS OF OTHER BUTTONS 7. TEST MODE DISPLAYSMEANINGS OF OTHER DISPLAYS – 22 –SECTION ELECTRICAL ADJUSTMENTS 1.PARTS REPLACEMENT AND ADJUSTMENT– 23 – – 24 – 2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSINON4. PRECAUTIONS FOR ADJUSTMENTS Laser power meterChecking Procedure – 25 –6. CHECK PRIOR TO REPAIRS 6-1.Temperature Compensation Offset Check6-4.Focus Bias Check – 26 –6-5.C PLAY Checking MO Error Rate Check CD Error Rate Check– 27 – 7. INITIAL SETTING OF ADJUSTMENT VALUE9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT 10. LASER POWER ADJUSTMENTConnection 11. TRAVERSE ADJUSTMENTSpecification Adjusting Procedure– 29 – 12.FOCUS BIAS ADJUSTMENT14. FOCUS BIAS CHECK 13.ERROR RATE CHECK15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT – 30 –BD BOARD SIDE B 16. ADJUSTING POINTS AND CONNECTING POINTS– 31 – BD BOARD SIDE ASECTION DIAGRAMS – 32 –6-1.IC PIN FUNCTION DESCRIPTION •BD BOARD IC121 CXD2654R – 33 –– 34 – – 35 – •MAIN BOARD IC100 CXD8607N A/D CONVERTER – 36 –– 37 – – 38 – MDS-JB920 – 39 –– 40 – MDS-JB920 BLOCK DIAGRAM – SERVO Section –– 41 – – 42 –MDS-JB920 6-3.BLOCK DIAGRAM – MAIN Section –– 43 – – 44 –Note on Schematic Diagram – 45 –– 46 – • Circuit Boards Location•See page 45 for Circuit Boards Location 6-5.PRINTED WIRING BOARDS – BD Section –– 47 – – 48 –Page – 49 –– 50 – MDS-JB920MDS-JB920 6-7.SCHEMATIC DIAGRAM – BD Section 2/2 – See•– 51 – – 52 –• Waveforms – 53 –– 54 – MDS-JB920Page Page Page Page Page Page – 55 –– 56 – MDS-JB920– 57 – – 58 –MDS-JB920 Page Page Page Page – 59 –– 60 – MDS-JB920– 61 – – 62 –MDS-JB920 – 63 – MDS-JB920• Semiconductor Location US, CND – 66 –MDS-JB920 US, CNDPage Page Page Page – 67 –– 68 – MDS-JB920– 70 – 6-15.SCHEMATIC DIAGRAM - BD SWITCH SectionPRINTED WIRING BOARD – BD SWITCH Section – – 69 –IC152 BH6511FS-E2 – 71 –IC121 CXD2654RCXD8607N – 72 –– MAIN Board – IC100– 73 – IC200CXD8767N LA5632 IC300SN74HC153ANS IC7002 16 17 18 SECTION EXPLODED VIEWS– 75 – 1 CHASSIS SECTION 56– 76 – 2 FRONT PANEL SECTION 6359 58 206 201 – 77 –3MECHANISM SECTION MDM-5A 223 207 203 225– 78 – 4BASE UNIT SECTION MBU-5A 252254 SECTION ELECTRICAL PARTS LIST AC BAT BD– 79 – – 80 – – 81 – DISP– 82 – MAINMAIN MAIN – 84 –MAIN – 85 –MAIN – 87 – SW VOLHome A&V Products Company MDS-JB920Sony Corporation 9-922-869-11