Manuals / Sony / Home Audio / Stereo System

Sony MDS-JB920 service manual 57, 58

Models: MDS-JB920

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MDS-JB920

6-9. SCHEMATIC DIAGRAM – MAIN Section (2/3) – See• page 72 and 73 for IC Block Diagrams.

(Page 51)

(Page 56)

(Page 59)

Note:

•Voltages and waveforms are dc with respect to ground in playback mode.

no mark : PB

∗: Impossible to measure

The components identified by mark !or dotted line with mark !are critical for safety.

Replace only with part number specified.

Les composants identifiés par une marque !sont critiques pour la sécurité. Ne les remplacer que par une piéce portant le numéro spécifié.

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Contents

SPECIFICATIONS SERVICE MANUALMDS-JB920 MINI DISC DECKSELF-DIAGNOSISFUNCTION – 2 –Items of Error History Mode Items and Contents – 3 –Table of Error Codes Selecting the Test ModeTABLE OF CONTENTS 6.DIAGRAMSSECTION SERVICING NOTES DISASSEMBLY– 5 – Flexible Circuit Board RepairingNotes on chip component replacement ADVARSELJIG FOR CHECKING BD BOARD WAVEFORM – 7 – Record PrecedureDisplay Precedure Checks Prior to Parts Replacement and Adjustments Forced Reset– 8 – Procedure– 9 – Retry Cause Display ModePrecedure Fig. 1 Reading the Test Mode Display– 10 – Reading the DisplayHexadecimal nBinary Conversion Table SECTION GENERAL – 11 –LOCATION OF CONTROLS • Front view • Rear viewPage – 13 – – 14 – CASEDISASSEMBLY SECTION– 15 – FRONT PANEL SECITONMAIN BOARD – 16 – MECHANISM SECTION MDM-5ASLIDER CAM – 17 – BASE UNIT MBU-5A,BD BOARDSW BOARD, LOADING MOTOR M103 1. PRECAUTIONS FOR USE OF TEST MODE 2. SETTING THE TEST MODESECTION TEST MODE – 18 –– 19 – 5. SELECTING THE TEST MODE– 20 – 5-1.Operating the Continuous Playback Mode5-3. Non-VolatileMemory Mode EEP MODE – 21 – 6. FUNCTIONS OF OTHER BUTTONS7. TEST MODE DISPLAYS 4.Auto gain display Not used in servicingMEANINGS OF OTHER DISPLAYS SECTION ELECTRICAL ADJUSTMENTS 1.PARTS REPLACEMENT AND ADJUSTMENT– 23 – 2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSINON 4. PRECAUTIONS FOR ADJUSTMENTSLaser power meter – 24 –– 25 – 6. CHECK PRIOR TO REPAIRSChecking Procedure 6-2.Laser Power Check– 26 – 6-5.C PLAY Checking MO Error Rate CheckCD Error Rate Check 6-4.Focus Bias Check7. INITIAL SETTING OF ADJUSTMENT VALUE 10. LASER POWER ADJUSTMENT– 27 – 8. RECORDING AND DISPLAYING THE IOP INFORMATION11. TRAVERSE ADJUSTMENT SpecificationAdjusting Procedure Connection12.FOCUS BIAS ADJUSTMENT – 29 –13.ERROR RATE CHECK 15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT– 30 – 14. FOCUS BIAS CHECK16. ADJUSTING POINTS AND CONNECTING POINTS – 31 –BD BOARD SIDE A BD BOARD SIDE BSECTION DIAGRAMS – 32 –6-1.IC PIN FUNCTION DESCRIPTION – 33 – BD BOARD IC121 CXD2654R– 34 – – 35 – – 36 – •MAIN BOARD IC100 CXD8607N A/D CONVERTER– 37 – – 38 – MDS-JB920 – 39 –– 40 – BLOCK DIAGRAM – SERVO Section – – 41 –– 42 – MDS-JB9206-3.BLOCK DIAGRAM – MAIN Section – – 43 –– 44 – MDS-JB920– 45 – – 46 –• Circuit Boards Location Note on Schematic Diagram6-5.PRINTED WIRING BOARDS – BD Section – – 47 –– 48 – •See page 45 for Circuit Boards Location– 49 – – 50 –MDS-JB920 Page6-7.SCHEMATIC DIAGRAM – BD Section 2/2 – See• – 51 –– 52 – MDS-JB920– 53 – – 54 –MDS-JB920 • Waveforms– 55 – – 56 –MDS-JB920 Page Page Page Page Page Page– 57 – – 58 –MDS-JB920 – 59 – – 60 –MDS-JB920 Page Page Page Page– 61 – – 62 –MDS-JB920 – 63 – MDS-JB920• Semiconductor Location – 66 – MDS-JB920US, CND US, CND– 67 – – 68 –MDS-JB920 Page Page Page Page6-15.SCHEMATIC DIAGRAM - BD SWITCH Section PRINTED WIRING BOARD – BD SWITCH Section –– 69 – – 70 –– 71 – IC121CXD2654R IC152 BH6511FS-E2– 72 – – MAIN Board –IC100 CXD8607N– 73 – IC200CXD8767N IC300 SN74HC153ANSIC700 LA5632SECTION EXPLODED VIEWS – 75 –1 CHASSIS SECTION 56 2 16 17 18– 76 – 2 FRONT PANEL SECTION 6359 58 – 77 – 3MECHANISM SECTION MDM-5A223 207 203 225 206 201– 78 – 4BASE UNIT SECTION MBU-5A 252254 SECTION ELECTRICAL PARTS LIST AC BAT BD– 79 – Page DISP – 81 –MAIN – 82 –MAIN – 84 – MAIN– 85 – MAINMAIN SW VOL – 87 –MDS-JB920 Sony Corporation9-922-869-11 Home A&V Products Company