Manuals / Sony / Home Audio / Stereo System

Sony MDS-JB920 Sony Corporation, 9-922-869-11, Home A&V Products Company, 98E0572-1, Shibaura

Models: MDS-JB920

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MDS-JB920

	Sony Corporation	98E0572-1
9-922-869-11	Home A&V Products Company	Printed in Japan © 1998. 5
9-922-869-11	Home A&V Products Company	Published by Quality Assurance Dept.
	– 88 –	Published by Quality Assurance Dept.
	– 88 –	(Shibaura)

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Image 72

Sony MDS-JB920 Sony Corporation, 9-922-869-11, Home A&V Products Company, 98E0572-1, Printed in Japan 1998, Shibaura

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 view– 12 – – 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 servicing– 22 – MEANINGS OF OTHER DISPLAYSSECTION 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 REPAIRS6-1.Temperature Compensation Offset Check Checking Procedure– 26 – 6-5.C PLAY Checking MO Error Rate CheckCD Error Rate Check 6-4.Focus Bias Check7. INITIAL SETTING OF ADJUSTMENT VALUE 9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT10. LASER POWER ADJUSTMENT – 27 –11. 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 – – 80 – DISP – 81 –MAIN – 82 –MAIN – 84 – MAIN– 85 – MAINMAIN SW VOL – 87 –MDS-JB920 Sony Corporation9-922-869-11 Home A&V Products Company

Sony Corporation

9-922-869-11

Home A&V Products Company

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