Manuals / Sony / Home Audio / Stereo System

Sony MDS-JB920 service manual 35

Models: MDS-JB920

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Pin No.	Pin Name	I/O	Function

91	SRDR	O	Sled servo drive PWM signal (–) output to the BH6511FS (IC152)

92	SFDR	O	Sled servo drive PWM signal (+) output to the BH6511FS (IC152)

93	SPRD	O	Spindle servo drive PWM signal (–) output to the BH6511FS (IC152)

94	SPFD	O	Spindle servo drive PWM signal (+) output to the BH6511FS (IC152)

95	FGIN	I (S)

96	TEST1	I	Input terminal for the test (fixed at “L”)

97	TEST2	I
97	TEST2	I

98	TEST3	I

99	DVSS	—	Ground terminal (digital system)

100	EFMO	O	EFM signal output terminal when recording mode

* I (S) stands for schmitt input, I (A) for analog input, O (3) for 3-state output, and O (A) for analog output in the column I/O.

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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 Display Precedure – 7 –Record Precedure Procedure Checks Prior to Parts Replacement and AdjustmentsForced Reset – 8 –Fig. 1 Reading the Test Mode Display – 9 –Retry Cause Display Mode PrecedureHexadecimal nBinary Conversion Table – 10 –Reading the Display • Front view • Rear view SECTION GENERAL– 11 – LOCATION OF CONTROLSPage – 13 – SECTION – 14 –CASE DISASSEMBLYMAIN BOARD – 15 –FRONT PANEL SECITON SLIDER CAM – 16 –MECHANISM SECTION MDM-5A SW BOARD, LOADING MOTOR M103 – 17 –BASE UNIT MBU-5A,BD BOARD – 18 – 1. PRECAUTIONS FOR USE OF TEST MODE2. SETTING THE TEST MODE SECTION TEST MODE5. SELECTING THE TEST MODE – 19 –5-3. Non-VolatileMemory Mode EEP MODE – 20 –5-1.Operating the Continuous Playback Mode 4.Auto gain display Not used in servicing – 21 –6. FUNCTIONS OF OTHER BUTTONS 7. TEST MODE DISPLAYSMEANINGS OF OTHER DISPLAYS – 23 – SECTION ELECTRICAL ADJUSTMENTS1.PARTS REPLACEMENT AND ADJUSTMENT – 24 – 2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSINON4. PRECAUTIONS FOR ADJUSTMENTS Laser power meter6-2.Laser Power Check – 25 –6. CHECK PRIOR TO REPAIRS Checking Procedure6-4.Focus Bias Check – 26 –6-5.C PLAY Checking MO Error Rate Check CD Error Rate Check8. RECORDING AND DISPLAYING THE IOP INFORMATION 7. INITIAL SETTING OF ADJUSTMENT VALUE10. LASER POWER ADJUSTMENT – 27 –Connection 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 A6-1.IC PIN FUNCTION DESCRIPTION SECTION DIAGRAMS– 32 – BD BOARD IC121 CXD2654R – 33 –– 34 – – 35 – •MAIN BOARD IC100 CXD8607N A/D CONVERTER – 36 –– 37 – – 38 – – 40 – MDS-JB920– 39 – 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-JB920MDS-JB920 – 57 –– 58 – Page Page Page Page – 59 –– 60 – MDS-JB920MDS-JB920 – 61 –– 62 – • Semiconductor Location – 63 –MDS-JB920 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 – IC100CXD8767N – 73 –IC200 LA5632 IC300SN74HC153ANS IC7002 16 17 18 SECTION EXPLODED VIEWS– 75 – 1 CHASSIS SECTION 5659 58 – 76 –2 FRONT PANEL SECTION 63 206 201 – 77 –3MECHANISM SECTION MDM-5A 223 207 203 225254 – 78 –4BASE UNIT SECTION MBU-5A 252 – 79 – SECTION ELECTRICAL PARTS LISTAC BAT BD Page – 81 – DISP– 82 – MAINMAIN MAIN – 84 –MAIN – 85 –MAIN – 87 – SW VOLHome A&V Products Company MDS-JB920Sony Corporation 9-922-869-11