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Sony MDS-JB920 service manual 37

Models: MDS-JB920

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	Pin No.	Pin Name	I/O	Function

	40	AVDDL	—	Power supply terminal (+5V) (for L-ch side D/A converter section, analog system)
	40	AVDDL	—	Not used (open)
				Not used (open)

	41	L1	O	L-ch PLM signal 1 output terminal Not used (open)

	42	VDD2	—	Power supply terminal (+5V) (for L-ch side D/A converter section, digital system)
	42	VDD2	—	Not used (open)
				Not used (open)

	43, 44	VDD1	—	Power supply terminal (+5V) (for A/D converter section, digital system)

	45	VSS1	—	Ground terminal (for A/D converter section, digital system)

	46	TEST2	I	Input terminal for the test (fixed at “L”)

	47	TEST3	I	Input terminal for the test (fixed at “L”)

	48	VSS1	—	Ground terminal (for A/D converter section, digital system)

	49	NU	—	Not used (open)

	50	NU	—	Not used (open)

	51	AVSS	—	Ground terminal (for A/D converter section, analog system)

	52	LVDD	—	Power supply terminal (+5V) (for A/D converter section, buffer system)

	53	LVSS	—	Ground terminal (for A/D converter section, buffer system)

	54	REFO	O	Reference voltage (+3.3V) output terminal (for A/D converter section)

	55	INLM	I	L-ch analog signal (+) input terminal

	56	INLP	I	L-ch analog signal (–) input terminal

– 37 –

Image 37

Sony MDS-JB920 service manual 37

Contents

SERVICE MANUAL SPECIFICATIONSMDS-JB920 MINI DISC DECK– 2 – SELF-DIAGNOSISFUNCTION– 3 – Items of Error History Mode Items and ContentsTable of Error Codes Selecting the Test Mode6.DIAGRAMS TABLE OF CONTENTSSECTION SERVICING NOTES DISASSEMBLYFlexible Circuit Board Repairing – 5 –Notes on chip component replacement ADVARSELJIG FOR CHECKING BD BOARD WAVEFORM Record Precedure – 7 –Display Precedure Forced Reset Checks Prior to Parts Replacement and Adjustments– 8 – ProcedureRetry Cause Display Mode – 9 –Precedure Fig. 1 Reading the Test Mode DisplayReading the Display – 10 –Hexadecimal nBinary Conversion Table – 11 – SECTION GENERALLOCATION OF CONTROLS • Front view • Rear view– 12 – – 13 – CASE – 14 –DISASSEMBLY SECTIONFRONT PANEL SECITON – 15 –MAIN BOARD MECHANISM SECTION MDM-5A – 16 –SLIDER CAM BASE UNIT MBU-5A,BD BOARD – 17 –SW BOARD, LOADING MOTOR M103 2. SETTING THE TEST MODE 1. PRECAUTIONS FOR USE OF TEST MODESECTION TEST MODE – 18 –5. SELECTING THE TEST MODE – 19 –5-1.Operating the Continuous Playback Mode – 20 –5-3. Non-VolatileMemory Mode EEP MODE 6. FUNCTIONS OF OTHER BUTTONS – 21 –7. TEST MODE DISPLAYS 4.Auto gain display Not used in servicingMEANINGS OF OTHER DISPLAYS – 22 –1.PARTS REPLACEMENT AND ADJUSTMENT SECTION ELECTRICAL ADJUSTMENTS– 23 – 4. PRECAUTIONS FOR ADJUSTMENTS 2. PRECAUTIONS FOR CHECKING LASER DIODE EMISSINONLaser power meter – 24 –6. CHECK PRIOR TO REPAIRS – 25 –6-1.Temperature Compensation Offset Check Checking Procedure6-5.C PLAY Checking MO Error Rate Check – 26 –CD Error Rate Check 6-4.Focus Bias Check9. TEMPERATURE COMPENSATION OFFSET ADJUTMENT 7. INITIAL SETTING OF ADJUSTMENT VALUE10. LASER POWER ADJUSTMENT – 27 –Specification 11. TRAVERSE ADJUSTMENTAdjusting Procedure Connection– 29 – 12.FOCUS BIAS ADJUSTMENT15.AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT 13.ERROR RATE CHECK– 30 – 14. FOCUS BIAS CHECK– 31 – 16. ADJUSTING POINTS AND CONNECTING POINTSBD BOARD SIDE A BD BOARD SIDE B– 32 – SECTION DIAGRAMS6-1.IC PIN FUNCTION DESCRIPTION •BD BOARD IC121 CXD2654R – 33 –– 34 – – 35 – •MAIN BOARD IC100 CXD8607N A/D CONVERTER – 36 –– 37 – – 38 – – 39 – MDS-JB920– 40 – – 41 – BLOCK DIAGRAM – SERVO Section –– 42 – MDS-JB920– 43 – 6-3.BLOCK DIAGRAM – MAIN Section –– 44 – MDS-JB920– 46 – – 45 –• Circuit Boards Location Note on Schematic Diagram– 47 – 6-5.PRINTED WIRING BOARDS – BD Section –– 48 – •See page 45 for Circuit Boards Location– 50 – – 49 –MDS-JB920 Page– 51 – 6-7.SCHEMATIC DIAGRAM – BD Section 2/2 – See•– 52 – MDS-JB920– 54 – – 53 –MDS-JB920 • Waveforms– 56 – – 55 –MDS-JB920 Page Page Page Page Page Page– 58 – – 57 –MDS-JB920 – 60 – – 59 –MDS-JB920 Page Page Page Page– 62 – – 61 –MDS-JB920 MDS-JB920 – 63 –• Semiconductor Location MDS-JB920 – 66 –US, CND US, CND– 68 – – 67 –MDS-JB920 Page Page Page PagePRINTED WIRING BOARD – BD SWITCH Section – 6-15.SCHEMATIC DIAGRAM - BD SWITCH Section– 69 – – 70 –IC121 – 71 –CXD2654R IC152 BH6511FS-E2– MAIN Board – – 72 –IC100 CXD8607NIC200 – 73 –CXD8767N SN74HC153ANS IC300IC700 LA5632– 75 – SECTION EXPLODED VIEWS1 CHASSIS SECTION 56 2 16 17 182 FRONT PANEL SECTION 63 – 76 –59 58 3MECHANISM SECTION MDM-5A – 77 –223 207 203 225 206 2014BASE UNIT SECTION MBU-5A 252 – 78 –254 AC BAT BD SECTION ELECTRICAL PARTS LIST– 79 – – 80 – – 81 – DISP– 82 – MAINMAIN MAIN – 84 –MAIN – 85 –MAIN – 87 – SW VOLSony Corporation MDS-JB9209-922-869-11 Home A&V Products Company