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Sony MDS-JB920 service manual Specifications, Service Manual, Mini Disc Deck

Models: MDS-JB920

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MDS-JB920

MDS-JB920

SERVICE MANUAL

US Model

Canadian Model

AEP Model

UK Model

U.S. and foreign patents licensed form Dolby Laboratories Licensing Corporation.

Model Name Using Similar Mechanism	MDS-JE520

MD Mechanism Type	MDM-5A

Optical Pick-up Type	KMS-260A/J1N

SPECIFICATIONS

System	MiniDisc digital audio system
Disc	MiniDisc
Laser	Semiconductor laser (λ=780nm)
	Emission duration: continuous
Laser output	Less than 44.6 μW*
	* This output is the value measured at a
	distance of 200 mm from the objective lens
	surface on the Optical Pick-up Block with 7
	mm aperture.
Laser diode properties	Material: GaAIAs
Revolutions (CLV)	400 rpm to 900 rpm
Error correction	Advanced Cross Interleave Reed
	Solomon Code (A CIRC)
Sampling frequency	44.1 kHz
Coding	Adaptive Transform Acoustic Coding
	(ATRAC)
Modulation system	EFM (English-to-Fourteen Modulation)
Number fo channels	2 setero channels
Frequency response	5 to 20,000 Hz ±0.3 dB
Signal-to-noise retio	Over 100 dB during playback
Wow and flutter	Below measureble limit

Inputs

	jack	input	Rated		Minimum
	type	impedance	input		input
LINE (ANALOG)	phono	47 kilohms	500 mVrms		125 mVrms
IN	jacks
DIGITAL	Square	Optical wave
OPTICAL IN1	optical	length:	—		—
	connector	660 nm
	jack
DIGITAL	Square	Optical wave
OPTICAL IN2	optical	length:	—		—
	connector	660 nm
	jack
DIGITAL	Phono	75 ohms	0.5 Vp-p		—
COAXIAL IN	jack		±20%

Outputs
	jack type	Rated output		Load impedance
PHONES	Stereo	28 mW		32 ohms
	phone jack
LINE (ANALOG)	Phono	2 Vrms		Over
OUT	jacks	(at 50 kilohms)		10 kilohms

DIGIRAL	Square	–18 dBm		Optical wave
OPTICAL OUT	optical			length:
	connector			660 nm
	jack

DIGITAL	Phono	0.5 Vp-p		75 ohms
COAXIAL OUT	jack	(at 75 ohms)

MINI DISC DECK

MICROFILM

Image 1

Sony MDS-JB920 service manual Specifications, Service Manual, Mini Disc Deck, US Model Canadian Model AEP Model UK Model

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