Sony MDS-JB920 service manual Specifications, MDS-JE520, MDM-5A

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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

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Contents MDS-JE520 SpecificationsMDM-5A General SELF-DIAGNOSIS FunctionItems of Error History Mode Items and Contents Diagrams Table of ContentsSection Servicing Notes Varning Flexible Circuit Board RepairingVaroitus IOP JIG for Checking BD Board WaveformRecord Precedure Forced Reset Checks Prior to Parts Replacement and AdjustmentsREC/PLAY Precedure Retry Cause Display ModeHexadecimal nBinary Conversion Table Location of Controls Section GeneralFront view Rear view Page Page Case Section DisassemblyMain Board Front Panel SecitonSlider CAM Mechanism Section MDM-5ASW BOARD, Loading Motor M103 Base Unit MBU-5A, BD BoardPrecautions for USE of Test Mode Section Test ModeSetting the Test Mode Exiting the Test ModeDisplay Contents Mark Group Selecting the Test ModeNon-Volatile Memory Mode EEP Mode Operating the Continuous Playback ModeMID Functions of Other Buttons Test Mode DisplaysAuto gain display Not used in servicing Detrack check display Not used in servicingMeanings of Other Displays Display Contents When Lit When OffParts Replacement and Adjustment Section Electrical AdjustmentsPrecautions for USE of Optical PICK-UP KMS-260A Precautions for Checking Laser Diode EmissinonPrecautions for Adjustments Laser power meterLaser Power Check Temperature Compensation Offset CheckCheck Prior to Repairs Traverse CheckCD Error Rate Check Play Checking MO Error Rate CheckFocus Bias Check Self-Recording/playback CheckTemperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser Power Adjustment Recording and Displaying the IOP InformationTraverse Adjustment Focus Bias Adjustment Auto Gain Control Output Level Adjustment Error Rate CheckCD Auto Gain Control Output Level Adjustment MO Auto Gain Control Output Level AdjustmentAdjusting Points and Connecting Points BD Board IC101 CXA2523AR RF AMP, FOCUS/TRACKING Error AMP Section DiagramsIC PIN Function Description Sens SrdtXrst SqsyXWE XrasMvci AsyoSfdr SrdrSprd SpfdMain Board IC100 CXD8607N A/D Converter VDD1 AvddlTEST2 LvddMain Board IC800 M30610MCA-264FP System Controller MDS-JB920 ∙ Signal Path Block Diagram Servo SectionREC Analog REC Digital∙ Signal Path Play Analog OUT Block Diagram Main SectionPlay Digital OUT Circuit Boards Location Printed Wiring Boards BD Section MDS-JB920 53 for Waveforms. See page 70 and 71 for IC Block Diagrams Schematic Diagram BD /2 SeeWaveforms BD board Main board Disp board MDS-JB920 MDS-JB920 MDS-JB920 MDS-JB920 Other layers pattern Side a US, CND Schematic Diagram Panel Section See page 54 for Waveforms Printed Wiring Board BD Switch Section Schematic Diagram BD Switch SectionIC Block Diagrams BD Board IC101 CXA2523ARIC152 BH6511FS-E2 IC121 CXD2654RIC101 CXA8054M Main Board IC100 CXD8607NIC203 CXA8042ASIC200 CXD8767N SN74HCU04ANS-E20 SN74HC153ANSChassis Section Section Exploded ViewsSupplied with RV760 Front Panel Section204 205 206 201209 4-988-466-21 Spring ELECTROSTATIC, Leaf Base Unit Section MBU-5A Section Electrical Parts List Diode TANTAL. ChipDiode F1J6TP CXA2523ARDisp Main C252 Mylar HZ7.5CP-TK HZS6C1LCXA8042AS SN74HC153ANS390 Coil with Core Vibrator Main PSWLED SEL6210S-TH10 Standby LED SEL6810A-TH10 Mega Control TransistorSW VOL Sony Corporation