Sony MDS-JE770 specifications Specifications, 873-890-11, MDS-S50, MDM-7A

Page 1

MDS-JE770

SERVICE MANUAL

AEP Model

UK Model

E Model

Ver 1.0 2001. 05

Foreign patents licensed form Dolby Laboratories Licensing Corporation.

Model Name Using Similar Mechanism	MDS-S50

MD Mechanism Type	MDM-7A

Optical Pick-up Type	KMS-260B/260E

SPECIFICATIONS

System	MiniDisc digital audio
	system
Disc	MiniDisc
Laser	Semiconductor laser
	( λ = 780 nm) Emission
	duration: continuous
Laser output	MAX 44.6 ∝W1)

1)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	Material: GaAlAs
Revolutions (CLV)	400 rpm to 900 rpm
Error correction	ACIRC (Advanced Cross
	Interleave Reed Solomon
	Code)
Sampling frequency	44.1 kHz
Coding	ATRAC (Adaptive
	TRansform Acoustic
	Coding)/ATRAC 3
Modulation system	EFM (Eight-to-Fourteen
	Modulation)
Number of channels	2 stereo channels
Frequency response	5 to 20,000 Hz ±0.3 dB
Signal-to-noise ratio	Over 98 dB during play
Wow and flutter	Below measurable limit

I npu ts

ANALOG IN	Jack type: phono
	Impedance: 47 kilohms
	Rated input: 500 mVrms
	Minimum input:
	125 mVrms
DIGITAL OPTICAL IN	Connector type: square
	optical
	Impedance: 660 nm
	(optical wave length)
DIGITAL COAXIAL IN	(European model only)
	Jack type: phono
	Impedance: 75 ohms
	Rated input: 0.5 Vp-p,
	±20 %

Ou tputs

PHONES	Jack type: stereo phone
	Rated output: 28 mW
	Load impedance: 32 ohms
ANALOG OUT	Jack type: phono
	Rated output: 2 Vrms (at
	50 kilohms)
	Load impedance: over
	10 kilohms

DIGITAL OPTICAL OUT

Connector type: square optical

Rated output: –18 dBm

Load impedance: 660 nm (optical wave length)

— Continued on next page —

MINIDISC DECK

9-873-890-11	Sony Corporation
2001E0200-1	Home Audio Company
© 2001.5	Shinagawa Tec Service Manual Production Group

Image 1

Contents 873-890-11 SpecificationsMDS-S50 MDM-7ASupplied accessories Genera l Power requirementsMDS-JE770 SELF-DIAGNOSIS FunctionItems of Error History Mode Items and Contents Disassembly Table of ContentsDiagrams Exploded ViewsFlexible Circuit Board Repairing MDS-JE770 Section Service NotesIOP JIG for Checking BD Board WaveformRecord Precedure Optical PICK-UP Block Type Discrimination KSN-260EForced Reset Checks Prior to Parts Replacement and AdjustmentsMain Board Component Side Bit Binary Retry Cause Display ModeHigher Bits Lower Bits Hexa Details Bit When BinaryHexadecimal Binary Button Descriptions MDS-JE770 Section GeneralDisassembly Flow MDS-JE770 Section DisassemblyFront Panel Section Two screws Main BoardOver Light Head HR901, BD Board Mechanism Deck Section MDM-7ALoading Motor Assy M103 Holder AssyOptical PICK-UP Sled Motor Assy M102, SliderSpindle Moter Assy M101 Precautions for USE of Test Mode MDS-JE770 Section Test ModeSetting the Test Mode Exiting the Test ModeSelecting the Test Mode MENU/NO Operating the Continuous Playback ModeMode display Test Mode DisplaysError rate display Functions of Other ButtonsMeanings of Other Displays When Memory NG is DisplayedAutomatic SELF-DIAGNOSIS Function InformationParts Replacement and Adjustment MDS-JE770 Section Electrical AdjustmentsCheck before replacement Auto Gain Control Output Level Adjustment flowPrecautions for USE of Optical PICK- UP KMS-260B/260E Precautions for Checking Laser Diode EmissionPrecautions for Adjustments Temp AdjustChecks Prior to Repairs Using the Continuously Recorded DiscOther Checks Auto CheckTraverse Check Traverse WaveformCD Error Rate Check Play Check MO Error Rate CheckFocus Bias Check Self-Recording/playback CheckTemperature Compensation Offset Adjutment Initial Setting of Adjustment ValueLaser Power Adjustment Iop NV Save Traverse AdjustmentFocus 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 Circuit Boards Location MDS-JE770 Section DiagramsFor printed wiring boards For schematic diagramsBD Board Main BoardIC171 Block Diagrams BD SectionIC190 IC360 2/2 Main SectionIC1 2/2 Semiconductor SemiconductorOVEROptical Pick UP Block Write HeadBoard Board Main Main Schematic Diagram Main /2 See page 51 for IC Block Diagrams IC1 Model is printed on diagramKB Board Display BoardKEY-SW Board HP BoardLED Drive Schematic Diagram Display SectionC951 C952 RY910D910 CN921 C924 LF900 C910Main Schematic Diagram Power SectionIC101 CXA2523AR BD Board IC Block DiagramsIC500 AK4524 Main Board IC101 CXA2523AR RF Amplifier BD Board IC PIN Function DescriptionPin No Pin Name Description Pin No Pin Name Desription Asyo MvciAsyi AvddFfdr TfdrFrdr FS4ADA.RESET IIC PowerFldt FlckEPN ADA. LatchDINT1/H Clip ProtectSTB TimerBeep SW REC FlcsVDISP1 ResetVFL1 OSC0Chassis Section Section Exploded ViewsNot supplied Supplied with J790 FL750 With RV790 FL750 1-517-987-11 Indicator TUBE, FluorescentMechanism MDM-7A Motor ASSY, Spindle HEAD, Over LightMotor ASSY, Sled Motor ASSY, LoadingMDS-JE770 Section Electrical Parts List Metal Chip SwitchJumper Resistor ShortMDS-JE770 Display HP KB KEY-SW KEY-SW Main MDS-JE770 Main 2SD2144S-TP-UVW Resistor VOL-SEL MDS-JE770 Main PTMemo MDS-JE770 Revision History