Sony MDS-JE780 Service Manual

MDS-JE780
SPECIFICATIONS
SERVICE MANUAL
MINIDISC DECK
Model Name Using Similar Mechanism MDS-JE480
MD Mechanism Type MDM-7S1A
Optical Pick-up Type KMS-260B/260E
AEP Model
UK Model
E Model
US and foreign patents licensed form Dolby Laboratories
Licensing Corporation.
Sony Corporation
Home Audio Division
Published by Sony Techno Create Corporation
Ver. 1.4 2006.12
System MiniDisc digital audio system
Disc MiniDisc
Laser Semiconductor laser
(λ = 780 nm)
Emission duration: continuous
Laser output MAX 44.6 µW
1
)
1) This output is the value measured at a distance of 200 mm from
the objective lens surface on theOptical 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
Inputs
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%
Outputs
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)
General
Power requirements
European model: 230 V AC, 50/60 Hz
Other model: 110 – 120/220 – 240 V AC, 50/60 Hz
Adjustable with voltage selector
Power consumption 15 W (0.4 W in standby mode)
Dimensions (approx.) 430 x 95 x 285 mm (w/h/d) incl.
projecting parts and controls
Mass (approx.) 3.1 kg
Supplied accessories
Audio connecting cords (2)
Optical cable (1)
OpenMG Jukebox CD-ROM (1)
Operating instructions for OpenMG Jukebox (1)
Remote commander (remote) (1)
R6 (size-AA) batteries (2)
USB cable (1)
Instruction manual
Design and specifications are subject to change without notice.
9-874-014-05
2006L02-1
© 2006.12

Sony MDS-JE780 Specifications

General

Brand	Sony
Model	MDS-JE780
Category	MiniDisc Player
Language	English

Summary

SAFETY PRECAUTIONS

Optical Pick-up and Laser Handling

Laser Radiation Warning

Warning about invisible laser radiation when safeguards are defeated.

Safety-Related Component Warning

Identifies critical components for safe operation and replacement.

SELF-DIAGNOSIS FUNCTION

Error Code Interpretation

Explains causes and remedies for self-diagnosis error codes.

Error History Display Mode Procedure

Steps to enter and use the self-diagnosis error history display mode.

SERVICING NOTES

BD Board Waveform Check Jig

Iop Data Recording and Display Post Replacement

Procedure for recording and displaying Iop data after optical pick-up replacement.

PRE-REPLACEMENT CHECKS AND RESET

Checks Prior to Parts Replacement

Checks to determine faulty locations before replacement.

Forced Reset Procedure

Mechanism Deck Replacement Notes

Notes on replacing the BD board or MD mechanism deck.

DISASSEMBLY PROCEDURES

Disassembly Overview and Flow

Outlines the sequence for disassembling the unit and general steps.

TEST MODE OPERATIONS

Precautions for Test Mode Use

General precautions before entering and using test modes.

Laser Emission and Operating Buttons

Test Mode Setting Methods

Describes the methods to enter the test mode.

Test Mode Exit Procedure

Test Mode Selection

ELECTRICAL ADJUSTMENTS

Pre-Adjustment Checks

Guides checks before replacing parts and outlines the adjustment flowchart.

Core Adjustment Procedures

Covers key adjustments like Temp Comp, Laser Power, Traverse, Focus Bias, Auto Gain.

Data Handling and Diagnostic Checks

Covers Iop NV Save, Auto Check, and error display modes.

PRE-REPAIR CHECKS

Using Continuously Recorded Disc

Temperature Compensation Offset Check

Checks temperature compensation offset.

Laser Power Check

Checks the laser power output.

Iop Compare

Compares current Iop with reference Iop.

AUTO CHECK AND TRAVERSE CHECK

Auto Check Procedure

Steps for performing the Auto Check.

Traverse Check Procedure

Procedure for checking traverse waveforms.

FOCUS BIAS AND PLAYBACK CHECKS

C PLAY Check (MO/CD Error Rate)

Self-Recording/playback Check

Initial Setting of Adjustment Value

Procedure for setting initial adjustment values.

Iop INFORMATION AND LASER POWER ADJUSTMENT

Iop Information Recording Procedure

Iop Information Display Procedure

Temperature Compensation Offset Adjustment

Procedure for adjusting temperature compensation offset.

Laser Power Adjustment Procedure

Procedure for adjusting laser power output.

TRAVERSE AND Iop NV SAVE ADJUSTMENTS

Iop NV SAVE Procedure

Saves Iop reference values to non-volatile memory.

Traverse Adjustment Procedure

Procedure for adjusting traverse mechanism settings.

FOCUS BIAS AND ERROR RATE ADJUSTMENTS

Focus Bias Adjustment Procedure

Procedure for adjusting focus bias.

CD Error Rate Check

MO Error Rate Check

FOCUS BIAS CHECK AND AUTO GAIN ADJUSTMENTS

Focus Bias Check Procedure

Procedure for checking focus bias.

CD Auto Gain Control Output Level Adjustment

Adjusts CD auto gain control output level.

MO Auto Gain Control Output Level Adjustment

Adjusts MO auto gain control output level.

DIAGRAMS

Circuit Boards Location

BD Section Block Diagram

Main Section Block Diagram

BD Board Printed Wiring

BD Section Schematic

Schematic diagram of the BD section (part 1).

MAIN SECTION DIAGRAMS

Main Section Schematic (1/2)

Schematic diagram of the Main section (part 1).

Main Section Schematic (2/2)

Schematic diagram of the Main section (part 2).

Main Section Printed Wiring

DISPLAY AND USB SECTION DIAGRAMS

Display Section Printed Wiring

Display Section Schematic

Schematic diagram of the Display section.

USB/Power Section Printed Wiring

USB/Power Section Schematic

Schematic diagram of the USB/Power section.

IC PIN FUNCTION DESCRIPTION

IC101 CXA2523AR Pin Functions

IC201 CXD2664R Pin Functions

IC BLOCK DIAGRAMS

IC101 CXA2523AR Block Diagram

IC201 CXD2664R Block Diagram

EXPLODED VIEWS

Chassis Section-1 Exploded View

Chassis Section-2 Exploded View

Front Panel Section Exploded View

Mechanism Section-1 Exploded View

Mechanism Section-2 Exploded View

ELECTRICAL PARTS LIST