Sony MDS-JA555ES Service Manual

SERVICE MANUAL
MINIDISC DECK
MICROFILM
— Continued on next page —
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
Model Name Using Similar Mechanism MDS-JA20ES
MD Mechanism Type MDM-6A
Base Unit Type MBU-5C
Optical Pick-up Type KMS-260B/J1N
MDS-JA555ES
U.S. and foreign patents licensed from Dolby Laboratories
Licensing Corporation.
Photo : GOLD
System MiniDisc digital audio system
Disc MiniDisc
Laser Semiconductor laser (λ=780 nm)
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: 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)
Modulation system EFM (Eight-to-Fourteen Modulation)
Number of channels 2 stereo channels
Frequency response 5 Hz to 20,000 Hz ± 0.3 dB
Signal-to-noise ratio Over 105 dB during playback
Wow and flutter Below measurable limit
Inputs
Jack Input Rated Minimum
type impedance input input
LINE Phono
(ANALOG) jacks 47 kΩ 500 mVrms 125 mVrms
IN
DIGITAL Square Optical wave
IN optical length
OPT1 connector 660 nm
jack
DIGITAL Square Optical wave
IN optical length
OPT2 connector 660 nm
jack
DIGITAL Phono 0.5 Vp-p
IN jack 75 Ω ±20%
COAXIAL

Sony MDS-JA555ES Specifications

General

Type	MiniDisc Deck
Number of Channels	2
Sampling Frequency	44.1 kHz
Sampling Rate Converter	Yes
Remote Control	Yes
Dynamic Range	100 dB
Recording System	ATRAC
Frequency Response	5 Hz - 20 kHz
Digital Inputs	Coaxial, Optical
Digital Outputs	Optical x 1, Coaxial x 1
Analog Inputs	RCA
Analog Outputs	RCA
ATRAC Version	ATRAC Type-R
Wow and Flutter	Unmeasurable

Summary

SAFETY CHECK-OUT

AC Leakage Test

Procedures and standards for measuring AC leakage current.

General Safety Warnings

Crucial warnings regarding electrical safety and battery handling.

DISASSEMBLY PROCEDURES

TEST MODE OPERATIONS

Precautions for Test Mode Use

Important safety and operational notes before entering test mode.

Test Mode Entry and Exit Procedures

Methods for entering, exiting, and operating the test mode.

ELECTRICAL ADJUSTMENTS PROCEDURES

Pre-Repair Checks and Adjustments

Checks to perform before replacing parts or making adjustments.

On Part Replacement and Adjustment

Flowchart for adjustments based on replaced parts.

Laser Power Adjustment

Steps to adjust laser power output.

DIAGRAMS AND VIEWS

Waveforms

Visual representations of key waveforms.

IC Block Diagrams

Block diagrams of key integrated circuits.

EXPLODED VIEWS

SELF-DIAGNOSIS FUNCTION

Error Code Troubleshooting

Table detailing error codes and their causes/remedies.

Operating Error History Mode

Step-by-step guide to access and use the error history display mode.

BD BOARD WAVEFORM CHECK TOOL

IOP DATA HANDLING FOR OPTICAL PICK-UP REPLACEMENT

Recording IOP Data

Steps to save IOP data from the optical pick-up to memory.

Displaying IOP Data

PRE-REPAIR CHECKS AND ADJUSTMENTS

Laser Power Check

Traverse Check

Focus Bias Check

Procedure for checking focus bias tolerance.

SETTING THE CLOCK

SELECTING TEST MODES

CONTINUOUS PLAYBACK MODE OPERATION

CONTINUOUS RECORDING MODE OPERATION

TEST MODE DISPLAY INTERPRETATION

Interpreting Test Mode Displays

PRECAUTIONS FOR ELECTRICAL ADJUSTMENTS

Laser Diode Emission Precautions

Optical Pick-up Handling Precautions

ADJUSTMENT PROCEDURES

Laser Power Check

Procedure for checking laser power output.

Traverse Check

Procedure for checking traverse waveforms.

ERROR RATE CHECK

AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT

IOP INFORMATION RECORDING AND DISPLAY

TEMPERATURE COMPENSATION OFFSET ADJUSTMENT

LASER POWER ADJUSTMENT

TRAVERSE ADJUSTMENT

FOCUS BIAS ADJUSTMENT

BLOCK DIAGRAMS

CIRCUIT BOARD LOCATION

PRINTED WIRING BOARD - BD SECTION

SCHEMATIC DIAGRAM - BD SECTION (1/2)

SCHEMATIC DIAGRAM - BD SECTION (2/2)

PRINTED WIRING BOARD - AD SECTION

SCHEMATIC DIAGRAM - AD SECTION (1/2)

SCHEMATIC DIAGRAM - AD SECTION (2/2)

SCHEMATIC DIAGRAM - DA SECTION (1/2)

PRINTED WIRING BOARD - DA SECTION

SCHEMATIC DIAGRAM - DA SECTION (2/2)

WAVEFORMS

IC BLOCK DIAGRAMS

IC PIN FUNCTION DESCRIPTIONS