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Sony MDS-JB920 Service Manual

Sony MDS-JB920
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MICROFILM
SERVICE MANUAL
MINI DISC DECK
US Model
Canadian Model
AEP Model
UK Model
SPECIFICATIONS
MDS-JB920
Model Name Using Similar Mechanism MDS-JE520
MD Mechanism Type MDM-5A
Optical Pick-up Type KMS-260A/J1N
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
U.S. and foreign patents licensed form Dolby Laboratories
Licensing Corporation.
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)

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Sony MDS-JB920 Specifications

General IconGeneral
TypeMiniDisc Player
Signal-to-Noise Ratio100 dB
Sampling Frequency44.1 kHz
Digital InputOptical, Coaxial
Digital OutputOptical, Coaxial
Analog InputRCA
Analog OutputRCA
Sampling Rate ConverterYes
Control A1IIYes
Date of Introduction1998
Frequency Response20 Hz - 20 kHz
Recording SystemATRAC

Summary

Specifications Overview

Inputs Specifications

Details input signal types, impedance, and rated input for the audio system.

Outputs Specifications

Details output signal types, load impedance, and rated output for the audio system.

Self-Diagnosis Function

Self-Diagnosis Function Overview

Describes the deck's diagnostic display showing condition and messages.

Error History Display Mode Procedure

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

Error History Mode Details

Error History Display Items

Details of displays like total rec, total play, retry err, total err, err history.

Table of Error Codes

Lists error codes and their corresponding error details for diagnosis.

SECTION 1 SERVICING NOTES

Safety Check-Out Procedures

Essential safety checks before releasing the unit to the customer.

Leakage Test Procedure

Method for measuring and ensuring AC leakage does not exceed limits.

Model Identification Details

Information on identifying different model versions and part numbers.

Safety Precautions and Warnings

Laser Radiation and Battery Handling Safety

Cautions regarding laser exposure and battery replacement hazards.

Component Replacement and Repair Safety

Guidelines for safe repair, including flexible circuit board and chip component handling.

BD Board Waveform Jig

Jig for BD Board Waveform Checking

Description and use of a special jig for checking BD board waveforms.

IOP Data Recording and Display

Recording IOP Data

Procedure to record IOP values onto non-volatile memory.

Displaying IOP Data

Procedure to read IOP values from non-volatile memory.

Pre-Repair Checks and Adjustments

Checks Prior to Parts Replacement

Procedures for determining faulty locations before replacing parts.

Forced Reset Procedure

Steps to reset the system microprocessor when the unit is unresponsive.

Retry Cause Display Mode

Using Retry Cause Display Mode

Procedure for entering and using the test mode to diagnose retry causes.

Reading Retry Cause Display Data

Explanation of how to interpret the displayed retry cause information.

Retry Cause Display Interpretation

Hexadecimal to Binary Conversion

Table for converting hexadecimal values to binary for display interpretation.

SECTION 2 GENERAL

Location of Controls Overview

Identifies and describes the location of all front and rear panel controls.

System Hookup and Control System

Hooking Up the System

Instructions for connecting the MD deck to other audio components.

CONTROL A1 Control System

Explanation of the CONTROL A1 system's functionality and compatibility.

CONTROL A1 System Functions and Clock Setting

Basic CONTROL A1 Functions

Details automatic function selection and synchronized recording features.

Setting the Internal Clock

Procedure for setting the internal clock for accurate date/time stamping.

SECTION 3 DISASSEMBLY

Chassis Section Disassembly

Step-by-step guide for disassembling the main chassis of the unit.

Front Panel Section Disassembly

Procedures for removing and accessing the front panel assembly.

Main Board Disassembly

Steps for removing the main circuit board from the unit.

Mechanism Section (MDM-5A) Disassembly

Instructions for removing the MD mechanism deck.

Slider (CAM) Disassembly

Steps for disassembling the slider or CAM mechanism.

Base Unit (MBU-5A), BD Board Disassembly

Procedures for removing the base unit and the BD circuit board.

SW Board and Loading Motor Disassembly

Steps for removing the SW board and loading motor assembly.

SECTION 4 TEST MODE

Test Mode Precautions

Important safety and operational guidelines before using the test mode.

Entering and Exiting Test Mode

Procedures for entering and exiting the unit's test modes.

Test Mode Basic Operations

Explanation of button functions used within the test modes.

Selecting Test Modes

Navigating Test Mode Groups

How to switch between test mode groups and select specific tests.

Overview of Service Test Modes

Lists available test modes for service, categorized by function.

Continuous Playback and Recording Modes

Operating Continuous Playback

Steps to enter, change, and exit the continuous playback test mode.

Operating Continuous Recording

Steps to enter, change, and exit the continuous recording test mode.

Non-Volatile Memory Mode (EEP MODE)

Description of the mode for reading/writing non-volatile memory contents.

Test Mode Displays and Button Functions

Test Mode Display Sequences

Describes the order of displays shown when using the DISPLAY/CHAR button.

Understanding Test Mode Displays

Explains various displays like mode, error rate, address, auto gain, etc.

Other Button Functions

Details the functions of buttons not directly related to test mode selection.

Meanings of Other Displays

Display Indicator Meanings

Explains the meaning of various indicators when they are lit or off.

SECTION 5 ELECTRICAL ADJUSTMENTS

Parts Replacement and Adjustment Flow

Outlines the procedure for checking and adjusting parts after replacement.

Adjustment Precautions and Disc Creation

Laser Diode and Optical Pick-Up Precautions

Safety warnings for checking laser emission and handling the optical pick-up.

General Adjustment Precautions

Important precautions to follow before and during component adjustments.

Creating a Continuously Recorded Disc

Procedure for preparing a disc needed for focus bias and error rate checks.

Pre-Repair Checks

Temperature Compensation Offset Check

Procedure to check temperature compensation offset accuracy.

Laser Power Check Procedure

Steps for checking the laser power output using a laser power meter.

Traverse Check Procedure

How to check the traverse mechanism's waveform and offset.

Playback and Error Rate Checks

Focus Bias Check Procedure

Method to check focus bias and determine focus tolerance.

C PLAY Checking Procedures

Performing MO and CD error rate checks using specific discs.

Self-Recording/Playback Check

Procedure to check error rates by recording and playing back a continuous disc.

Adjustment Procedures

Initial Setting of Adjustment Value

Resets adjustment values in non-volatile memory to initial settings.

IOP Information Recording and Display

Procedures for recording and reading IOP data for optical pick-up calibration.

Temperature Compensation Offset Adjustment

How to adjust the temperature compensation offset.

Traverse Adjustment Procedure

Read Power Traverse Adjustment

Adjusting the traverse mechanism for read power using an oscilloscope.

Write Power Traverse Adjustment

Adjusting traverse mechanism for write power using an oscilloscope.

Focus Bias and Traverse Adjustment

Focus Bias Adjustment Procedure

Steps to adjust focus bias by checking C1 error rate against specific values.

Error Rate and Gain Adjustments

Error Rate Checks (CD/MO)

Procedures for checking CD and MO error rates.

Focus Bias Check Procedure

Re-checking focus bias to ensure proper tolerance.

Auto Gain Control Level Adjustment

Adjusting CD and MO auto gain control output levels.

Adjusting and Connecting Points

BD Board Adjusting Points

Diagram showing adjusting points and connections on the BD board (Side A).

BD Board Connecting Points

Diagram showing connecting points on the BD board (Side B).

SECTION 6 DIAGRAMS

IC Pin Function Description

Detailed pin functions for IC101 on the BD board.

BD Board IC Pin Descriptions

IC121 CXD2654R Pinout

Detailed pin functions for IC121 on the BD board.

BD Board IC Pin Descriptions (Cont.)

IC121 CXD2654R Pinout (Cont.)

Continued detailed pin functions for IC121 on the BD board.

BD Board IC Pin Descriptions (Final)

IC121 CXD2654R Pinout (Final)

Final part of detailed pin functions for IC121 on the BD board.

Main Board IC Pin Descriptions

IC100 CXD8607N Pinout

Detailed pin functions for IC100 on the Main board.

Main Board IC Pin Descriptions (Cont.)

IC100 CXD8607N Pinout (Cont.)

Continued detailed pin functions for IC100 on the Main board.

Main Board IC Pin Descriptions (System Controller)

IC800 M30610MCA-264FP Pinout

Detailed pin functions for IC800 System Controller on the Main board.

Main Board IC Pin Descriptions (System Controller Cont.)

IC800 M30610MCA-264FP Pinout (Cont.)

Continued detailed pin functions for IC800 System Controller on the Main board.

Block Diagrams

Servo Section Block Diagram

Visual representation of the servo system's signal flow and components.

Main Section Block Diagrams

Main Section Block Diagram

Visual representation of the main section's signal flow and components.

Notes for Diagrams

Diagrammatic Notes and Abbreviations

Explains conventions used in schematic diagrams and printed wiring boards.

Printed Wiring Board Diagrams (BD Section)

BD Board (Side A) Layout

Component layout diagram for the BD board, Side A.

BD Board (Side B) Layout

Component layout diagram for the BD board, Side B.

Schematic Diagrams (BD Section)

BD Section Schematic (2/2)

Schematic diagram for the BD section, covering parts not in 1/2.

Waveform Diagrams

BD Board Waveforms

Illustrates key waveforms measured on the BD board during operation.

Main Board Waveforms

Illustrates key waveforms measured on the Main board during operation.

Schematic Diagrams (Main Section)

Main Section Schematic (1/3)

Part 1 of the schematic diagram for the Main board.

Schematic Diagrams (Main Section Cont.)

Main Section Schematic (2/3)

Part 2 of the schematic diagram for the Main board.

Printed Wiring Board Diagrams (Main Board Side A)

Main Board (Side A) Layout

Component layout diagram for the Main board, Side A.

Printed Wiring Board Diagrams (Main Board Side B, AC/BAT)

Main Board (Side B) Layout

Component layout diagram for the Main board, Side B.

AC/BAT Boards Layout

Component layout diagrams for the AC and BAT circuit boards.

Printed Wiring Board Diagrams (Panel Section)

Panel Section Board Layouts

Component layout diagrams for the Panel, PSW, HP, and VOL boards.

Schematic Diagrams (Panel Section)

Panel Section Schematic Diagram

Schematic diagram for the Panel section of the unit.

Schematic and Wiring Diagrams (BD Switch)

BD Switch Section Schematic

Schematic diagram for the BD Switch section.

BD Switch Section Printed Wiring Board

Component layout for the BD Switch section.

IC Block Diagrams

BD Board IC Block Diagrams

Block diagrams illustrating the internal functions of key ICs on the BD board.

Main Board IC Block Diagrams

IC100 CXD8607N Block Diagram

Internal block diagram for the IC100 A/D Converter chip.

IC101 CXA8054M Block Diagram

Internal block diagram for the IC101 chip.

IC203, 204 CXA8042AS Block Diagrams

Internal block diagrams for IC203 and IC204 chips.

Main Board IC Block Diagrams (Cont.)

IC200 CXD8767N Block Diagram

Internal block diagram for the IC200 chip.

Various IC Block Diagrams

IC300 SN74HC153ANS Block Diagram

Internal block diagram for the IC300 chip.

IC700 LA5632 Block Diagram

Internal block diagram for the IC700 chip.

IC400 LB1641 Block Diagram

Internal block diagram for the IC400 chip.

IC701 M5293L Block Diagram

Internal block diagram for the IC701 chip.

SECTION 7 EXPLODED VIEWS

Chassis Section Exploded View

Diagram showing the assembly of the unit's chassis and related parts.

Front Panel Section Exploded View

Front Panel Assembly Diagram

Exploded view detailing the front panel components and their assembly.

Mechanism Section Exploded View

Mechanism Section (MDM-5A) Assembly

Exploded view of the MD mechanism section (MDM-5A).

Base Unit Section Exploded View

Base Unit (MBU-5A) Assembly Diagram

Exploded view detailing the assembly of the base unit (MBU-5A).

Electrical Parts List Introduction

Parts List Notes and Abbreviations

Explains notes, abbreviations, and component identification marks used in the parts list.

BD Section Electrical Parts List

BD Board Components

List of components for the BD board, including diodes, ICs, connectors, coils, and transistors.

BD, DISP, HP Section Parts Lists

BD, DISP, HP Board Components

Lists components for BD, DISP, and HP boards, including resistors and switches.

HP and MAIN Section Parts Lists

HP and MAIN Board Components

Lists components for HP and MAIN boards, including resistors, connectors, ICs, and capacitors.

MAIN Section Parts List (Capacitors)

MAIN Board Capacitors

Detailed list of capacitors used on the MAIN board.

MAIN Section Parts List (ICs, Connectors, Transistors)

MAIN Board ICs, Connectors, Transistors

Lists ICs, connectors, and transistors found on the MAIN board.

MAIN Section Parts List (Resistors)

MAIN Board Resistors

Comprehensive list of resistors used on the MAIN board.

MAIN, PSW, SW Section Parts Lists

MAIN, PSW, SW Board Components

Lists components for MAIN, PSW, and SW boards, including resistors and switches.

SW, VOL Section Parts Lists

SW and VOL Board Components

Lists components for SW and VOL boards, including resistors, switches, and miscellaneous items.

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