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SERVICE MANUAL
MICROFILM
9-922-860-11
• DHC-EX770MD is composed of following models.
As for the service manual, it is issued for each component
model, then, please refer to it.
COMPONENTS MODEL NAME FOR DHC-EX770MD
AMPLIFIER
TUNER
CD PLAYER
MINIDISC DECK
HCD-EX770 is composed of TA-EX770 and CDP-EX770
PARTS LIST (ACCESSORIES & PACKING MATERIALS)
Part No.
Description
1-475-883-11 COMMANDER, STANDARD (RM-EX77)
1-501-594-11 ANTENNA (FM)
1-501-721-11 ANTENNA (LOOP)
1-769-170-21 CORD (WITH CONNECTOR) (7P) (TA-ST-MDS-CDP)
1-775-373-11 CORD, CONNECTION (0.5m) (AUDIO)
1-775-924-11 CORD, LIGHT PLUG
3-860-163-13 MANUAL, INSTRUCTION (ENGLISH, SPANISH)
3-860-163-23 MANUAL, INSTRUCTION (FRENCH, DUTCH) (AEP)
3-860-163-33 MANUAL, INSTRUCTION (GERMAN, ITALIAN) (AEP)
3-860-143-43 MANUAL, INSTRUCTION (SWEDISH, PORTUGUESE) (AEP)
4-981-643-01 COVER, BATTERY (FOR RM-EX77)
4-992-237-01 CAP (PJ) (FOR TA-EX770)
Sony Corporation
Home A&V Products Company
DHC-EX770MD
TA-EX770
ST-EX770
CDP-EX770
MDS-EX770
MINI Hi-Fi COMPONENT SYSTEM
HCD-EX770
AEP Model
UK Model
98D001648-1D
Printed in Japan ©1998.4
Published by Quality Assurance Dept.
(Shibaura)
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Table of Contents
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Summarization of Contents
Service Manual
Components Model Name for DHC-EX770MD
Lists the model names of the components that make up the DHC-EX770MD system.
Parts List (Accessories & Packing Materials)
Lists accessories and packing materials included with the system.
Model Identification
Identifies the model based on the back panel labels and region.
SAFETY-RELATED COMPONENT WARNING!!
Highlights components critical for safe operation, requiring specific replacement parts.
Specifications
General
General specifications and abbreviations for the TA-EX66/EX77 model.
Abbreviation
List of abbreviations used in the specifications section.
SECTION 1 GENERAL
Listening to the Radio
Instructions for tuning into radio stations using the preset tuning method.
Labeling the Preset Stations
Procedure for naming and storing favorite radio stations.
Using the Radio Data System (RDS)
Guide on how to utilize RDS features for radio program information.
SECTION 2 DISASSEMBLY
CASE, FRONT PANEL ASS’Y
Step-by-step instructions for disassembling the front panel case.
BACK PANEL
Procedure for removing the back panel of the unit.
CONNECTOR BOARD
Steps to detach the connector board from the unit.
MAIN BOARD
Instructions for removing the main board from the unit.
SECTION 3 DIAGRAMS
3-1. IC PIN FUNCTION DESCRIPTION
Details of pin functions for various ICs used in the system.
IC Block Diagrams
Visual representations of the internal circuitry of key ICs.
Waveforms
Illustrates output waveforms for specific IC pins, aiding in troubleshooting.
Circuit Boards Location
Diagram showing the physical placement of circuit boards within the unit.
SECTION 4 EXPLODED VIEWS
(1) CASE, FRONT PANEL SECTION
Exploded view of the front panel assembly and its components.
(2) MAIN SECTION
Exploded view detailing the main internal components and their layout.
SECTION 5 ELECTRICAL PARTS LIST
BD
List of electrical components for the BD board.
MAIN
List of electrical components for the main board.
PANEL
List of electrical components for the panel board.
MISCELLANEOUS
List of miscellaneous parts.
HARDWARE LIST
List of hardware components like screws.
SECTION 1 SERVICING NOTES
How to operate with a single unit.
Instructions for operating the unit standalone, requiring external equipment.
KEY/FL tube/LED check mode.
Diagnostic mode for checking indicator lights and buttons functionality.
SECTION 2 GENERAL
Playing the MD tracks in random order
Instructions for playing MD tracks in a shuffled sequence.
Checking the remaining time of a track
How to check the remaining time for the current track and total tracks.
Using the MD display
Information on interpreting the MD unit display during operation.
SECTION 3 DISASSEMBLY
CASE, CHASSIS
Step-by-step instructions for disassembling the main chassis.
LOADING PANEL
Procedure for removing the loading panel assembly.
FRONT PANEL SECTION
Instructions for disassembling the front panel section.
MECHANISM DECK
Steps for removing the CD mechanism deck.
SECTION 4 ELECTRICAL ADJUSTMENTS
Precautions in Repairing
Important warnings and considerations before attempting repairs.
AM SECTION
Adjustment procedures for the AM tuning level.
FM SECTION
Adjustment procedures for the FM tuning level.
Focus Bias Adjustment
Procedure for adjusting the focus bias of the optical pick-up.
RF Level Check
Procedure to check the RF signal level for proper operation.
E-F Balance (Traverse) Check
Procedure to check and adjust the E-F balance for traverse.
S-Curve Check
Steps to perform an S-curve check for optical pick-up alignment.
SECTION 5 DIAGRAMS
Circuit Boards Location
Diagram showing the physical placement of circuit boards within the unit.
Waveforms
Illustrates output waveforms for specific IC pins, aiding in troubleshooting.
IC Block Diagrams
Visual representations of the internal circuitry of key ICs.
SECTION 7 EXPLODED VIEWS
(1) CHASSIS SECTION
Exploded view of the chassis assembly and its components.
(2) MECHANISM DECK SECTION-1 (MDM-3A)
Exploded view of the MD mechanism deck section 1.
(3) MECHANISM DECK SECTION-2 (MDM-3A)
Exploded view of the MD mechanism deck section 2.
SECTION 8 ELECTRICAL PARTS LIST
BD
List of electrical components for the BD board.
MAIN
List of electrical components for the main board.
PANEL
List of electrical components for the panel board.
MISCELLANEOUS
List of miscellaneous parts.
HARDWARE LIST
List of hardware components like screws.
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