JVC KD-R420J User Manual

SERVICE MANUAL
COPYRIGHT © 2010 Victor Company of Japan, Limited
No.MA478<Rev.001>
2010/11
CD RECEIVER
MA478<Rev.001>201011SERVICE MANUAL
KD-R420J, KD-R421E, KD-R421EU, KD-R421EY,
KD-R422E, KD-R422EU, KD-R422EY, KD-R424UI,
KD-R425U, KD-R425UH, KD-R425UN, KD-R426U,
KD-R426UH, KD-R426UN, KD-R426UT,
KD-R427EE, KD-R428J, KD-R428UF, KD-R45E,
KD-R45EY, KD-R47EE, KD-R527EE
COPYRIGHT © 2010 Victor Company of Japan, Limited
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
KD-R420,KD-R424,
KD-R425,KD-R426,
KD-R428
ONLY
KD-R420,KD-R428
ONLY
KD-R421,KD-R422
KD-R427, KD-R45,
KD-R47, KD-R527
ONLY

JVC KD-R420J Specifications

General

Power Output	50W x 4
RMS Power	22W x 4
Tuner	AM/FM
Bluetooth	Yes
USB Port	Yes
Display Type	LCD
AUX Input	Yes
CD Player	Yes
Detachable Face	Yes
Subwoofer Output	Yes
Remote Control	Optional
High-Pass Filter	Yes
Low-Pass Filter	Yes
Channels	4
Audio Formats Supported	MP3, WMA
Equalizer	3-band
Dimensions (W x H x D)	178mm x 50mm x 160mm
Type	Single DIN

Summary

SECTION 1 PRECAUTION

Safety Precautions and General Handling

General safety guidelines for product handling, repair, and avoiding hazards like electric shock.

Product Warnings and Cautions

Covers critical parts, molding burrs, and essential safety checks for repairs.

ESD and Laser Product Safety Measures

Instructions to prevent ESD damage and essential safety warnings for laser product operation.

Traverse Unit Handling and Decomposition

Guidelines for safely handling, adjusting, and disassembling the traverse unit.

SECTION 3 DISASSEMBLY

Main Body Disassembly Procedures

Step-by-step instructions for removing the bottom chassis, front chassis, and main board.

CD Mechanism Disassembly Procedures

Detailed steps for removing the CD mechanism, switch board, and mecha control board.

SECTION 4 ADJUSTMENT

Adjustment Setup and Conditions

Lists test instruments, measuring conditions, volume settings, and dummy load usage.

Service Mode Operations

Guide to accessing and operating service modes for diagnostics and information display.

Information Clear and Error Modes

Procedures for clearing service data and accessing DC error information modes.

SECTION 5 TROUBLESHOOTING

16-Pin Cord Diagram and Model Compatibility

Wiring pin assignments for the 16-pin cord, detailing connections for various KD-R models.

SCHEMATIC DIAGRAMS

Schematic Diagram Precautions

Notes on potential discrepancies and references for schematic diagrams.

Parts List and Service Precautions

Guidelines for parts list usage, safety components, and service ground warnings.

Deviation Tolerance Range

Table defining acceptable deviation ranges for component values.

PARTS LIST

General Assembly and CD Mechanism Parts

Lists components for the general assembly and CD mechanism, including diagrams.

Board and Accessory Parts Lists

Details parts for switch boards, mecha control board, and packing materials by model.

Packing Materials and Accessories