Harman Kardon AVR125 User Manual

harman/kardon
AVR125
A/V DOLBY DIGITAL RECEIVER
SERVICE MANUAL
CONTENTS
ESD WARNING………………………….…….2
LEAKAGE TESTING……………….....……....3
BASIC SPECIFICATIONS…………….….…..4
FRONT PANEL CONTROLS………………...5
FRONT PANEL DISPLAY…………………….7
REAR PANEL CONNECTIONS……..….……9
REMOTE CONTROL FUNCTIONS……..…..11
INSTALLATION AND CONNECTIONS….....14
TROUBLESHOOTING GUIDE…………..….16
MICROPROCESSOR RESET……….…..….16
UNIT EXPLODED VIEW………….…..……..17
DISASSEMBLY PROCEDURE..………….18
AMPLIFIER BIAS ADJUSTMENT……...…21
BLOCK DIAGRAM………………………….22
IC PINOUTS……………………………..….23
TRANSISTOR PINOUTS………..…..…….52
ELECTRICAL PARTS LIST………..…..….53
PCB DRAWINGS……………………..……62
SCHEMATICS…………………………...…70
WIRING DIAGRAM..……………………….82
PACKAGING………..…………………...…83
harman/kardon, Inc.
250 Crossways Park Dr.
Woodbury, New York 11797 Rev5 2/2005

Harman Kardon AVR125 Specifications

General

Type	AV Receiver
Channels	5.1
Total Harmonic Distortion	0.07 %
Frequency Response	20 Hz - 20 kHz
Input Sensitivity	200 mV
Weight	12.2 kg
Tuning range	FM/AM
Digital inputs	2 optical, 1 coaxial
Video inputs	3 composite, 1 S-Video

Summary

Safety Precautions

Electrostatic Discharge (ESD) Device Handling

Guidelines for handling sensitive electronic components to prevent static damage.

Leakage Current Check Procedure

Essential safety check to measure leakage current to earth ground before returning to customer.

Front Panel Interface

Front Panel Controls Identification

Rear Panel Connections

Rear Panel Connector Layout

Remote Control Operation

Remote Control Button Functions

Installation and Troubleshooting

System Installation and Connections

Step-by-step guide for connecting audio and video equipment to the AVR125.

Troubleshooting Common Issues

Guide to diagnosing and resolving common operational problems with the AVR125.

Processor Reset Procedure

Service Procedures and Diagrams

Exploded View and Parts List

Visual breakdown of unit components and a comprehensive list of replacement parts.

Disassembly Procedure

Amplifier Bias Adjustment

Procedure for adjusting the bias voltage and current in the amplifier section.

Block Diagrams and Schematics

Electrical Parts Lists

Front PCB Electrical Parts

Main PCB Electrical Parts

PCB Layouts, Schematics, and Wiring

PCB Layout Diagrams

Layout diagrams for various PCBs, showing component placement and routing.

Schematic Diagrams

Detailed circuit schematics for the AVR125's internal electronics.

Wiring Diagram