Yamaha AX-496 - Service Manual

AX-496/396
SERVICE MANUAL
STEREO AMPLIFIER
AX-496/396
100702
■ CONTENTS
SPECIFICATIONS.......................................................... 1
TO SERVICE PERSONNEL .......................................... 2
REMOTE CONTROL PANEL ........................................ 2
IMPEDANCE SELECTOR ............................................. 2
FRONT PANELS ............................................................ 3
REAR PANELS .............................................................. 3
INTERNAL VIEW ........................................................... 6
DISASSEMBLY PROCEDURES ................................... 6
ADJUSTMENTS ............................................................. 7
BLOCK DIAGRAM ......................................................... 8
µ-COM DATA ................................................................. 9
PRINTED CIRCUIT BOARD .................................. 10~25
SCHEMATIC DIAGRAM ........................................ 26~29
PARTS LIST ........................................................... 30~47
REMOTE CONTROL TRANSMITTER ........................ 48
IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products,
are already known and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result
in personal injury, destruction of expensive components, and failure of the product to perform as
specified. For these reasons, we advise all YAMAHA product owners that any service required
should be performed by an authorized YAMAHA Retailer or the appointed service representative.
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute authorization,
certification or recognition of any applicable technical capabilities, or establish a principle-agent
relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research,
engineering, and service departments of YAMAHA are continually striving to improve YAMAHA products.
Modifications are, therefore, inevitable and specifications are subject to change without notice or obligation to
retrofit. Should any discrepancy appear to exist, please contact the distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body
may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black
wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply
power to the unit.
AX-496/396
P.O.Box 1, Hamamatsu, Japan

Summary

Specifications

Power Section

Detailed output power and bandwidth specifications.

General Specifications

Power supply, consumption, dimensions, weight, and color options.

To Service Personnel

Critical Components Information

Guidelines for replacing critical components with exact specifications.

Leakage Current Measurement

Procedures for verifying insulation and safety after servicing.

Disassembly Procedures

Removal of Top Cover

Instructions for removing the top panel of the unit.

Removal of Front Panel

Instructions for removing the front panel assembly.

MAIN P.C.B. (1) Checking and Parts Replacement

Steps for accessing and replacing parts on the main PCB.

Adjustments

Confirmation of Idling Current

Procedure to measure and confirm the idling current.

Block Diagram

µ-COM Data

Printed Circuit Board Layouts

Schematic Diagram

Pin Connection Diagrams for Components

Pin connection diagrams for transistors, diodes, and ICs used in AX-396.

Parts List

Electrical Parts

List of electrical components with part numbers and descriptions.

AX-496 Parts List

AX-496 Component Listing

Final listing of AX-496 components, including switches and potentiometers.

AX-396 Parts List

AX-396 Component Listing

Exploded View (AX-496)

AX-496 Mechanical Parts

Exploded View (AX-396)

AX-396 Mechanical Parts

Yamaha AX-496 Specifications

General

Signal-to-Noise Ratio	110 dB (CD)
Type	Integrated Amplifier
Total Harmonic Distortion	0.015%
Input Sensitivity/Impedance	47kOhm
Dimensions	435 x 151 mm
Speaker Load Impedance	4 Ohms
Power Output	85W + 85W (8 ohms, 20Hz-20kHz, 0.015% THD)