Yamaha ax 550

Page 1

I STEREO INTEGRATED AMPLIFIER .

AX-550

ERVICE M NU

c: p .2- grew 6

W55!
m M / 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 servree required should be performed by an authorized YAMAHA Retailer er 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 capabilitiet, or
establish a pnmlpxeagem relationship of my form.

The data provided ix believed to be accurate and applicable to the unit(s) indicated on the cover. The research,
a » ' engineering, and service departmenu of YAMAHA are conu'nually striving u) imprave YAMAHA products.
I 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 distributors Service Division.

OSSXV

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 wiru connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and pan replacement, Roche-ck all work before you

\ apply power to the unit. /

I CONTENTS

TO SERVICE PERSONNEL . .1 ADJUSTMENTS .....

REAR PANELS ...... 1~2 BLOCK DIAGRAM.

SPECIFICATIONS . .3 WIRING

DIMENSIONS ..... 3 PRINTED CIRCUIT BOARD .

INTERNAL VIEW 4 SCHEMATIC DIAGRAM . 1 2 ~1 3
DISASSEMBLY PROCEDURES ...................... . ................ 4 PARTS LIST.... ............ 1 4 ~ 2 1

REMOTE CONTROL TRANSMITTER .......

, YAMAHA

YAMAHA CORPORATION
HAMAMATSU, JAPAN
3.3K-522 [UGO Printed in Japan 91.3

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AX-550

AX-550

I TO SERVICE PERSONNEL

1. Critical Components Information.

Components having special characteristics are marked
and must be replaced with parts having specifications equal to
those originally installed.

2. Leakage Current Measurement (For 120 V Model Only).
When service has been completed. it is imperative that you
verify that all exposed conductive surfaces are properly
insulated from supply circuits.

- Meter impedance should be equivalent to 1500 ohm shunted

EQUIPMENT
A UN DER TEST

OR EQUIVALENT

WALLT l:l I C
OUTLE INSLILATING TABLE I

~ POLARIZATION

AC LEAKAGE TESTER

by 0.15 uF.
- Leakage current must not exceed 0.5 mA.
- Be sure to test for leakage with the AC plug in both polarities.

This product is equipped with a polarized alternating current
line plug (a plug having one blade wider than the other). This
plug will fit into the power outlet only one way. This is a safety

feature. we model only)

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or
plastic (where'applicable) components may also contain traces of chemicals found by the: California Health and
Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm. I

DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR
ANY REASON WHAT SO EVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or
expose eyes to solder/flux vapor!

If you come in contact with solderor components located inside the enclosure of this product, wash your hands
before handling food.

I REAR PANELS I
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