Yamaha ax 497

Page 1

STEREO AMPLIFIER

AX-497

SERVICE MAN UAL

l IMPORTANT NOTICE

This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel,
II has been assumed iliat basic servree procedures iulierenr ro ihe indusny, and more specifically YAMAHA Products. are already
known and understood by the users and have therefore not been restated,

WARNING: Failure ro follow appropriate service and safety procedures when serwcmg this product ruay resuli in personal
injury desrrucrion of expensive components and failure of the product to perform as specified. For these reasons.
we advise all YAMAHA product owners tliai any service required should be performed by an authorized YAMAHA
Reiailer or ihe appointed service representative.

IMPORTANT: The presentation or sale of this manual to any indivrdual or firm does not constitute authorization ceriificalion or

recognition of any applicable technical capabilities or esrablisli a principleeagem relariouship of any form,
The data provided is believed to be accurare and applicable re the unitts) indicated on the cover. The research, engineering and service
deparlmenls of YAMAHA are continually striving Io improve YAMAHA products. Modificmmns are. iIlerefnre. inevilable and
specifications are subjecr io change without notice or obligalion io retrofit, Should any discrepancy appear to ex|SL please coniacr rhe
disliibulors Service Division.

WARNING: Staric discharges can desrroy expensive coruponents. Discharge any sraiic electricity your body may have
accumulated by grounding yourself io rhe ground buss in ilie uuit (heavy gauge black wires connect to this buss).
i IMPORTANT: Turn ilie unit OFF during disassembly and part replacemenl, Recheck all work before you apply power to the unit.

\ ,

I CONTENTS

TO SERVICE PERSONNEL ADJUSTMENT/DD ........................... 11
MPEDANCESELECTOR................ CDATA/ICDDD ............................ 12
REMOTECONTROLPANEL BLOCKDIAGRAM........................... 13
FRONT PANEL .. PIN CONNECTION DIAGRAM/DDDDDD ...... 14!

REAR PANELS . .
SPECIFICATIONS / D [l [I D
NTERNAL VIEW . . . .. . .

DISASSEMBLY PROCEDURES / [I D D D

PRINTED CIRCUIT BOARD ..
SCHEMATIC DIAGRAM
PARTS LIST . . . . .
REMOTE CONTROL RAX15 . .

15-20
21-22

COV- E7s7:;7M3. I J 7-7ifiimfiififléfifi LTLiL
This Service Manual uses recycied paper.

© 2005 YAMAHA CORPORATON. Ali righls reseved.

This manual IS copyrighted by YAMAHA and may not be copied or
redistributed either in punt or electronically Without permission. YAMAHA CORPORATION
POBox 1 Hamamaisu Japan

M 05.09

L6I7'XV

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AX-497

AX-497

I TO SERVICE PERSONNEL

. . . AC LEAKAGE
1. Critical Components Information WALL EQUIPMENT TESTER OFt
Components having special characteristics are marked A OUTLET UNDER TEST EQUIVALENT
and must be replaced with parts having specifications equal
to those originally installed. ® :37
2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify :
that all exposed conductive surfaces are properly insulated INSULATING
from supply circuits. TABLE
0 Meter impedance should be equivalent to 1500 ohms shunted 0 Leakage current "151 "0t exceed 0-5FHA-
.15 F.
by 0 I1 0 Be sure to test for leakage with the AC plug in both
polarities.
CAUTION
Es F151, F152 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A,125V FUSE."
CAUTION
F151, F152 : REPLACE WITH SAME TYPE 8A, 125V FUSE.
ATTENTION

F151, F152 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 8A,125V.

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.

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

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 solder or components located inside the enclosure of this product, wash your hands
before handling food.

About Lead Free Solder/D D l] D D I] D D I]

The P.C.Bs installed in this unit are soldered using the fol- D D I] D I] I] I] I] D D I] D I] D I] I] [I I] [I [I I] I] I] I] [I I]
lowingsolder. DDDDDUDDDDDD
SIDEA/Ai] SlDEB/BD
FUNCTION P.C.B. - Lead Free Solder/D I] [I D D
MAIN P.C.B. - Lead Free Solder/D I] [I D D

SMT REFLOW Process

Side B

Ml FLOW Process

Among some types of lead free solder currently available, it D D D D D D D D D D D D D D D D D D D D D [I I] I] I] I]

is recommended to use one of the following types for the U U E U D D D U U U E U D D D U U U E U D
repair work. U Sn-iAg-iCufl D +D +[l [I

~ Sn + Ag + Cu (tin + silver + copper) I] Sn-lCuD El +|:| I]

' Sn + Cu (tin + copper) I] Sn-l-Zn-lBi [I I] +|] D +D D D D D

0 Sn + Zn + Bi (tin + zinc + bismuth)