Yamaha as 300

Page 1

INTEGRATED AMPLIFIER

A-SSOO/A-S3OO

SERVICE MANUAL

IMPORTANT NOTICE

Tlus manual has been provlded for rlre use oI'aIIIhm'lzed YAMAHA Relarlers and rherr servrce pcrsonnel,
II has been assurued rhal hasrc semce procedures mherem ro IIle Industry, and more speclfically YAMAHA Prodncls. are already known
and underslood by me users, and have Ilrerefore nor been resraled,

\VARN I

Fallure ro follow appropnale semee and safery procedures when seryrerng lhrs producl may resull rn personal Injury,
desrnrohon of expenslve cornponenfs. and fallure of Ihe producl lo perform as speorfied. For lhese reasons. we advlse
all YAMAHA producl owners Ihm any semoe reqmred should be performed by an anrhorrzed YAMAHA Relaller or
Ille appolmed senlce represemam e.

IIVIPORTANT: The presenlanon or sale of Ihls manual Io any Indlvldual or firm does not consllnue authorlzanon, cemficanon or

recognlllon ofally appllcable (echnlcnl Capabllmes, or eslabllsh a prlnclpIEragem reIaIImlsIIIp OI'nny form.
The dara provlded Is beheyed to be accurale and apphcable Io rhe IIrlII(s) Indlcaled on Ille cover, The research. ellglneenng. and semce
depanmems of YAMAHA are eonlrnually sIrIvIIlg lo Improve YAMAHA pl'oducls. Modlficatlons are. Iherefore, rnevnable and
speelficmlons are SubjecI lo change wnlloul name Or obllgauon m relrofil. Should any dlscrepancy appear Io exlsl. please comacl Ihe
dlstrlbulnr's Servlce DIVIsIon.

ARN N

: Slallc dIscIlarges can desrroy expenslve cornponenrs. Dlscharge any slallc eleclrrcuy your body may have
accumulared by groulldlng youl'selflo IIle ground buss m Ilre uml (heavy gauge black wlres oonnecr m IIlls buss).

IMPORTANT: TIIm Ihe unlt OFF dul'lllg drsassemhly and pan replacement. Recheck all work before you apply power to lhe unn.

I CONTENTS

TO SERVICE PERSONNEL 2
IMPEDANCE SELECTOR 3
FRONT PANELS 3
REAR PANELS .

SELF-DIAGNOSTIC FUNCTION /
@477 (Eaaemeaa) 21-27
AMP ADJUSTMENT] Tyjfiflafig
4-8 Ic DATA

REMOTE CONTROL PANEL
SPECIFICATIONS/5:11;; 9-10
INTERNAL VIEW
SERVICE PRECAUTIONS I v-Ezfiwiifigfi 11
DISASSEMBLY PROCEDURES/fifl¥IIIE . 12-15
UPDATING FIRMWARE/

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Thus Servlce Manual uses Iecycled papal.

101188

...9 PIN CONNECTION DIAGRAMS

Copyllgh1© 20m YAMAHA CORPORATION All nghls reserved.
Thls manual rs copyrlghted by YAMAHA and may not be copled or
redlslrlbuted ellhel m ohm or eleouomcally wllhoul permlssron,

BLOCK DIAGRAM 35
PRINTED CIRCUIT BOARDS 36-52
SCHEMATIC DIAGRAMS
REPLACEMENT PARTS LIST .
REMOTE CONTROL

fiYAMAHA

YAMAHA CORPORATION

P.O.Box 1, Hamamatsu. Japan
'10.09

Page 2

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A-SSOO/A-S300

I TO SERVICE PERSONNEL

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

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
from supply circuits.

0 Meter impedance should be equivalent to 1500 ohms shunted
by 0.15 uF.

For U model
IE9 CAUTION

AC LEAKAGE
WALL EQUIPMENT TESTER OR
OUTLET UNDER TEST EQUIVALENT

@ID-

J:

INSULATING
TABLE

- Leakage current must not exceed 0.5mA.
0 Be sure to test for leakage with the AC plug in both polariA
ties.

LALV F1: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A (A8500)

/6A (A6300), 125V FUSE."

For C model
CAUTION

F1: REPLACE WITH SAME TYPE 8A (AS500) / 6A (A8300), 125V FUSE.

ATTENTION

F1: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 8A (AASSOO) / 6A (AS300), 125V.

WARNING: CHEMICAL CONTENT NOTICE!

This product contains chemicals known to the State of California to cause cancer, 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 l fifial \yfiIZ'DLVC

All of the P.C.B.s installed in this unit and solder joints are
soldered using the lead free solder.
Among some types of lead free solder currently available,
it is recommended to use one of the following types for
the repair work.

0 Sn + Ag + Cu (tin + silver + copper)

0 Sn + Cu (tin + copper)

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

Caution:
As the melting point temperature of the lead free solder
is about 30°C to 40°C (50°F to 70°F) higher than that of
the lead solder, be sure to use a soldering iron suitable
to each solder.

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