Yamaha as 801

Page 1

INTEGRATED AMPLIFIER

A-SBO1

SERVICE MANUAL

IMPORTANT NOTICE

This manual has been provided for the use ul'aulhorlvtd Yamaha Isetailers 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 scrvicmg this product may result in personal injury,
destruction ofcxpcnsivc components, and faIlurc of the product to pcrform as spCcIficd. For these reasons, we advise
all Yamaha product ovaiers that any service required should be performed by an authorized Yamaha Retailer or the
appointed service representative,

IMPORTANT: The presentation or sale ttf this manual In any Individual or firm does not Conslimle authorization, ceflificzilimi in
recognition oratiy applicable technical capabilities, or establish a principle-agenl relationship oratiy Torin.

The data provtded is believed to be accurate arid applicable to the untt(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 ccmpcrierits Discharge any static electricity your body may have
accumulated by grounding yourseltto the ground buss in the unit (heavy gauge black Wires connect to this buss).

IMPORTANT: Tiun the unit OFF during disassembly and part replacement. Recheck all work hetore you apply power to the unit.

I CONTENTS

TO SERVICE PERSONNEL ........................................... 2 POWER AMPLIFIER ADJUSTMENT]

IMPEDANCE SELECTOR 3 [iv-TyfiIlg ................................................ 29-30
FRONT PANEL 3 IC DATA ................................... 31-33
REAR PANELS - 5 PIN CONNECTION DIAGRAMs 34-35
REMOTE CONTROL PANEL -- 6 BLOCK DIAGRAM .................. 36
SPECIFICATIONS/afitifi 7 WIRING DIAGRAM ............... ...a7
INTERNAL VIEW ............... -- 8 PRINTED CIRCUIT BOARDS. 38-55
SERVICE PRECAUTIONS I v-exneaairegxa ...... a SCHEMA-nc DIAGRAMs ,,,,, 57-70
DISASSEMBLY PROCEDURES / fiflfllfi 9-11 REPLACEMENT PARTS LIST ............................... 71-81
UPDATING FIRMWARE/ REMOTE CONTROL .................................................... 82

77-A'717'0fl'ty 7?- I~ ........................... 12-14
SELF-DIAGNOSTIC FUNCTION /
9W 7' 7 (a EEQEEIAEE) .................................... 15-25

YAMAHA

Copyright tciYamaha Corporation All rights reserved
1 01 3 1 5 This manual I5 copyrighted by Yamaha and may not be copied or YAMAHA CORPORATION

redistributed either in print or electronically vvithotit permissroii

P.O.Box 1, Hamamatsu, Japan

(E) 15.01

LOBS'V

Page 2

A-SBO1

A-5801

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.

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

For U model
IEB CAUTION
_A_V F1:
125V FUSE."
For C model
CAUTION

AC LEAKAGE
WALL EQUIPMENT TESTER OR
OUTLET UNDER TEST EQUIVALENT

J:

INSULATING
TABLE

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

FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A,

F1: REPLACE WITH SAME TYPE 8A, 125V FUSE.

ATTENTION

F1: UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 8A, 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 fiflal \DfiIZ'DLT

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.

ZktéEIZtséliirhTL\é?K°T®§1li35$U/\yfiilnlfl:
geeseimfiax \y/JTv \ystlniyehfmim
flier \y 91:an ObUfiiifififig i) ifibi léflfisl:
liTEEUJot 5 fififia/ \y Stiwfilfi/Etfilfé Lia:

- Sn+Ag+Cu ($5 + E + 3'33)

I Sn+Cu ($5 +fi5D

- Sn+Zn+Bi ($5 + me + 5X71)
iii-i :
filter \y fiwfiifiifi elatiéfiwficm l) / \y Stilzttmi 30 ~
40°CTEE=§E < tensed)? %nzam>/ utilise
tr \yé'fcfalfififi < fiew