Yamaha-AS-501-Service-Manual.pdf

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A-S501/A-S301
SERVICE MANUAL
INTEGRATED AMPLIFIER
A-S501/A-S301
■
CONTENTS
TO SERVICE PERSONNEL ........................................... 2
IMPEDANCE SELECTOR .............................................. 3
FRONT PANELS ............................................................ 3
REAR PANELS .......................................................... 4–8
REMOTE CONTROL PANEL ......................................... 9
SPECIFICATIONS /
参考仕様
.................................. 9–10
INTERNAL VIEW ..........................................................11
SERVICE PRECAUTIONS /
サービス時の注意事項
.....11
DISASSEMBLY PROCEDURES /
分解手順
.......... 12–14
UPDATING FIRMWARE /
ファームウェアのアップデート
........................... 15–17
SELF-DIAGNOSTIC FUNCTION /
ダイアグ（自己診断機�½）
.................................... 18–30
POWER AMPLIFIER ADJUSTMENT /
パワーアンプ調整
................................................ 31–32
IC DATA .................................................................. 33–35
PIN CONNECTION DIAGRAMS .................................. 36
BLOCK DIAGRAM ....................................................... 37
WIRING DIAGRAM ...................................................... 38
PRINTED CIRCUIT BOARDS ................................ 39–60
SCHEMATIC DIAGRAMS ...................................... 61–69
REPLACEMENT PARTS LIST ............................... 71–89
REMOTE CONTROL.................................................... 90
1013 13
IP
'14.12
A-S501/A-S301
■
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 120V Models Only)
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
INSULATING
TABLE
WALL
OUTLET
EQUIPMENT
UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
A-S501/A-S301
• Meter impedance should be equivalent to 1500 ohms shunted
by 0.15 μF.
• Leakage current must not exceed 0.5mA.
• Be sure to test for leakage with the AC plug in both polarities.
For U model
“CAUTION”
“F1:
FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A
(A‑S501) / 6A (A‑S301), 125V FUSE.”
For C model
CAUTION
F1:
REPLACE WITH SAME TYPE 8A (A‑S501) / 6A (A‑S301), 125V FUSE.
ATTENTION
F1:
UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 8A (A‑S501) / 6A (A‑S301), 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 /
無鉛ハンダについて
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.
• Sn
+
Ag
+ Cu (tin + silver + copper)
• Sn
+ Cu (tin + copper)
• Sn
+ Zn +
Bi
(tin + zinc + bismuth)
本機に搭載されているすべての基板およびハンダ付けに
よる接合部は無鉛ハンダでハンダ付けされています。
無鉛ハンダにはいくつかの種類がありますが、修理時に
は下記のような無鉛ハンダの�½�用を推奨します。
• Sn+Ag+Cu（錫
+
銀
+
銅）
• Sn+Cu（錫
+
銅）
• Sn+Zn+Bi（錫
+
亜鉛
+
ビスマス）
Caution:
As
the melting point temperature of the lead free solder is
about
30°
to 40° (50° to 70° higher than that of
C
C
F
F)
the lead solder, be sure to use a soldering iron suitable to
each solder.
注意：
無鉛ハンダの融点温度は通常の鉛入りハンダに比べ
30
∼
40℃程度高くなっていますので、
それぞれのハンダに合っ
たハンダごてをご�½�用ください。
2
A-S501/A-S301
■
IMPEDANCE SELECTOR
WARNING:
Do not change the setting of the IMPEDANCE SELECTOR
switch when the unit power is switched on, as doing so may
damage the unit.
A-S501/A-S301
IMPEDANCE SELECTOR
■
FRONT PANELS
A-S501
A-S501
A-S301
A-S301
3
A-S501/A-S301
■
REAR PANELS
A-S501 (U model)
A-S501
A-S501/A-S301
A-S501 (R model)
A-S501 (T model))
4
A-S501/A-S301
A-S501 (A model)
A-S501/A-S301
A-S501 (B, G models)
A-S501 (L model)
5

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