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Yamaha A-S501 Service Manual page 56

Integrated amplifier
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Table of Contents
A
B
A-S501/A-S301
1
MAIN (1)
(Side A)
2
3
4
5
A, B, G, L models
6
7
56
C
D
PREOUT_L
AGND
PREOUT_R
+7V
-7V
AGND
POWER
TRANSFORMER
E
F
A-S301
MAIN (5)
(Side A)
FUNCTION (1)
to HEATSINK R temperature
(W405)
VCC
GND
OUT
FUNCTION (1)
(W505)
PREMT
SWMT
MG
+5S
POW_MGT
THM
THM
#
#
SPBRY
SPARY
PRIY
PRI
PRD
Q124C
Q124A
5 k-ohms
10 W
5 k-ohms
10 W
Q123C
Q123A
#
#
Note: Those parts marked with "#" are not included in the P.C.B. ass'y.
(マーク#の部品は、P.C.B.に含まれません。)
MAIN (4)
(Side A)
Safety measures
OUT
• Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such
GND
as wearing insulating gloves.
VCC
• Note that the capacitors indicated below are dangerous even after the power is turned off because an electric charge remains and a
MAIN (2)
to HEATSINK
high voltage continues to exist there. Before starting any repair work, connect a discharging resistor (5 k‑ohms/10 W) to the terminals
(CB13)
L temperature
of each capacitor indicated below to discharge electricity. The time required for discharging is about 30 seconds per each.
C134, C135 on MAIN (1) P.C.B.
安全対策
・ この製品の内部には高電圧部分があり危険です。修理の際は、絶縁性の手袋を使用するなどの安全対策を行ってください。
・ 下記のコンデンサには電源を OFF にした後も電荷が残り、高電圧が維持されており危険です。修理作業前に放電用抵抗(5 k Ω /10 W)
を下記の各コンデンサの端子間に接続して放電してください。放電所用時間は各々約 30 秒間です。
MAIN(1)P.C.B. の C134、C135
G
H
I
B, G, J models
J
FUNCTION (2)
(W401)
FUNCTION (2)
(W402)
• Semiconductor Location
Ref no. Location
D111
D6
IC101
F6
IC102
G2
Q137
D5
Q129
D6
Q127
D6
Q139
F3
Q119
F4
Q138
G3
Q118
G3
Q120
G4
Q117
G5
Q115
H3
Q116
H4
Q113
H4
Q114
H4

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