Yamaha YSP-1100U Service Manual page 52

A B
YSP-1100
1
INPUT (1) P.C.B. (Side A)
2
1 3
INPUT (2)
(W505)
3
AGND
AGND
+12A
+5VA
S3.3
+12B
GND
GND
1
3
4
3
1
DSP
(W1)
AGND
AGND
+12A
+12V
+12V
+5VA(ADC DAC)
GND
5 GND
-24V
S3.3
S3.3BK
RESET
PW_DOWN
POW_RY
TEMP
6
Safety measures
• Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing,
such as wearing insulating gloves.
7
• Note that C523 is dangerous even after the power is turned off because an electric charge remains and a high voltage continues
to exist there.
Before starting any repair work, perform discharge by connecting a discharge resistor (5 k-ohms/10 W) between C523 terminals.
52
C D
1
3
1
AMP (2)
(W501)
AMP (1)
(W701)
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。
・ C523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 kΩ/10 W） をC523の端子間に接続して放電してください。
E F
14
8
7 1
3
5 k-ohms
10 W
G H I
Circuit No.
C501
X : NOT USED
O : USED / APPLICABLE
• Semiconductor Location
Ref. No. Location Ref. No. Location Ref. No. Location Ref. No. Location Ref. No. Location
D501 C3 D518 F5 D542
D503 F3 D522 D4 IC501
D510 G5 D523 D5 IC502
D515 F5 D524 D4 IC503
D516 F4 D528 C4 IC504
D517 F4 D531 F6 IC506
J
U, C, V, J T, K, A, B, G, E, L
X O
AC IN
C5 IC507 E5 Q502 C3
D3 IC509 B4 Q503 D2
E3 IC510 B4 Q505 G4
D2 IC511 C3 Q506 C4
F6 IC512 F5
B3 Q501 F3