Yamaha HTY-7040 Service Manual page 74

A B
YSP-4000/YSP-40D/HTY-7040
1
POWER (1) P.C.B.
(Side A)
2
S6.3
SGND
SGND
HDMI
(CB5) SGND
S4.3
S4.3
3
GND
A+5
DSP
(CB7) AGND
D+12
+3.3V
4
+5I
D+12
IGND
XGND
iPOD_POWER
+12A
+12B
AGND
AGND
DGND
-30V
S3.3
POW_RY
5
RESET
PW_DOWN
INPUT
(CB11)
6
7
74
C D
OUT
COM
IN
IN
IN
COM
COM
OUT
OUT
IC520
5 1
CB504 CB505
U, C, A, B models
AMP AMP
(W501) (W502)
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.
• Note that positions indicated below are 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 (5k-ohms/
10W) between terminals at following positions. The time required for discharging is about 30 seconds.
1. C504/C505 on POWER (1) P.C.B.
2. C518 on POWER (1) P.C.B.
E F G
• Semiconductor Location
Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location Ref no. Location
D501 G4
D505 H5
D509 G5
D514 F5
D516 F5
K, A, B, G, E, L models U, C, V, J models
IC506
IC503
7 1
5 4
IC505
IC501
5 k-ohms
10 W
H I
D518 E4 D530 F5 D536 C3 IC501 F6 IC509
D519 D4 D531 E3 D537 C3 IC502 G3 IC510
D520 D4 D532 E3 D538 F3 IC503 F3 IC511
D522 D5 D534 F5 D539 F3 IC505 F6 IC520
D529 F4 D535 F4 D540 E3 IC506 F3 Q502
K, A, B, G, E, L models
CB503 CB502
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。
・ 下記箇所には電源を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）
を下記箇所の端子間に接続して放電してください。放電所用時間は約30秒間です。
1. POWER （1） P.C.B.のC504／C505
2. POWER （1） P.C.B.のC518
J
C4 Q503 E2
D4 Q504 G5
C3 Q506 D4
C5
D2
AC IN