Yamaha YSP-4300 Service Manual page 118

A B
YSP-CU4300/YSP-CU3300/NS-WSW160
1
POWER (1)
(Side A)
2
3
CB1
AC IN
4
5
U, C, V, S, J models
6
Notes)
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 the capacitors 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, connect a discharging resistor (5 k-ohms/10 W) to the terminals
7
of each capacitor indicated below to discharge electricity. The time required for discharging is about 30 seconds per each.
C8, C44 and C48 on POWER (1) P.C.B.
118
C D
T, K, A, B, G, F, L, H models
5 k-ohms
10 W
注意）
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
E F
YSP-CU4300 YSP-CU3300
U, C, V, S, J models
U, C, V, S, J models
T, K, A, B, G, F, L, H models
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。
POWER（1）P.C.B. の C8、C44、C48
G H I
AW_RPT
AW_PON
S6.3
SGND
DIGITAL
SGND
(CB106)
SGND
S3.3
S3.3
INPUT (3)
(CB72) INPUT (4)
(W63)
5 k-ohms
10 W
YSP-CU4300
CB4
CB7
W3
IC12 IC11
5 1 5 1
+26D
+26D
DAMP
DGND
(CB910)
DGND
+12D
J
DAMP
(CB913)
(YSP-CU4300)
DIGITAL
(W303)
P_CON
AC_PWR_DWN
26V_PRI
+3.3D
+3.3D
DGND
DGND
DGND
+12D
+12D
S3.3
DGND
DGND
+3.3D
DGND
+26D
INPUT (1)
(CB6)
• Semiconductor Location
Ref no. Location Ref no. Location
D1 C4 IC2 E4
D3 E4 IC3 D3
IC4 F3
D4 E4
D7 F4 IC6 F3
D8 F5 IC7 D3
D9 F4 IC11 H5
D14 E3 IC12 H5
D20 G4 Q2 E4