Yamaha YSP-4300 Service Manual page 124

A B
YSP-CU4300/YSP-CU3300/NS-WSW160
1
MAIN (1)
(Side A)
2
3
+
RE
DRIVER
SUBWOOFER WH
-
4
MAIN (3)
(Side A)
5
DSP (1)
(CB502)
6
RX
TX
MODE
3.3V
RST
+5V
DGND
STATUS_LED
DSP (1)
(CB503)
7
124
C D
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
of each capacitor indicated below to discharge electricity. The time required for discharging is about 30 seconds per each.
C23 and C24 on MAIN (1) P.C.B.
W2B
W2A
CB23
Group ID switch
(Reset) A – C 1 – 3
(For factory)
(Writing port)
CB206
CB205
LINK
indicator
W204
DGND
P-CON
SEL0
SEL1
GSEL1
GSEL2
DGND
PROT
AGND
SIG
E F G
NS-WSW160
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 C23、C24
5 k-ohms
10 W
+5V
P-CON
DGND
W5B3
W5B2
W5B1
5 k-ohms
10 W
• Semiconductor Location
Ref no. Location
D3 F3
D201 E5
D314 H4
IC303 G4
MAIN
AGND Q1 D4
+15
-15
Q2 D4
DGND
Q14 E3
PROT
Q15 D3
Q18A D2
Q18C E2
Q326 H3
H I
MAIN (2)
(Side A)
IC303
OUT COM IN
Sub-transformer
MAIN (4)
(Side A)
Power
transformer
RE
BL
RE
J
AC IN
CB301
CB302
IC3
WH
BE