Yamaha RX-V381 Service Manual page 84

A B
RX-V381/HTR-3069
1
MAIN (1)
(Side A)
AUDIO1
2
OPTICAL
(TV)
MAIN (3)
(CB42)
3
+3.3D
AUD1_D
DGND
AUD2_D
DGND
AV1_D
DGND
AGND
ADR
2AGND
ADL
-12A
AUXR
AUXE
4
AUXL
+12A
MIC
AGND
DA_FL
AGND
DA_FR
AGND
DA_C
AGND
DA_SW
AGND
DA_SL
AGND
DA_SR
MAIN (2)
(CB46)
5
6
7
84
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.
C79, C80 on MAIN (1) P.C.B.
AUDIO2 AV1 AV2 AV3
COAXIAL COAXIAL
(CD) L/R L/R
E F
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 C79、C80
SUBWOOFER
PRE OUT
CB2
W1
OPERATION (4)
(CB522)
G H
SPEAKERS
FRONT
R L
+/- +/-
SURROUND CENTER
R L
+/- +/-
TUE
5CH_MT
VOL_MOSI
DGND
I_PRT
AMP_LMT
HP_N_DET
SPRY_5CH
THM2_PRT
OPERATION (7)
(CB477)
I J
• Semiconductor Location
Ref no. Location
D47 H5
D48 I3
Q13 D5
Q14 D5
Q15 D5
Q17 C5
ACL
Q18 B5
ACL
Q19 F6
E
Q20 E6
E
Q23 D6
ACH
Q24 C6
ACH
Q25 G5
Q26 F5
POWER
Q27 H6
TRANSFORMER
Q29 D6
Q31 G6
Q32 F6
Q33 F6
Q34 E6
5 k-ohms
10 W Q35 H6
Q36 G6
Q39 D6
5 k-ohms
Q40 C6
10 W
Q41 C6
Q42 B6
Q43 G6
Q44 F6
Q45 F6
TUL
Q46 E6
TUR
SW_MT
Q47 G6
VOL_SCK
Q48 G6
DC_PRT
AMP_OLV
Q51 D6
TRANS_RY
HPRY
Q52 C6
PS_PRT
Q53 C6
Q54 B6
Q62 E4
Q63 F5
DIGITAL
(CB222) Q64 E4
Q65 E4
Q66 F5
Q67 F4
Q68 F4
Q77 I3
Q80 E3
Q81 E4