Printed Circuit Boards - Yamaha Soavo-900SW Service Manual
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Also See for Soavo-900SW:
- Owner's manual (24 pages) ,
- Brochure & specs (20 pages) ,
- Owner's manual (164 pages)
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A
B
Soavo-900SW
PRINTED CIRCUIT BOARDS
1
Point q (Pin 8 of IC7)
2
Point w
CH 1 : Out of IC11
CH 2 : Pin 11 of IC7
3
↑
↑
AC POWER ON
AC POWER OFF
(Connect the power cable)
(Disconnect the power cable)
1
4
MAIN (3)
CB6
↑
AC POWER ON
(Connect the power cable)
MAIN (3)
CB21
5
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.
• C77 and C80 on the MAIN (1) P.C.B. are dangerous, for a high voltage is retained there even after the power is turned off.
Before the repair work, connect about 5k-ohm/10W resistor between terminals of the capacitor to forced discharging.
After the repair work, also perform forced discharging by connecting about 5k-ohm/10W resistor between terminals of the capacitor.
18
6
C
MAIN (1) P.C.B.
(Side A)
POWER TRANSFORMER
5 k-ohms
(U, C, T, K, A, B, G, J models)
10W
2
CH1
30
1
2
16
15
CH2
MAIN (3)
CB3
D
E
POWER TRANSFORMER
(R, L models)
DIGITAL
CB106
DIGITAL
CB105
DRIVER
WOOFER
1
9
1
1
DIGITAL
CB101
9
9
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。
・ MAIN (1) P.C.B. の C77 および C80 には電源 OFF 後も高電圧が維持されるため危険です。
修理前に 5k Ω /10W 程度の抵抗をコンデンサの端子間に接続して強制放電してください。
また、修理後も同様に 5k Ω /10W 程度の抵抗をコンデンサの端子間に接続して強制放電してください。
F
G
MAIN (2) P.C.B.
(Side A)
OUTPUT
INPUT 1
L
R
INPUT 2 (LFE)
L/R
INPUT 3
L/MONO /R
8
1
MAIN (1)
Circuit No.
J
U, C
R, L
CB11
X
X
X
CB19
O
O
O
R120
X
X
O
C62
X
X
O
R107
X
X
O
D31
X
X
O
Q17,18
X
X
O
R117
O
O
X
C65
X
X
O
C66
O
O
X
CB15
O
O
X
W8, 9
X
X
O
G1
O
O
X
C149, 150
O
O
X
X: NOT USED
O: USED/APPLICABLE
H
8
1
T, K
A
B,G
O
O
O
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
O
O
O
X
X
X
O
O
O
O
O
O
X
X
X
O
O
O
O
O
O
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