Service manual
ABCDEFGH
1
2
3
4
5
6
Soavo-900SW
18
■ PRINTED CIRCUIT BOARDS
MAIN (1) P.C.B. (Side A) MAIN (2) P.C.B. (Side A)
MAIN (3)
CB6
MAIN (5)
W3
POWER TRANSFORMER
MAIN (3)
CB21
MAIN (3) CB3
DIGITAL
CB101
DIGITAL
CB105
DIGITAL
CB106
MAIN (6)
W5B, W6B
DRIVER
WOOFER
POWER TRANSFORMER
(U, C, T, K, A, B, G, J models)
POWER TRANSFORMER
(R, L models)
LR
OUTPUT
INPUT 1
1
9
1
9
1
9
1
15
30
16
1
2
CH1
2
CH2
18
18
5 k-ohms
10W
L3
INPUT 2 (LFE)
L/R
INPUT 3
L/MONO /R
Circuit No.
CB11
CB19
R120
C62
R107
D31
Q17,18
R117
C65
C66
CB15
W8, 9
G1
C149, 150
J
X
O
X
X
X
X
X
O
X
O
O
X
O
O
X: NOT USED
O: USED/APPLICABLE
U, C
X
O
X
X
X
X
X
O
X
O
O
X
O
O
R, L
X
O
O
O
O
O
O
X
O
X
X
O
X
X
T, K
O
X
X
X
X
X
X
O
X
O
O
X
O
O
A
O
X
X
X
X
X
X
O
X
O
O
X
O
O
B,G
O
X
X
X
X
X
X
O
X
O
O
X
O
O
MAIN (1)
Point w
CH 1 : Out of IC11
CH 2 : Pin 11 of IC7
↑
AC POWER ON
(Connect the power cable)
↑
AC POWER OFF
(Disconnect the power cable)
↑
AC POWER ON
(Connect the power cable)
Point q (Pin 8 of IC7)
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。
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.