Panasonic SA-AK78 Service Manual page 24

SA-AK78
RSN311W64A-P
POWER AMP
POWER CONTROL
26
(25)
23
(22)
19
(18)
24
POWER CONTROL/
PROTECTION CIRCUIT
13
16
RSN35H1
POWER AMP
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IC501
15
20
3
+B9
D601
6
CIRCUIT
1
(2)
5
(8)
11
(12)
9
14
Q501,502
GND
21 10 4 7
D602
-B2
-B3
N F
10
(14)
11
(13)
MUTING
9,12
IC502
POWER
BIAS
ON/OFF
7
R ch
D202
Q503
SWITCHING
(REMOTE)
+B8
D503
OVER
LOAD DET.
+B4
Q351~354
Q505,506
MOTOR
SIGNAL
DRIVE
LEVEL
DET.
M
FAN MOTOR
4
(1)
DETECTION
8
-B3
3
-B2
2
+B8
6
24
HEADPHONES
N
HIGH
RLY505
MID
SPEAKERS
(6 Ω)
LOW
RLY503
SURROUND
SPEAKERS
(8 Ω)
RLY504
Q504
RELAY
DRIVE
+B3~5
Q373~375
D371,373
POWER CONT.
/SWITCHING
CENTER
SPEAKER
(8Ω)
R ch