Panasonic SA-AK78 Service Manual page 24

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