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PLM-A55E
4-3.
BLOCK DIAGRAM – AUDIO/KEY CONTROL Section –
SA-52P BOARD
MENU/EXEC
8
DIAL 1
14
DIAL 2
15
POWER SW
10
POWER LED
13
TO
CHARGE LED
12
MAIN
BLOCK
ELECTRICAL
VOLUME
IC501
AU L
2
6
AU EVR
21
5
AU R
3
2
05
S702
MENU
SEL/PUSH EXEC
S701
ON/OFF
SURROUND AMP
IC503(1/3)
AMP
7
+
10
+
Q502
8
–
9
SURROUND SWITCH
13
+
14
2
12
–
DC BIAS
3
SURROUND AMP
IC503(1/3)
AMP
1
5
+
Q501
7
–
6
AMP
IC503(1/3)
3
+
1
–
2
– 43 –
D701
POWER
S703
(1/2)
PUSH DISPLAY
LED DRIVER
Q701
(2/2)
D702
CHARGE
IC502
1
4
HEADPHONE AMP
IC504
11
14
IN 2
MUTE SW
OUT 2
VREF
13
IN 1
OUT 1
5
6
8
SWITCH
Q512
• Signal path
: AUDIO
CN701
AU MUTE
MUTE SWITCH
16
Q503,508
HP L
24
2
HP RET
3
22
TO
4
MAIN
BLOCK
HP R
23
BB2
SWITCH
18
Q511
AVLS
20
SURROUND
17
– 44 –
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