Sony PLM-A55E, Service Manual

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