AEG VCR 4500, Service Manual

Page: 17 / 78

Audio Block Diagram ( B )
HG210BLA
1-7-4
REC AMP
100
3
AU
T
O
BIAS
2 1
+5V
TU701(TUNER UNIT)
+5V
Q401
Q406
(SWITCHING)
BIAS OSC
Q402
Q405 (PB=ON)
Q403
5
EQ AMP
9
8
7
LINE AMP
REC-ON
A
U
DIO HD-SW
CONTR
OL
MUTE
11
6
PB-ON
SP/LP-ON
P
TUNER IN2 IN1
R
ALC DET
SW
CTL ALC
IC301
(A
UDIO SIGNAL PR
OCESS)
IC151
(SWITCHING)
PB/EE PB/EE PB/EE PB/EE TUNER
TU-A
UDIO
A
UDIO
IN2 IN1 IN1
15 13 17
3
A-PB/REC
CN504
4
A-COM
6
AE-H
5
AE-H/FE-H
A-PB/REC
3
A-COM
4
AE-H
6
AE-H/FE-H
5
CN287
AU
D
IO
HEAD AU
D
IO
ERASE HEAD
A
C
E HEAD ASSEMBL
Y
FE HEAD
2
FE-H
1
FE-H-GND
CN501
MAIN CB
A
PB-AUDIO SIGNAL
REC-AUDIO SIGNAL
Mode : SP/REC
71
A-MUTE-H
A
U
DIO-SW
-1
A
U
DIO-SW
-2
IIC-B
US SCL
IIC-B
US SD
A
T
O
SER
V
O/SYSTEM
CONTR
OL BLOCK
T
O
SER
V
O/SYSTEM
CONTR
OL BLOCK
FULL ERASE HEAD
68
69
SERIAL
DECODER
(DECK ASSEMBLY)
12
16
INV
AT
T
A-IN1(L)
A-OUT1(R)
7 5
JACK CBA
JK101
CN101
A-IN2(L)
A-OUT2(R)
8 6
7 5 8 6
JK102
CN102
CN151 CN152
2
21
1 5 2 4
12 14 15 11 10
9
3
13
BUFFER
Q151
BUFFER
Q152
A-IN1 A-IN1
2 6 1 3
A-OUT1 A-OUT1 A-IN2 A-IN2
2 6 1 3
A-OUT2 A-OUT2
Comparison Char
t of
Models & Marks
Model
Mark
VCR 4500 VCR 4505
A B