Luma VCR425, Service Manual

Page: 16 / 74

Audio Block Diagram
REC
AMP
100 3
AUTO
BIAS
2
1
+5V
+5V
Q401
Q406
BIAS
OSC
Q402
Q404
(PB=ON)
Q405
(PB=ON)
Q403
SWITCHING
D-REC-OFF
5 EQ
AMP
9 8
7
LINE
AMP
REC-ON
AUDIO HD-SW
CONTROL
MUTE 11
6
PB-ON
SP/LP-ON
P
R
ALC
DET
ALC
IC301 (AUDIO SIGNAL PROCESS)
4 A-PB/REC
CL504
3 A-COM
1 AE-H
2 AE-H/FE-H
A-PB/REC 4
A-COM 3
AE-H 1
AE-H/FE-H 2
CL287
AUDIO
HEAD
AUDIO
ERASE
HEAD
ACE HEAD ASSEMBLY
FE HEAD
2 FE-H
1 FE-H-GND
CL501
1-7-5 1-7-6 HC341BLA
MAIN CBA
PB-AUDIO SIGNAL REC-AUDIO SIGNAL Mode : SP/REC
71
A-MUTE-H
I2C BUS-SCL
I2C BUS-SDA TO SERVO/SYSTEM
CONTROL BLOCK
FULL
ERASE
HEAD
68 69
SERIAL
DECODER
(DECK ASSEMBLY)
12
16
INV
ATT
TU701
SW
CTL
IC151 (SWITCHING)
PB/EE
PB/EE
PB/EE
PB/EE
TUNER
TU-AUDIO
IN2
IN1
IN1
AUDIO-SW-1
AUDIO-SW-2
TO SERVO/SYSTEM
CONTROL BLOCK
A-IN1
A-OUT1 8
6
JACK CBA
JK101
A-IN1(R)
A-IN1(L) 2
6
1
3 CL101
A-OUT1(R)
A-OUT1(L)
A-IN2
A-OUT2 8
6
8
6
8
6
JK102
A-IN2(R)
A-IN2(L) 2
6
1
3 CL102
CL151
CL152
A-OUT2(R)
A-OUT2(L)
21
1
5
2
4
12
14
15
11
10
9
3
13
TUNER
IN2
IN1
15
13
17
BUFFER
Q151
BUFFER
Q152