Philips VR550 - Audio Block Diagram

1-9-3
Audio Block Diagram
HG470BLA
REC AMP
100
3
AUTO BIAS
2 1
+5V
+5V
Q401
Q406
BIAS OSC
Q402
N-A-PB
TO Hi-Fi AUDIO BLOCK
N-A-REC
Q405 (PB=ON)
Q403
5
EQ AMP
98
7
LINE AMP
REC-ON
AUDIO HD-SW CONTROL
MUTE
11
6
PB-ON
SP/LP-ON
P
TUNER IN2
IN1
R
ALC
DET
ALC
IC301 (AUDIO SIGNAL PROCESS)
1513 17
3 A-PB/REC
CL504
4 A-COM 6 AE-H 5 AE-H/FE-H
AUDIO HEAD AUDIO ERASE HEAD
ACE HEAD ASSEMBLY
FE HEAD
2 FE-H 1 FE-H-GND
CL501
MAIN CBA
PB-AUDIO SIGNAL REC-AUDIO SIGNAL
Mode : SP/REC
71
A-MUTE-H
IIC-BUS SCL
IIC-BUS SDA
TO SERVO/SYSTEM CONTROL BLOCK
FULL ERASE HEAD
68 69
SERIAL
DECODER
(DECK ASSEMBLY)
" " = SMD
NOTE FOR WIRE CONNECTORS: 1. PREFIX SYMBOL "CN" MEANS CONNECTOR. (CAN DISCONNECT AND RECONNECT.) 2. PREFIX SYMBOL "CL" MEANS WIRE-SOLDER HOLES OF THE PCB. (WIRE IS SOLDERED DIRECTLY.)
TEST POINT INFORMATION
:INDICATES A TEST POINT WITH A JUMPER WIRE ACROSS A HOLE IN THE PCB. :USED TO INDICATE A TEST POINT WITH A COMPONENT LEAD ON FOIL SIDE. :USED TO INDICATE A TEST POINT WITH NO TEST PIN. :USED TO INDICATE A TEST POINT WITH A TEST PIN.
12
16
INV
AT T