Block Diagram -Rear/Power Section - Sony XM-444 Service Manual

XM-444
3-2. BLOCK DIAGRAM — REAR/POWER SECTION —
-3 -3
L (BTL)
CNJ801 (2/2)
INPUT
(REAR)
-4
-4
R
CNJ802 (2/2)
HI LEVEL L R
15V REG
B+
Q905,D905
(14.8V)
B- -15V REG
(-14.8V)
Q906,D906
B+
(23.5V)
B-
(-23.5V)
PRE AMP
LPF
IC804 (1/2) GAIN CONTROL
IC805 (1/2)
AMP
2 IC806 (1/2)
1 5 7
3 5
7
6
S802-1
LPF
(80Hz)
VR802-1
(REAR)
LEVEL
ON
(REAR)
OFF
PRE AMP
LPF
IC804 (2/2)
GAIN CONTROL
IC805 (2/2)
AMP
5
IC806 (2/2)
7 3 1
6 3
1
2
S802-2
LPF
(80Hz)
VR802-2
(REAR)
LEVEL
ON
(REAR)
OFF
DC-DC CONVERTER
RECT
TRANSFORMER
D903,904
T901 INVERTER
Q903
INVERTER
Q904
DIFFERENTIAL
SWITCH DRIVE AMP
AMP
Q301 Q304
Q302
BIAS
Q306,307
DIFFERENTIAL
DRIVE AMP
AMP
Q305
Q303
DIFFERENTIAL
SWITCH DRIVE AMP
AMP
Q401 Q404
Q402
C
BIAS
(Page 7)
Q406,407
MUTE
Q851
DIFFERENTIAL
DRIVE AMP
AMP
Q405
Q403
DC DET
4 2
IC851
12
DRIVER
9
Q907
1
ERROR 2
LED
DRIVER
10
3 DRIVE
Q908
Q803
15
ERROR
16
THERMAL
13 14
Q801
DC-DC CONVERTER
IC901
TH801
D804
D802
8 8
DRIVE AMP POWER AMP
Q308 Q310
OVERLOAD
DET
DRIVE AMP POWER AMP
Q312
Q309 Q311
(Page 7)
B
OFFSET
DET
Q852,853
DRIVE AMP POWER AMP
Q408 Q410
OVERLOAD
DRIVE AMP POWER AMP
DET
Q409 Q411
Q412
PROTECTOR
Q802
F901
B+
SWITCH
Q902
LD801
POWER/
PROTECTOR
POWER
ON/OFF
Q901
TH802 TH803
• Signal path
: AUDIO (REAR)
CN802 (2/2)
SPEAKER
OUT
(REAR)
L
BTL
R
A
(Page 7)
CN801
40A
+12V
REM
GND