Sony XM-222MK2 Service Manual page 2

SECTION 3
DIAGRAMS
3-1. BLOCK DIAGRAM
PRE AMP
IC801 (1/2)
-1
-1 6
7
L (BTL)
5
CNJ801
INPUT
PRE AMP
IC801 (2/2)
-2
3
-2
1
R
2
CNJ802
HI LEVEL
L R
15V REG
B+
Q951,952,
(14.6V)
D953
-15V REG
B-
Q953,954,
(-14.6V)
D954
DC-DC CONVERTER
RECT
D951,952
B+
(26.2V)
B-
(-26.2V)
LPF
GAIN CONTROL
IC802 (1/2)
AMP
IC803 (1/2)
5 7
5
SWITCH
7
Q101
6
S801-1
LPF
(80Hz)
VR801-1
ON
LEVEL
OFF
LPF
GAIN CONTROL
IC802 (2/2)
AMP
IC803 (2/2)
3 1
3
SWITCH
1
2 Q201
S801-2
LPF
(80Hz)
VR801-2
ON
LEVEL
OFF
MUTE
Q851
TRANSFORMER
T901 INVERTER
9
Q903
INVERTER
10
Q904
DIFFERENTIAL
DRIVE AMP DRIVE AMP
AMP
Q104 Q108
Q102
BIAS
Q106,107
DIFFERENTIAL
DRIVE AMP DRIVE AMP
AMP
Q105 Q109
Q103
DIFFERENTIAL
DRIVE AMP DRIVE AMP
AMP
Q204 Q208
Q202
BIAS
Q206,207
DIFFERENTIAL
DRIVE AMP DRIVE AMP
AMP
Q205 Q209
Q203
DC DET
4 2
IC851
12
1
LD801
POWER/
ERROR 2
PROTECTOR
LED
3
DRIVE
Q803
15
ERROR
16
THERMAL
13 14 Q801
DC-DC CONVERTER
IC901
TH801 TH802
D802
7 7
CN802
SPEAKER
OUT
POWER AMP
Q110
L
OVERLOAD
DET
POWER AMP
Q112
Q111
OFFSET
DET
Q852,853
POWER AMP
Q210
R
OVERLOAD
POWER AMP
DET
Q211
Q212
PROTECTOR
Q802
F901
CN801
20A
B+
SWITCH
+12V
Q902
POWER
ON/OFF
Q901
REM
GND
• Signal path
: AUDIO
XM-222MK2
BTL