Sony XM-444W Service Manual ▷ View online
5
XM-444W
SECTION 2
DISASSEMBLY
2-1.
BOTTOM PLATE
(Page 5)
(Page 5)
2-2.
HEAT SINK
(Page 6)
(Page 6)
SET
2-3.
AMP BOARD
(Page 6)
(Page 6)
Note : This set can be disassemble according to the following sequence.
Note : Follow the disassembly procedure in the numerical order given.
2-1. BOTTOM PLATE
1
BTP 3x6
2
BTP 3x6
3
bottom plate
6
XM-444W
2-2. HEAT SINK
2-3. AMP BOARD
1
BVTP 3x8
4
AMP board
5
heat sink
2
BVTP 3x8
3
BVTP 3x8
1
BVTP 3x8
2
rear panel
3
BVTP 3x8
4
front panel
5
AMP board
7
7
XM-444W
3-1. BLOCK DIAGRAM — FRONT SECTION —
SECTION 3
DIAGRAMS
DIFFERENTIAL
AMP
Q102
DRIVE AMP
Q104
S801-1
HPF
(80Hz)
DRIVE AMP
Q108
DIFFERENTIAL
AMP
Q103
DRIVE AMP
Q105
DRIVE AMP
Q109
POWER AMP
Q110
POWER AMP
Q111
BIAS
Q106,107
7
DIFFERENTIAL
AMP
Q202
DRIVE AMP
Q204
SWITCH
Q201
DRIVE AMP
Q208
DIFFERENTIAL
AMP
Q203
DRIVE AMP
Q205
DRIVE AMP
Q209
POWER AMP
Q210
POWER AMP
Q211
OVERLOAD
DET
Q212
1
6
1
3
CN802 (1/2)
SPEAKER
OUT
BIAS
Q206,207
3
2
2
5
6
(FRONT)
ON
OFF
(FRONT)
ON
OFF
S801-2
HPF
(80Hz)
PRE AMP
IC801 (1/2)
PRE AMP
IC801 (2/2)
HPF
IC802 (1/2)
GAIN CONTROL
AMP
IC803 (1/2)
GAIN CONTROL
AMP
IC803 (2/2)
-1
-2
-2
R
CNJ802 (1/2)
VR801-2
LEVEL
(FRONT)
HI LEVEL
INPUT
(FRONT)
CNJ801 (1/2)
L
L
R
R
BTL
-1
L (BTL)
OVERLOAD
DET
Q112
B
A
C
5
7
HPF
IC802 (2/2)
5
VR801-1
LEVEL
(FRONT)
3
1
7
SWITCH
Q101
(FRONT)
• Signal path
: AUDIO (FRONT)
(Page 8)
(Page 8)
(Page 8)
8
8
XM-444W
3-2. BLOCK DIAGRAM — REAR/POWER SECTION —
DIFFERENTIAL
AMP
Q302
DRIVE AMP
Q304
S802-1
LPF
(80Hz)
DRIVE AMP
Q308
DIFFERENTIAL
AMP
Q303
DRIVE AMP
Q305
DRIVE AMP
Q309
POWER AMP
Q310
POWER AMP
Q311
BIAS
Q306,307
7
DIFFERENTIAL
AMP
Q402
DRIVE AMP
Q404
SWITCH
Q401
MUTE
Q851
DRIVE AMP
Q408
DIFFERENTIAL
AMP
Q403
DRIVE AMP
Q405
DC DET
IC851
DRIVE AMP
Q409
POWER AMP
Q410
POWER AMP
Q411
OVERLOAD
DET
Q412
PROTECTOR
Q802
POWER/
PROTECTOR
LD801
1
4
2
12
1
3
16
13
14
B+
SWITCH
Q902
POWER
ON/OFF
Q901
INVERTER
Q903
INVERTER
Q904
15V REG
Q905,D905
6
1
3
CN802 (2/2)
SPEAKER
OUT
(REAR)
CN801
BIAS
Q406,407
9
DRIVER
Q907
DRIVER
Q908
10
LED
DRIVE
Q803
TH801
D804
TH802
D802
TH803
3
2
2
5
6
(REAR)
ON
OFF
S802-2
LPF
(80Hz)
(REAR)
ON
OFF
PRE AMP
IC804 (1/2)
PRE AMP
IC804 (2/2)
LPF
IC805 (1/2)
GAIN CONTROL
AMP
IC806 (1/2)
GAIN CONTROL
AMP
IC806 (2/2)
CNJ802 (2/2)
VR802-2
LEVEL
(REAR)
LPF
IC805 (2/2)
B+
(14.8V)
B-
(-14.8V)
B+
(23.5V)
B-
(-23.5V)
DC-DC CONVERTER
TRANSFORMER
T901
RECT
D903,904
15
ERROR
ERROR
DC-DC CONVERTER
IC901
THERMAL
Q801
F901
40A
+12V
HI LEVEL
INPUT
(REAR)
CNJ801 (2/2)
REM
GND
L
L
R
R
BTL
-4
R
-4
-3
L (BTL)
-3
OFFSET
DET
Q852,853
OVERLOAD
DET
Q312
7
B
A
C
3
1
5
5
7
SWITCH
Q301
2
VR802-1
LEVEL
(REAR)
-15V REG
Q906,D906
• Signal path
: AUDIO (REAR)
(Page 7)
(Page 7)
(Page 7)
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