Read Sony XM-444W Service Manual online
12
12
XM-444W
IC901 µPC494GS-T1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
OSC
REF. REG.
ERROR
ERROR
0.1V
• IC Block Diagram
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
2
: nonflammable resistor.
•
A
: B+ Line.
•
B
: B– Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from +12V and REM terminals.
• Voltage is dc with respect to ground under no-signal
condition.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: AUDIO
for printed wiring boards:
• X
: parts extracted from the component side.
•
: Pattern from the side which enables seeing.
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
SECTION 4
EXPLODED VIEW
NOTE:
• The mechanical parts with no reference
number in the exploded views are not supplied.
• Items marked “*” are not stocked since
they are seldom required for routine service.
Some delay should be anticipated
when ordering these items.
Some delay should be anticipated
when ordering these items.
• Color Indication of Appearance Parts
Example :
KNOB, BALANCE (WHITE) ... (RED)
Parts Color Cabinet’s Color
• Accessories are given in the last of this parts list.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
R
R
1
3-240-650-01 PLATE, BOTTOM
2
3-238-669-01 PANEL, FRONT
3
3-238-668-21 HEAT SINK
4
3-238-670-01 PANEL, REAR
5
A-3274-222-A AMP BOARD, COMPLETE
6
7-685-646-79 SCREW +BVTP 3X8 TYPE2 IT-3
7
7-685-545-14 SCREW +BTP 3X6 TYPE2 N-S
8
3-240-642-01 HEAT SINK (SUB 2CH)
9
3-240-651-01 HEAT SINK (SUB 4CH)
10
3-225-184-01 SCREW (+PS.TT.3X6)
11
3-225-183-01 SCREW (+PSW.TT.3XL)
12
3-912-432-01 SCREW (+–B)
0 F901
1-533-743-11 FUSE (BLADE TYPE) (AUTO FUSE) 40A
The components identified by
mark 0 or dotted line with mark.
0 are critical for safety.
Replace only with part number
specified.
mark 0 or dotted line with mark.
0 are critical for safety.
Replace only with part number
specified.
• Semiconductor Location
D101
F-12
D102
F-11
D201
F-10
D202
F-9
D301
C-10
D302
C-11
D401
D-7
D402
C-8
D801
E-3
D802
E-6
D803
D-3
D804
E-4
D805
D-5
D806
D-5
D851
D-9
D852
D-9
D901
F-3
D902
F-4
D903
H-7
D904
H-6
D905
E-10
D906
D-10
IC801
E-12
IC802
G-13
IC803
F-12
IC804
D-11
IC805
C-11
IC806
B-12
IC851
D-3
IC901
E-4
LD801
E-3
Q101
F-11
Q102
F-11
Q103
F-11
Q104
G-11
Q105
F-11
Q106
H-11
Q107
G-10
Q108
F-11
Q109
F-10
Q110
H-11
Q111
H-10
Q112
G-12
Q201
E-9
Q202
F-9
Ref. No.
Location
Ref. No.
Location
Q203
F-9
Q204
G-9
Q205
F-9
Q206
H-8
Q207
G-8
Q208
F-8
Q209
F-8
Q210
H-9
Q211
H-8
Q212
F-10
Q301
D-10
Q302
C-10
Q303
C-10
Q304
C-10
Q305
C-10
Q306
B-9
Q307
C-9
Q308
C-9
Q309
C-9
Q310
B-9
Q311
B-10
Q312
D-9
Q401
D-10
Q402
C-8
Q403
C-8
Q404
C-7
Q405
C-7
Q406
B-7
Q407
B-7
Q408
C-6
Q409
C-7
Q410
B-6
Q411
B-7
Q412
B-6
Q801
E-3
Q802
E-3
Q803
D-2
Q851
D-10
Q852
D-4
Q853
D-4
Q901
F-3
Q902
E-4
Q903
H-5
Q904
H-4
Q905
E-10
Q906
E-10
Q907
F-6
Q908
G-6
1
2
3
F901
5
4
6
7
7
6
6
10
10
6
9
11
11
6
8
11
12
12
Click on the first or last page to see other XM-444W service manuals if exist.