Read Sony XM-444 Service Manual online
12
XM-444
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.
• 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
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