Sony XM-440EX / XM-440NX Service Manual ▷ View online
5
6
SECTION 2
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
2-1. MAIN BOARD REMOVAL
1
Two screws (+BTP3x4)
2
Two screws (+BTP3x4)
3
Bottom plate
4
Screw
(+BTP3x8)
5
Two screws
(+BTP3x6)
7
Two screws
(+BTP3x8)
9
Screw
(+BTP3x4)
0
Screw
(+BTP3x4)
qa
Main board
(Remove the direction of arrow)
8
Two screws
(+BTP3x8)
6
Two screws
(+BTP3x6)
Heat sink
XM-440EX/440NX
7
7
SECTION 3
DIAGRAMS
3-1. BLOCK DIAGRAM
DIFFERENTIAL
AMP
Q263
6
7
PRE
AMP
IC101 (2/2)
IC202 (1/2)
CN303
INPUT
FILTER
L
(MONO)
HIGH
LEVEL
INPUT
INPUT
L
R
5
2
FILTER
CN904
IC203 (1/2)
3
3
1
H.P.F
IC202 (2/2)
6
7
L.P.F
RV101 (2/4)
FILTER
SW101 (2/2)
LEVEL
RV102
HPF
RV101 (4/4)
IC203 (2/2)
6
7
L.P.F
FILTER
OFF
LPF
1
DRIVE AMP
Q204
DRIVE AMP
Q204
DRIVE AMP
Q204
DRIVE AMP
Q204
DIFFERENTIAL
AMP
Q263
DRIVE AMP
Q204
DRIVE AMP
Q204
DRIVE AMP
Q204
DIFFERENTIAL
AMP
Q202
REAR
SPEAKER
OUT
REAR
DIFFERENTIAL
AMP
Q263
7
PRE
AMP
IC101 (2/2)
IC202 (1/2)
INPUT
CNJ301
(3/4)
(3/4)
CNJ301
(4/4)
(4/4)
FILTER
R
5
2
FILTER
IC203 (1/2)
3
3
1
H.P.F
IC202 (2/2)
6
7
L.P.F
RV101 (2/4)
FILTER
SW101 (2/2)
LEVEL
RV102
HPF
RV101 (4/4)
IC203 (2/2)
6
7
L.P.F
FILTER
OFF
LPF
1
DRIVE AMP
Q204
DRIVE AMP
Q204
DRIVE AMP
Q204
DRIVE AMP
Q204
6
DIFFERENTIAL
AMP
Q203
6
7
PRE
AMP
IC101 (2/2)
IC202 (1/2)
CN302
INPUT
FILTER
L
(MONO)
HIGH
LEVEL
INPUT
INPUT
L
R
5
3
FILTER
IC203 (1/2)
2
3
1
H.P.F
IC202 (2/2)
6
7
L.P.F
RV101 (2/4)
TEST TONE
SW501
TO REAR
FILTER
SW101 (2/2)
LEVEL
RV102
HPF
RV101 (4/4)
IC203 (2/2)
6
7
L.P.F
FILTER
OFF
LPF
DRIVE AMP
Q204
DRIVE AMP
Q208
BIAS
Q206,207
POWER AMP
Q210
DIFFERENTIAL
AMP
Q202
DRIVE AMP
Q205
DRIVE AMP
Q209
POWER AMP
Q211
OVER ROAD
DET
Q212
L
L+R
FRONT
R
DIFFERENTIAL
AMP
Q103
1
PRE
AMP
IC101 (1/2)
IC102(1/2)
+B
INPUT
CNJ301
(1/4)
(1/4)
CNJ301
(2/4)
(2/4)
FILTER
R
2
3
FILTER
LINE
SWITCH
Q101
LINE
SWITCH
Q201
IC103 (1/2)
2
3
1
H.P.F
IC102 (2/2)
6
7
L.P.F
RV101 (1/4)
FILTER
SW101 (1/2)
LEVEL
RV102
HPF
RV101 (3/4)
IC103 (2/2)
6
7
L.P.F
FILTER
OFF
LPF
DRIVE AMP
Q104
DRIVE AMP
Q108
BIAS
Q106,107
POWER AMP
Q110
DIFFERENTIAL
AMP
Q102
DRIVE AMP
Q105
DRIVE AMP
Q109
POWER AMP
Q111
OVER ROAD
DET
Q112
3
1
OP AMP
OP AMP
IC501 (2/2)
2
3
7
IC501 (1/2)
5
6
CN901
REMOTE
11
10
1
2
15
3
8
9
12
REF-REG
INVERTER
Q918
INVERTER
Q917
D904
DRIVER
Q915
T901
DC-DC CONVERTER
TRANSFORMER
PROTECTOR
Q904,905
D908
D910
B3+
B1+
B2+
B1-
B2-
B3-
D911
DC DET
PH902
DC-DC
CONVERTER
IC901
16
DRIVER
Q916
+12V
GND
09
POWER
ON/OFF
Q903
+B
SWITCH
Q901,902
TEMP • DET
TH902,903
LINE CONTROL
Q921,922
POWER/
PROTECTOR
THERMAL
LED
DRIVE
Q908
14
LED
DRIVE
Q906,907
OFFSET
DET
Q923-925
B+REG
Q919
B-REG
Q920
L
R
CN903
MONO
L+R MONO
1
1
D905
POWER/
PROTECTOR
OVER CURRENT
D907
POWER/
PROTECTOR
OFF SET
D906
SWITCH
Q909,910
SWITCH
Q911,912
SWITCH
Q913,914
(REAR)
• Signal path
F
: AUDIO
FRONT
SPEAKER
OUT
8
XM-440EX/440NX
8
• IC BLOCK DIAGRAM
IC901 TL494CN
• WAVEFORMS
1
2
3
4
12.8Vp-p
31
µ
sec
12Vp-p
31
µ
sec
28Vp-p
31
µ
sec
56Vp-p
31
µ
sec
4
1
2
3
5
6
7 8
9
10
16 15
14
13
12 11
ERROR
0.1V
REG.
REF.
OSC
ERROR
THIS NOTE IS COMMON FOR
PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS.
(In addition to this, the necessary
note is printed in each block.)
PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS.
(In addition to this, the necessary
note is printed in each block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise
• All capacitors are in µF unless otherwise
noted. pF: µµF 50 WV or less are not in-
dicated except for electrolytics and
tantalums.
dicated except for electrolytics and
tantalums.
• All resistors are in
Ω
and
1
/
4
W or less un-
less otherwise specified.
•
C
: panel designation.
•
U
: B+ Line.
• Power voltage is dc 14.4V and fed with
regulated dc power supply from ACC and
BATT cords.
BATT cords.
• Voltages and waveforms are dc with re-
spect to ground under no-signal condi-
tions.
no mark : POWER ON
tions.
no mark : POWER ON
*
: Impossible to measure
• Voltage are taken with a VOM (Input im-
pedance 10 M
Ω
).
Voltage variations may be noted due to
normal production tolerances.
normal production tolerances.
• Signal path.
F
: AUDIO
For printed wiring boards.
Note:
•
X
: parts extracted from the compo-
nent side.
Click on the first or last page to see other XM-440EX / XM-440NX service manuals if exist.