Sony XM-SW3 Service Manual ▷ View online
XM-SW3
5
SECTION 2
DISASSEMBLY
• This set can be disassembled in the order shown below.
Note: Follow the disassembly procedure in the numerical order given.
2-1. BOTTOM PLATE
2-1. BOTTOM PLATE
(Page 5)
2-2. MAIN BOARD SECTION
(Page 6)
SET
2-3. MAIN BOARD
(Page 6)
4 bottom plate
1 three screws
(+B, TT, B-type, 3
uL)
2 three screws
(+B, TT, B-type, 3
uL)
3 screw
(+BVTP S3
u6)
XM-SW3
6
2-2. MAIN BOARD SECTION
2-3. MAIN BOARD
5 MAIN board section
main heat sink
3 three screws
(+P, TT, B-type, 3
uL)
4 screw
(+B, TT, B-type, 3
uL)
2 three screws
(+P, TT, B-type, 3
uL)
1 three screws
(+P, TT, B-type, 3
uL)
2 two screws
(+P, TT, B-type, 3
uL)
1 screw
(+P, TT, B-type, 3
uL)
4 screw
(+P, TT, B-type, 3
uL)
3 output panel
6 MAIN board
5 input panel
XM-SW3
7
SECTION 3
DIAGRAMS
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 Printed Wiring Boards.
Note:
• X : Parts extracted from the component side.
•
• X : Parts extracted from the component side.
•
: Pattern from the side which enables seeing.
For Schematic Diagrams.
Note:
• All capacitors are in
• All capacitors are in
μF unless otherwise noted. (p: pF) 50
WV or less are not indicated except for electrolytics and
tantalums.
tantalums.
• All resistors are in
Ω and 1/4 W or less unless otherwise
specifi ed.
• A : B+ Line.
• B : B– Line.
• H : Adjustment for repair.
• Power voltage is dc 14.4 V and fed with regulated dc
• B : B– Line.
• H : Adjustment for repair.
• Power voltage is dc 14.4 V and fed with regulated dc
power supply from +12 V and REM terminals.
• Voltages are dc with respect to ground under no-signal
conditions.
• Voltages are taken with VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
F
: AUDIO
Note: The components identifi ed by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specifi ed.
• Note for Replacement of the Transistors
The transistors Q159, 160, 259, 260, 359, 360, 459 and 460 have
two different ranks: P rank and Y rank.
The rank of these transistors need to be selected properly accord-
ing to each channel. When replacing any one of these transistors,
check its rank and replace with the appropriate transistor of the
same rank.
The transistors Q159, 160, 259, 260, 359, 360, 459 and 460 have
two different ranks: P rank and Y rank.
The rank of these transistors need to be selected properly accord-
ing to each channel. When replacing any one of these transistors,
check its rank and replace with the appropriate transistor of the
same rank.
Rank
Q159, 259, 359, 459
Q160, 260, 360, 460
P
2SC5100-P
(Part No. 8-729-024-79)
2SA1908-P
(Part No. 8-872-024-76)
Y
2SC5100-Y
(Part No. 8-729-024-80)
2SA1908-Y
(Part No. 8-872-024-77)
DISCRIMINATION:
A1908: 2SA1908
C5100: 2SC5100
C5100: 2SC5100
P: RANK P
Y: RANK Y
Y: RANK Y
XM-SW3
8
• IC Block Diagram
• Waveform
IC901 TL594INSR (MAIN Board (2/2))
1
IC901
5 (CT)
1 V/DIV, 10
Psec/DIV
3.1 Vp-p
18
Psec
0.1V
Q1
Q2
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7 8
NON
INV
VREF
VCC
C2
E1
E2
OUT
+IN
–IN
COMPEN
CT
RT
C1
GND
TIME
REF 5V
OSC
ERROR
ERROR
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