Main Board; Led Board; Diagrams; Ic Block Diagram - Sony XM-280gtx Service Manual

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3 7 6 3 1 5 1 5 0

2-4. MAIN BOARD

3 P 3x8
2 P 3x8
1 P 3x8
T E
L 1 3 9 4 2 2 9 6 5 1 3

2-5. LED BOARD

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5 MAIN board
4 panel (front)
1 P 3x6
2 LED board
heat sink (main)
x a o u 1 6 3
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3 7 6 3 1 5 1
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9 9
SECTION 3

DIAGRAMS

2 4 2
9 8
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
1
• All resistors are in Ω and / W or less unless otherwise
4
specified.
• % : indicates tolerance.
• 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 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: AUDIO
for printed wiring boards:
Note:
• X : parts extracted from the component side.
• : Pattern from the side which enables seeing.
(The other layer's patterns are not indicated.)
5 0 8 9 2 4 9 8 2
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.

3-1. IC BLOCK DIAGRAM

IC8 TL494CN
16 15 14 13
ERROR
0.1V
ERROR
1 2 3 4
m
• Waveform
1V/DIV, 5µsec/DIV
1
IC8
XM-280GTX
9 9
9 9
12 11 10 9
REF 5V
OSC
5 6 7 8
3.4Vp-p
15µsec
5