Schematic Diagram – Main Section (1/3) - Sony CFD-S28L Service Manual

CFD-S28L
Q Q
3 7 6 3 1 5 1 5 0
• Waveforms
– MAIN Board (1/3) –
1 Q323 Collector (REC mode) 4 Q301 Base (REC mode)
20 V/DIV, 20 µs/DIV 500 mV/DIV, 10 µs/DIV
34.4 Vp-p
20.8 µ s 20.8 µ s
2 Q322 Emitter, Base 5 Q301 Collector (REC mode)
Q323 Emitter, Base 1 V/DIV, 10 µs/DIV
Q324 Collector (REC mode)
5 V/DIV, 20 µs/DIV
9.8 Vp-p
20.8 µ s
T E
20.8 µ s L 1 3 9 4 2 2 9 6 5 1 3
3 Q324 Base, Q325 Collector (REC mode)
50 mV/DIV, 10 µs/DIV
128 mVp-p
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1 / W or less unless otherwise
4
specified.
• 2 : nonflammable resistor.
20.8 µ s
• C : panel designation.
Note: The components identified by mark ! or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
• U : B+ Line.
• Power voltage is dc 9 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : TAPE PLAY
( ) : TAPE REC
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
w w w
• 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
: TUNER (FM/MW/LW)
E : TAPE PLAY
a
: TAPE REC
J : CD PLAY
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6-7. SCHEMATIC DIAGRAM – MAIN Section (1/3) – •
1 Vp-p
3.6 Vp-p
x a o
. i
http://www.xiaoyu163.com
See page 45 for IC Block Diagrams.
Q Q
3 7
(Page 36)
(Page 28)
u 1 6 3
y
– 33 –
http://www.xiaoyu163.com
2 4
8 9 9
6 3 1 5 1 5 0 8 9
(Page 37)
m
c o
.
2
8 9 9
2 4 9 8 2 9 9
(Page 44)
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