Sony CFD-S28 - Cd Radio Cassette-corder, Руководство по обслуживанию, Страница: 3 / 10

CFD-S28
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6-7. SCHEMATIC DIAGRAM – MAIN Section (1/3) – • See page 45 for IC Block Diagrams. • Waveforms
– MAIN Board (1/3) –
1 Q323 Collector (REC mode)
20 V/DIV, 20 µs/DIV
2
Q322 Emitter, Base
Q323 Emitter, Base
Q324 Collector (REC mode)
5 V/DIV, 20 µs/DIV
3 Q324 Base, Q325 Collector (REC mode)
50 mV/DIV, 10 µs/DIV
4
Q301 Base (REC mode)
500 mV/DIV, 10 µs/DIV
5
Q301 Collector (REC mode)
1 V/DIV, 10 µs/DIV
34.4 Vp-p
20.8
µ
s
9.8 Vp-p
20.8
µ
s
128 mVp-p
20.8
µ
s
1 Vp-p
20.8
µ
s
20.8
µ
s
3.6 Vp-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 /
4
W or less unless otherwise
specified.
•
2
: nonflammable resistor.
• C : panel designation.
• 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 M
Ω
).
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
: TUNER (FM/AM)
E : TAPE PLAY
a : TAPE REC
J : CD PLAY
Note: The components identified by mark ! or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
(Page 28)
(Page 36)
(Page 37)
(Page 44)