Read Sony SRF-M73 Service Manual online
SRF-M73
– 13 –
– 14 –
– 15 –
– 16 –
• Waveforms
– KEY Board –
– KEY Board –
1
IC101
@¢
XOUT
200 mV/DIV, 10 µs/DIV
5-3.
SCHEMATIC DIAGRAM
•
See page 17 for IC Block Diagrams.
2
Q103 Base-1, Collector-2
(RADIO ON mode)
200 mV/DIV, 100 ns/DIV
(RADIO ON mode)
200 mV/DIV, 100 ns/DIV
3
Q103 Collector-1 (RADIO ON mode)
2 V/DIV, 100 ns/DIV
2 V/DIV, 100 ns/DIV
208 m Vp-p
13.3
µ
s
616 m Vp-p
243 ns
4.9 Vp-p
243 ns
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 3 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : AM
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM
FM FREE-RUN
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