Table of Contents
Advertisement
5-3.
SCHEMATIC DIAGRAM •
See page 19 for IC Block Diagrams.
– 15 –
– 16 –
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
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
(
) : AM
[
] : PULSE
∗
: Impossible to measure
• 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
: FM
f
: AM
– 17 –
SRF-M75PM
• Waveforms
– KEY Board –
1 IC101 @¢ XOUT
200 mV/DIV, 10 µs/DIV
208 m Vp-p
13.3 µ s
2 Q103 Base-1, Collector-2
(RADIO ON mode)
200 mV/DIV, 100 ns/DIV
616 m Vp-p
243 ns
3 Q103 Collector-1 (RADIO ON mode)
2 V/DIV, 100 ns/DIV
4.9 Vp-p
243 ns
1
/
W or less unless otherwise
4
– 18 –
Advertisement
Table of Contents
