SRF-R405
4-3. SCHEMATIC DIAGRAMS
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.
•
¢
: 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
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F : FM
f : AM
• Waveform
1
IC506 @• (X OUT)
2
Q601 C
5µsec/1Vdiv
0.2µsec/2Vdiv
75kHz
3MHz
TP4
(76k)
4p
PLL LOW-PASS
FILTER
100k
S301
— 9 — — 10 — — 11 —
• Refer to page 13 for IC Block Diagrams.
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