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 M
Ω
).
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
5
µ
sec/1Vdiv
0.2
µ
sec/2Vdiv
75kHz
3MHz
TP4
(76k)
4p
PLL LOW-PASS
FILTER
100k
S301
— 9 —
— 10 —
— 11 —
• Refer to page 13 for IC Block Diagrams.
