WM-FS420/FS420RS
6-3. SCHEMATIC DIAGRAM
1.7
1.7
0
0.6
0
0.1
0.6
0.6
2.6
(2.1)
(2.8)
(2.8)
(2.9)
*3: C40
68P: FS420RS
100P: FS420
*3
*2: R107, R207
220: FS420RS
150: FS420
*2
*2
2.1Vp-p
13.3µsec
500mV/div
5
µsec/div
+1.5V REG.
— 13 — — 14 —
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.
• 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 are dc with respect to ground under no-signal
(detuned) conditions.
no mark : PB
( ) : 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
E : PB
• Abbreviation
CND : Canadian model
MX : Mexican model
• Refer to page 10 for IC Block Diagrams.
• Refer to page 17 for IC Pin Function.
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