Table of Contents
Advertisement
5-3.
SCHEMATIC DIAGRAM
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
/
W or less unless otherwise
4
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 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
– 11 –
• IC Block Diagrams
IC1 CXA1280N
30 29
28 27 26
25
24
23
22
21 20
19
AF POWER
AM IF AMP,
AMP
DET, AGC
TUNING
METER
AM
FRONT-END
FM
DISCRIMINATOR
FM
FRONT-END
1
2
3
4 5
6
7
8 9 10
11
12 13 14 15
IC2 BU2305F-E2
8
VCC
OSC1
1
23 BIT
7
OUT
COUNTER
OSC2
2
CHATTERING
6
SET
PROTECTOR
OSC3
3
CONTROL
5
RESET
GND
4
– 12 –
ICF-R40
18 17 16
FM IF
AMP
Advertisement
Table of Contents
