Read Sony ICF-R40 Service Manual online
ICF-R40
– 11 –
– 12 –
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
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 are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
(
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.
tion tolerances.
• Signal path.
F
: FM
f
: AM
5-3.
SCHEMATIC DIAGRAM
• IC Block Diagrams
IC1
CXA1280N
IC2
BU2305F-E2
GND
GND
AF OUT
VCC
RIPPLE FIL
TER
AF IN
DET
AFC AGC
AFC AGC
GND
METER
NC
FM IF
AM IF
BAND
GND
GND
DISCRI
NF
VOL
AM OSC
AFC
FM OSC
REG
FM RF
AM ANT
NC
FM RF IN
GND
MIX OUT
30 29
28 27 26
25
24
23
22
21 20
19
18 17 16
12 13 14 15
8 9 10
11
4 5
6
1
2
3
7
AF POWER
AMP
AM IF AMP,
DET, AGC
TUNING
METER
FM IF
AMP
AM
FRONT-END
FM
FRONT-END
FM
DISCRIMINATOR
OSC1
OSC2
OSC3
GND
VCC
SET
RESET
OUT
8
4
5
6
1
2
3
7
23 BIT
COUNTER
CHATTERING
PROTECTOR
CONTROL
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