Read Sony ICF-C273 Service Manual online
11
11
ICF-C273
Note:
• X
: parts extracted from the component side.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
Note:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
f
: internal component.
Note: The components identified by mark
0
or dotted
line with mark
0
are critical for safety.
Replace only with part number specified.
• Voltages are dc with respect to ground under no-signal
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
e
: AM
4-1. IC Block Diagrams
IC1 CXA1019M
IC51 LC7213M-TLM-E
GND
GND
FM DISCRI
NF
VOL
AM OSC
AFC
FM OSC
REG OUT
FM RF
AM RF IN
N. C
FM RF IN
FE GND
MIX OUT
21
22
23
24
25
26
27
28
29
30
2
3
5
4
6
7
8
9
10
1
11
12
13
14
15
16
17
18
19
20
AF POWER AMP
AM IF DET AGC
AM FE
FM
DISCRIMINATOR
FM FE
TUNING
METER
FM IF
GND
GND
AF OUT
Vcc
RIPPLE
FILTER
AF IN
DET OUT
AFC AGC
AFC AGC
IF GND
METER
N. C
FM IF IN
AM IF IN
FM/AM
BAND
SELECT
OCB
I/F
1
CE
2
DI
3
CL
4
DO
16
PD
VSS
15
VDD
14
13
MO/ST
20
X OUT
18
LP-OU
T
17
LP-IN
19
X IN
5
NUTE
6
MW/L
W
7
BAND
8
ST
-IND
9
BAND
DATA SHIFT REGISTER
LATCH
UNIVERSAL
CONTROLER
SWALLOW COUNTER
1/16. 1/17 4 BITS
12 BIT PROGRAMBLE
DIVIDER
UNLOCK
DETECTOR
PHASE DETECTOR
CHARGE PUMP
FILTER
REFERENCE
DIVIDER
POWER
ON
RESET
1/2
10
IF-IN
12
FM-IN
AM-IN
11
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