Sony ICF-303 / ICF-303L Service Manual ▷ View online
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
400Hz, 30%
AM modulation
Output level: as low as possible
AM modulation
Output level: as low as possible
16
Ω
set
earphone jack (EPJ1)
level meter
– 5 –
– 6 –
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L5
145 kHz
CT1
265 kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
160 kHz
CT2
240 kHz
Adjustment Location: MAIN BOARD
ICF-303L:
LW SECTION
BAND switch : LW
(303L)
(303L)
CT2
LW TRACKING( 303L)
ADJUSTMENT
CT1-1
AM TRACKING (303)
ADJUSTMENT
CT1-4
AM FREQUENCY
COVERAGE (303)
ADJUSTMENT
L2
FM TRACKING
ADJUSTMENT
L4
FM FREQUENCY
COVERAGE
ADJUSTMENT
L5
AM FREQUENCY COVERAGE (303)
LW FREQUENCY COVERAGE (303L)
ADJUSTMENT
CT1-2
FM TRACKING
ADJUSTMENT
MAIN BOARD (COMPONENT SIDE)
CT1
LW FREQUENCY
COVERAGE (303L)
ADJUSTMENT
CT1-3
FM FREQUENCY
COVERAGE
ADJUSTMENT
L1
AM TRACKING (303)
LW TRACKING (303L)
ADJUSTMENT
16
Ω
set
earphone jack (EPJ1)
level meter
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
400Hz, 30%
AM modulation
Output level: as low as possible
AM modulation
Output level: as low as possible
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
ICF-303:
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
86.5 (87.35)
<64> MHz
CT1-3
109.5 (108.25) MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
86.5 (87.35)
<68> MHz
CT1-2
109.5 (108.25)
<102> MHz
NOTE :
( ) : Italian model
< > : East European model
< > : East European model
ICF-303L:
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
86.5 MHz
CT1-3
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
86.5 MHz
CT1-2
109.5 MHz
SECTION 3
ELECTRICAL ADJUSTMENTS
FM SECTION
BAND switch : FM
telescopic
antenna terminal
antenna terminal
0.01
µ
F
FM RF signal
generator
generator
400Hz, 30% FM modulation
frequency deviation
frequency deviation
±
22.5kHz
Output level: as low as possible
set
16
Ω
set
earphone jack (EPJ1)
level meter
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L5
520 (516.5) kHz
CT1-4
1,650 (1,631.5) kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
600 (620) kHz
CT1-1
1,400 kHz
NOTE :
no mark : ( ) : Italian model
ICF-303:
AM SECTION
BAND switch : AM
ICF-303/303L
– 7 –
– 8 –
4-1. PRINTED WIRING BOARD
1
A
B
C
D
E
F
G
2
3
4
5
6
7
8
9
10
11
12
13
1-638-452-
11
MAIN BOARD
R4
C15
R6
C9
R9
C13
C17
R7
C18
C24
R2
C4
C3
C8
CF1
CT1
LW OSC
C19
C21
C23
C6
R8
C2
R3
J3
R1
J2
J4
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
2PCS,3V
C14
C16
C12
C11
C20
S1
(BAND)
LW FM
AM
(303)
(303L)
TUNE
303L
303L
LW ANT
CT2
L2
L7
L6
ANT 1
FM TELESCOPIC
ANTENNA
SP 1
SPEAKER
WHT
RED
RED
WHT
EPJ1
(EARPHONE)
L4
CF3
C5
303L
303
303L
CT1-2
CT1-3
CT1-1
CT1-4
30
16
21
25
1
5
15
10
T1
AM IF
CF2
BPF1
IC1
-1
-2
-3
-4
L5
AM OSC(303)
LW OSC(303L)
AM OSC(303)
LW OSC(303L)
RV1-2
VOL
RV1-1
RV1
POWER
04
SHIELD PLATE
BLK
RED
BLU
BLK
BLU
BLK
RED
RED
BLU
CLEAR
CLEAR
CLEAR
LW FERRITE-ROD ANTENNA(303L)
D3
303L
303L
RF IN(+)
DET OUT
RF IN(-)
B+
GND
FM
ANT
WHT
SP(+)
SP( )
CV1
TUNING
L1
BLK
RED
BLU
CLEAR
AM FERRITE-ROD ANTENNA(303)
L1
(303L)
(303)
1
3
Note:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
p
: parts mounted on the conductor side.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
SECTION 4
DIAGRAMS
4-2. SCHEMATIC DIAGRAM
– 9 –
– 10 –
ICF-303/303L
Note:
• 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.
• Total current is measured with power on.
• Power voltage is dc 3 V and fed with regulated dc power
• Power voltage is dc 3 V and fed with regulated dc power
supply from battery terminal.
• Voltage is dc with respect to ground under no-signal
(detuned) condition.
no mark : FM
(
no mark : FM
(
) : AM or LW
• 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
• Abbreviation
IT
: Italian model
EE
: East European model
EA
: Saudi Arabia model
2
1
3
13
4
5
6
7
8
9
10
11
12
27
14
15
16
17
18
19
20
21
22
23
24
25
26
8
ANT1
SP1
D3
not supplied
L1
SECTION 5
EXPLODED VIEW
NOTE:
• The mechanical parts with no reference
number in the exploded views are not supplied.
• Items marked “*” are not stocked since
they are seldom required for routine service.
Some delay should be anticipated
when ordering these items.
Some delay should be anticipated
when ordering these items.
• Color Indication of Appearance Parts
Example :
KNOB, BALANCE (WHITE) ... (RED)
Parts Color Cabinet’s Color
• Accessories and packing materials are given in
the last of this parts list.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
• Abbreviation
EE : East European model
IT : Italian model
EA : Saudi Arabia model
IT : Italian model
EA : Saudi Arabia model
– 11 –
1
3-037-044-01 PLATE, TRANSPARENT (303:EXCEPT EE,IT,EA)
1
3-037-044-11 PLATE, TRANSPARENT (IT,EA)
1
3-037-044-21 PLATE, TRANSPARENT (EE)
1
3-037-044-31 PLATE, TRANSPARENT (303L)
2
3-037-046-01 PANEL (SPEAKER) (BLACK)
2
3-037-046-11 PANEL (SPEAKER) (WHITE) (EXCEPT EE)
3
3-037-038-01 CABINET (FRONT) (BLACK)
3
3-037-038-11 CABINET (FRONT) (WHITE) (EXCEPT EE)
4
3-037-045-01 HOLDER, JACK
5
3-037-043-01 HOLDER, LED
6
3-037-020-01 KNOB (POWER/VOL) (BLACK)
6
3-037-020-11 KNOB (POWER/VOL) (WHITE) (EXCEPT EE)
7
3-037-048-01 TERMINAL (–), BATTERY
8
3-880-990-00 SCREW (1.7X3), FLAT, (+) SPECIAL
* 9
A-3663-369-A MAIN BOARD, COMPLETE
(303:EXCEPT EE,IT,EA)
* 9
A-3663-372-A MAIN BOARD, COMPLETE (303L)
* 9
A-3663-375-A MAIN BOARD, COMPLETE (EE)
* 9
A-3663-378-A MAIN BOARD, COMPLETE (IT,EA)
10
3-371-765-21 SCREW (2X8), +BTP
11
3-369-171-01 GEAR (TUNING CAPACITOR)
12
3-037-047-01 TERMINAL (+), BATTERY
13
3-040-693-01 SHEET, SPEAKER (for WHITE)
14
3-037-025-11 POINTER
15
3-369-170-01 RACK
* 16
3-037-040-01 CHASSIS
* 17
3-037-706-01 PLATE, RACK RETAINER
18
3-037-041-01 KNOB (TUNE) (BLACK)
18
3-037-041-11 KNOB (TUNE) (WHITE) (EXCEPT EE)
19
3-318-203-61 SCREW (B1.7X4), TAPPING
20
7-623-505-01 LUG, 2.6
21
3-037-039-01 CABINET (REAR) (BLACK)
21
3-037-039-11 CABINET (REAR) (WHITE) (EXCEPT EE)
22
3-372-124-01 CUSHION (BATTERY)
23
3-037-024-01 HANDLE (BLACK)
23
3-037-024-11 HANDLE (WHITE) (EXCEPT EE)
24
7-685-136-19 SCREW +P 2.6X12 TYPE2 N-S
25
3-037-034-01 SPRING (HANDLE)
26
3-037-019-01 LID, BATTERY CASE (BLACK)
26
3-037-019-11 LID, BATTERY CASE (WHITE) (EXCEPT EE)
27
3-037-042-01 KNOB (BAND) (BLACK)
27
3-037-042-11 KNOB (BAND) (WHITE) (EXCEPT EE)
ANT1
1-501-247-21 ANTENNA, TELESCOPIC
D3
8-719-069-94 LED TLR124 (TUNE)
L1
1-402-566-11 ANTENNA, FERRITE-ROD (AM) (303)
L1
1-402-567-11 ANTENNA, FERRITE-ROD (LW) (303L)
SP1
1-529-456-11 SPEAKER (6.6cm)
R
R
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