Sony ICF-403L Service Manual ▷ View online
– 5 –
– 6 –
SECTION 3
DIAL POINTER INSTALLATION
Note :
Follow the installation procedure in the numerical order given.
1
Rack
6
Rack
5
Knob (tone)
5
3
Knob (tune)
2
Pointer
Chassis
Chassis
4
Scribed line
Claws
Main board
S2
3
Screw (1.7x3)
2
Gear (A),tuning capacitor
1
CV shaft
Main board
Knob (tune)
1 Insert the rack into the chassis groove.
2 Install the pointer.
3 Install the knob (tune).
4 Slide the rack and align it with the groove on the scribed line.
5 Align the knob (tone) and the S2.
6 Install the chassis to the main board.
2 Install the pointer.
3 Install the knob (tune).
4 Slide the rack and align it with the groove on the scribed line.
5 Align the knob (tone) and the S2.
6 Install the chassis to the main board.
1 Turn the CV shaft all thye way counterclockwise.
2 Set the gear (A), tuning capacitor onto the CV shaft in a
2 Set the gear (A), tuning capacitor onto the CV shaft in a
direction as a figure.
3 Secure the gear (A), tuning capacitor with screw.
SECTION 4
ELECTRICAL ADJUSTMENTS
TUNER SECTION
MW/LW Section
Procedure :
BAND
: MW/LW
VOLUME : MIN
FM Section
Procedure :
BAND
: FM
VOLUME : MIN
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
FM RF signal
generator
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
400Hz signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
0.01
µ
F
set
32
Ω
phone jack (J1)
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.
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
< > : East European model
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
520kHz
CT4
1,650kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1-1
620kHz
CT1
1,400kHz
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
Confirm
145kHz
CT5
260kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1-2
160kHz
CT6
240kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
86.5MHz <64.0MHz>
CT3
109.5MHz <109.5MHz>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.5MHz <68.0MHz>
CT2
109.5MHz <102.0MHz>
L5 : MW Frequency Coverage Adjustment
CT3 : FM Frequency Coverage Adjustment
L4 : FM Frequency Coverage Adjustment
CT5 : LW Frequency Coverage Adjustment
CT4 : MW Frequency Coverage Adjustment
L1-2 : LW Tracking Adjustment
T1 : AM IF Adjustment
L1-1 : MW Tracking Adjustment
CT1 : MW Tracking Adjustment
CT2 : FM Tracking Adjustment
CT6 : LW Tracking Adjustment
L3 : FM Tracking Adjustment
Adjustment Location : Main board (Component side)
– 7 –
– 8 –
ICF-403L
5-1. PRINTED WIRING BOARDS
D1
B-7
D2
B-7
D3
A-2
IC1
C-4
Q1
C-5
Ref. No.
Location
r
Semiconductor
Location
SECTION 5
DIAGRAMS
02
2
1
3
4
5
6
7
8
9
A
B
C
D
D3
TUNE
S2
TONE
HIGH
LOW
JW16
RV1
POWER/VOL
R3
C23
C28
R6
C22
C25
C43 : EE MODEL
JC1 : AEP MODEL
JC1 : AEP MODEL
C18
C46
R9
C40
R2
C27
C4
C37
C6
C5
C2
C13
C15
C44
C39
C31
C45
C10
C24
C47
R1
R7
R12
R5
R10
R11
DC IN 4.5V
[MAIN BOARD]
ANT1
FM TELESCOPIC ANTENNA
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
3PCS, 4.5V
CT6
CT5
CV1-4
TUNING
L5
-1
-2
-4
-3
S1
LW N MW N FM
L3
L4
JW1
JW7
BPF1
1
5
10
15
16
20
30
IC1
JW5
JW8
JW6
CF3
C14
C21
C26
C29
C16
C20
C19
C32
JW10
JW11
JW12
JW13
CF2
CF1
T1
BCE
Q1
D2 D1
L1
MW/LW FERRITE-ROD ANTENNA
21
(21)
1-674-016-
J2
SP1
SPEAKER
–
+
J1
@
JW9
CV1 CV2
CV3
CV4
CT3
CT4
CT1
CT2
EE MODEL
EE MODEL
EE MODEL
-1
-2
Note:
• X
: parts extracted from the component side.
• b
: Pattern from the side which enables seeing.
• Abbreviation
EE
: East European
GND
GND
FM DISCRI
NF
VOL
AM OSC
AFC
FM OSC
Reg OUT
FM RF
AM ANT
N. C
FM ANT
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
LED
N. C
FM IF IN
AM IF IN
FM/AM
BAND
SELECT
r
IC Block Diagram.
IC1 CXA1019S
– 9 –
– 10 –
5-2. SCHEMATIC DIAGRAM
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.
•
¢
: internal component.
•
U
: B+ Line.
•
H
: adjustment for repair.
ICF-403L
• Power voltage is dc 4.5V and fed with regulated dc power
supply from battery terminal (J2).
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
(
no mark : FM
(
) : MW
<
> : LW
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Signal path.
F
: FM
f
: MW
L
: LW
• Abbreviation
EE
: East European
– 11 –
– 12 –
SECTION 6
EXPLODED VIEWS
NOTE :
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Color indication of Appearance Parts
Example :
KNOB, BALANCE (WHITE) ••• (RED)
KNOB, BALANCE (WHITE) ••• (RED)
↑
↑
Parts color Cabinet's color
• Items marked “ * ”are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference
number in the exploded views are not
supplied.
supplied.
• Hardware (# mark) list and accessories and
packing materials are given in the last of this
parts list.
parts list.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
6-1. CABINET SECTION
• Abbreviation
EE : East European
1
3-037-016-01 CABINET (FRONT) (BLACK)
1
3-037-016-11 CABINET (FRONT) (WHITE) (AEP)
2
3-037-026-21 PLATE, TRANSPARENT (AEP)
2
3-037-026-31 PLATE, TRANSPARENT (EE)
3
3-037-029-01 PANEL(SPEAKER) (BLACK)
3
3-037-029-11 PANEL(SPEAKER) (WHITE) (AEP)
4
7-685-134-19 SCREW +P 2.6X8 TYPE2 NON-SLIT
5
7-623-508-01 LUG,3
6
7-685-548-14 SCREW +BTP
3X12 TYPE2 N-S
7
3-037-024-01 HANDLE (BLACK)
7
3-037-024-11 HANDLE (WHITE) (AEP)
8
3-037-017-01 CABINET (REAR) (BLACK)
8
3-037-017-11 CABINET (REAR) (WHITE) (AEP)
9
3-037-034-01 SPRING (HANDLE)
10
3-037-019-01 LID,BATTERY CASE (BLACK)
10
3-037-019-11 LID,BATTERY CASE (WHITE) (AEP)
11
3-372-124-01 CUSHION (BATTERY)
12
3-040-489-01 SHEET, SPEAKER (WHITE) (AEP)
ANT1
1-501-222-81 ANTENNA, TELESCOPIC (FM)
SP1
1-529-451-11 SPEAKER (7.7cm)
7
not supplied
6
8
11
1
2
3
4
5
4
12
10
9
ANT1
SP1
6
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
51
3-037-023-01 KNOB(TONE) (BLACK)
51
3-037-023-11 KNOB(TONE) (WHITE) (AEP)
* 52
1-674-032-21 RACK RETAINER BOARD
53
3-037-021-01 KNOB(BAND) (BLACK)
53
3-037-021-11 KNOB(BAND) (WHITE) (AEP)
54
3-037-025-01 POINTER
55
3-369-170-01 RACK
* 56
3-037-018-01 CHASSIS
57
3-037-030-01 TERMINAL (+), BATTERY
* 58
A-3663-364-A MAIN BOARD, COMPLETE (AEP)
* 58
A-3663-383-A MAIN BOARD, COMPLETE (EE)
59
3-037-028-01 HOLDER, LED
60
7-685-134-19 SCREW +P 2.6X8 TYPE2 NON-SLIT
61
3-364-941-11 SCREW (+B) (2.6X5), NYLOK
62
3-037-027-01 GEAR(A), TUNING CAPACITOR
63
3-037-031-01 TERMINAL (-), BATTERY
64
3-037-020-01 KNOB(VOL) (BLACK)
64
3-037-020-11 KNOB(VOL) (WHITE) (AEP)
65
3-880-990-00 SCREW (1.7X3),FLAT,(+) SPECIAL
66
3-037-022-01 KNOB(TUNE) (BLACK)
66
3-037-022-11 KNOB(TUNE) (WHITE) (AEP)
D3
8-719-069-94 LED TLR124 (TUNE)
6-2. CHASSIS SECTION
63
64
65
62
66
51
52
55
56
58
59
60
61
57
53
54
D3
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