Sony ICF-403S 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
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
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.
6 Install the chassis to the main board.
1 Turn the CV shaft all thye way counterclockwise.
2 Set the gear ASSY onto the CV shaft in a
2 Set the gear ASSY onto the CV shaft in a
direction as a figure.
3 Secure the gear ASSY with screw.
Gear (A),tuning capacitor
4
2
1
3
Stopper
Spring
(gear)
(gear)
Hole
A
Projection
Gear (B),tuning capacitor
B
Hole
Spring (gear)
3
Screw (1.7x3)
2
Gear ASSY
1
CV shaft
Main board
Knob (tune)
1 Put a point of spring (gear) in a hole of “gear (A), tuning
capacitor” and install it.
2 Install “gear (B), tuning capacitor” in a direction as a figure.
3 Turn the “gear (B), tuning capacitor” till a position of B fits
3 Turn the “gear (B), tuning capacitor” till a position of B fits
A.
4 Hang the spring (gear) with a stopper.
SECTION 4
ELECTRICAL ADJUSTMENTS
TUNER SECTION
MW Section
Procedure :
BAND : MW
SW Section
Procedure :
BAND : SW
FM Section
Procedure :
BAND : FM
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.
•
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.
< > : Saudi Arabia 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
620kHz
CT1
1,400kHz
SW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
5.8MHz
CT6
18.5MHz
SW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
5.8MHz
CT5
18.5MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
86.5MHz
<87.35MHz>
CT3
109.5MHz <108.25MHz>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.5MHz
<87.35MHz>
CT2
109.5MHz <108.25MHz>
L6 : SW Frequency Coverage Adjustment
CT3 : FM Frequency Coverage Adjustment
L4 : FM Frequency Coverage Adjustment
L5 : MW Frequency Coverage Adjustment
CT6 : SW Frequency Coverage Adjustment
CT4 : MW Frequency Coverage Adjustment
T1 : AM IF Adjustment
L1 : MW Tracking Adjustment
CT1 : MW Tracking Adjustment
CT2 : FM Tracking Adjustment
CT5 : SW Tracking Adjustment
L2 : SW Tracking Adjustment
L3 : FM Tracking Adjustment
Adjustment Location : Main board (Component side)
AM RF signal
generator
generator
12PF
30% amplitude modulation by
400Hz signal.
Output level : as low as possible
400Hz signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
set
32
Ω
phone jack (J1)
level meter
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
0dB=1
µ
V
– 7 –
– 8 –
ICF-403S
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
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.
02
2
1
3
4
5
6
7
8
9
A
B
C
D
D3
TUNE
S2
TONE
HIGH
LOW
RV1
POWER/VOL
R3
C30
C23
R6
C22
C28
C25
R13
C18
R9
R2
C6
C5
C2
C1
C3
C9
C11
C27
C42
C13
C15
C31
C24
R1
R5
R10
R11
DC IN 4.5V
[MAIN BOARD]
ANT1
FM/SW TELESCOPIC ANTENNA
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
3PCS, 4.5V
CT6
CT5
CV1-4
TUNING
L6
L2
L5
-1
-2
-4
-5
-6
-3
S1
SW N MW N FM
L3
L4
JW1
JW2
JW7
BPF1
1
5
10
15
16
20
26
30
IC1
JW5
JW4
JW8
JW3
JW6
JW15
JW14
C7
C8
CF3
C14
C21
C26
C29
C16
C20
C19
C32
JW10
JW11
JW12
JW13
CF2
CF1
T1
BCE Q1
D2 D1
L1
MW FERRITE-ROD ANTENNA
11
(11)
1-674-016-
J2
SP1
SPEAKER
–
+
J1
@
@
JW9
CV1 CV2
CV3
CV4
CT3
CT4
CT1
CT2
EXCEPT EA MODEL
Note:
•
X
: parts extracted from the component side.
•
¢
: internal component.
•
b
: Pattern from the side which enables seeing.
• Abbreviation
EA
: Saudi Arabia
IC1 CXA1019S
– 9 –
– 10 –
5-2. SCHEMATIC DIAGRAM
ICF-403S
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.
• 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) condi-
tions.
no mark : FM
(
no mark : FM
(
) : MW
<
> : SW
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production tolerances.
• Signal path.
F
: FM
f
: MW
h
: SW
• Abbreviation
EA : Saudi Arabia
– 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
EA : Saudi Arabia
7
not supplied
6
8
11
1
2
3
4
5
4
12
10
9
ANT1
SP1
6
1
3-037-016-01 CABINET (FRONT) (BLACK)
1
3-037-016-11 CABINET (FRONT) (WHITE) (AEP)
2
3-037-026-01 PLATE, TRANSPARENT (EXCEPT EA)
2
3-037-026-11 PLATE, TRANSPARENT (EA)
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
ANT1
1-501-222-81 ANTENNA, TELESCOPIC (FM, SW)
SP1
1-529-451-11 SPEAKER (7.7cm)
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
6-2. CHASSIS SECTION
63
64
65
62
66
67
51
52
55
56
58
59
60
61
69
68
57
53
54
D3
51
3-037-023-01 KNOB(TONE) (BLACK)
51
3-037-023-11 KNOB(TONE) (WHITE) (AEP)
* 52
1-674-032-11 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-3663-363-A MAIN BOARD, COMPLETE (EXCEPT EA)
* 58
A-3663-380-A MAIN BOARD, COMPLETE (EA)
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)
67
3-037-523-01 PIN(TUNING CAPACITOR)
68
3-037-033-01 SPRING (GEAR)
69
3-037-032-01 GEAR(B), TUNING CAPACITOR
D3
8-719-069-94 LED TLR124 (TUNE)
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