Sony icf-28 User manual
MICROFILM
SERVICE MANUAL
FM/AM RADIO
AEP Model
UK Model
E Model
Australian Model
ICF-28
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED
LINE WITH MARK !ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
SPECIFICATIONS
CF2
CF3
mark
Mark Center frequency
red 10.70 MHz
blue 10.67 MHz
orange 10.73 MHz
black 10.64 MHz
white 10.76 MHz
HOWTO CHANGETHE CERAMIC FILTERS
This model is used two ceramic filters of CF2 and CF3.
You must used same type of color marked ceramic filters in order
to meet same specifications.
Therefore, the ceramic filter must changed two pieces together
since it's supply two pieces in one package as a spare parts.
Ver 1.1 1998. 09
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
– 3 – – 4 –
0 dB = 1µV
[FM]
Setting:
Band switch: FM
[AM]
Setting:
Band switch: AM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
• Remove FM antenna in FM adjustments.
Adjustment Location:
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 86.5 MHz (64.0MHz)
CT3 109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2 86.5 MHz (64.0MHz)
CT2 109.5 MHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 520 kHz
CT4 1,750 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 600 kHz
CT1 1,400 kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1 455 kHz
CABINET (REAR) ASSY
Note: Follow the disassembly procedure in the numerical order given.
SECTION 2
DISASSEMBLY SECTION 3
ELECTRICAL ADJUSTMENTS
( ): East European model
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
speaker terminal
set
FM antenna terminal
4
Ω
0.01
µ
F
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
+
–
level mete
r
speaker terminal
set
4
Ω
CT3
L3
FM Frequency
Coverage
Adjustment
CT4
L4 AM Frequency
Coverage
Adjustment
FM Tracking
Adjustment
L2 CT2
FM
Antenna in
AM Tracking
Adjustment
L1 CT1
IC1
Speaker in
T2
T1
AM IF
Adjustment
[MAIN board] (Component Side)
POINTER SETTING
6
cabinet (rear) assy
8
lug, 3
2
two claws
1
claw
9
telescopic antenna
5
claw
!¡
INLET board
3
lid, battery cas
e
4
six screws
(BTP3
×
14)
!º
two screws
(P3
×
10)
7
screw
(P2.6
×
8)
5
Mount the pointer
3
two claws
3
claw
2
knob (TUNE)
1
Turn CV1 fully in
the arrow direction.
6
Insert the pointer to the knob (TUNE)
fitting the concave position of the pointer
to the convex position of the knob (TUNE).
4
chassis
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
T2
1
2
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9
20 19
18
17
16
15
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13
12
10
ANT1
J101
SP1 D3
– 9 – – 10 –
SECTION 5
EXPLODED VIEW
The components identified by
mark !or dotted line with mark
!are critical for safety.
Replace only with part number
specified.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
• Accessories and packing materials are given
in the last of the electrical parts list.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑↑
Parts Color Cabinet's Color
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
SECTION 6
ELECTRICAL PARTS LIST
Ref. No. Part No. Description Remark
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts speci-
fied in the diagrams or the components used
on the set.
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
• RESISTORS
All resistors are in ohms.
METAL: Metal-film resistor.
METAL OXIDE: Metal oxide-film resistor.
F: nonflammable
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when order-
ing these items.
• SEMICONDUCTORS
In each case, u: µ, for example:
uA. . : µA. . uPA. . : µPA. .
uPB. . : µPB. . uPC. . : µPC. .
uPD. . : µPD. .
• CAPACITORS
uF: µF
• COILS
uH: µH
Ref. No. Part No. Description Remark
The components identified by
mark !or dotted line with mark
!are critical for safety.
Replace only with part number
specified.
When indicating parts by reference
number, please include the board.
INLET MAIN
• Abbreviation
AR : Argentina
AUS : Australian
EE : East European
1 3-026-251-01 SCALE, DIAL
2 3-026-249-01 CABINET (FRONT)
3 3-908-109-11 POINTER
*4 3-908-107-02 CHASSIS
*5 1-670-706-11 INLET BOARD
6 7-685-647-79 SCREW +P 3X10 TYPE2 NON-SLIT
*7 3-908-115-01 TERMINAL (+), BATTERY
*8 3-908-116-01 SPRING (–), BATTERY COIL
9 7-685-134-19 SCREW +P 2.6X8 TYPE2 NON-SLIT
10 7-623-508-01 LUG, 3
11 3-029-028-01 TERMINAL (+/–), BATTERY
*12 3-908-130-01 HANDLE
13 7-685-549-11 SCREW +BTP 3X14 TYPE2 N-S
14 3-026-250-01 CABINET (REAR)
15 3-026-252-01 LID, BATTERY CASE
*16 A-3683-007-A MAIN BOARD COMPLETE (AEP, UK, AR, AUS)
*16 A-3683-008-A MAIN BOARD COMPLETE (EE)
17 3-908-111-01 KNOB (VOL)
18 3-908-110-01 KNOB (TUNE)
19 3-026-254-01 KNOB (POWER)
20 3-026-253-01 KNOB (BAND)
ANT1 1-501-222-81 ANTENNA, TELESCOPIC (FM)
D3 8-719-042-69 LED LN21RPL (TUNE)
J101 1-526-838-11 INLET, AC 2P
SP1 1-544-518-11 SPEAKER
!T2 1-450-324-21 TRANSFORMER, POWER
*1-670-706-11 INLET BOARD
***********
< AC INLET >
!J101 1-526-838-11 INLET, AC 2P (AC IN)
************************************************************
*A-3683-007-A MAIN BOARD, COMPLETE (AEP, UK, AR, AUS)
*A-3683-008-A MAIN BOARD, COMPLETE (EE)
*********************
*1-535-771-11 TERMINAL
< CAPACITOR >
C1 1-163-101-00 CERAMIC CHIP 22PF 5% 50V
C2 1-163-059-91 CERAMIC CHIP 0.01uF 10% 50V
C3 1-124-907-11 ELECT 10uF 20% 50V
C5 1-163-089-00 CERAMIC CHIP 6PF 50V (EE)
C5 1-163-101-00 CERAMIC CHIP 22PF 5% 50V
(AEP, UK, AR, AUS)
C6 1-163-097-00 CERAMIC CHIP 15PF 5% 50V (EE)
C6 1-163-104-00 CERAMIC CHIP 30PF 5% 50V
(AEP, UK, AR, AUS)
C7 1-102-936-00 CERAMIC 3.0PF 0.25PF 50V
C8 1-126-963-11 ELECT 4.7uF 20% 50V
C9 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C10 1-163-031-11 CERAMIC CHIP 0.01uF 50V
C11 1-126-963-11 ELECT 4.7uF 20% 50V
C12 1-124-907-11 ELECT 10uF 20% 50V
C13 1-163-038-00 CERAMIC CHIP 0.1uF 25V
C14 1-163-037-11 CERAMIC CHIP 0.022uF 10% 25V
C15 1-124-907-11 ELECT 10uF 20% 50V
C16 1-124-472-11 ELECT 470uF 20% 10V
C17 1-164-346-11 CERAMIC CHIP 1uF 16V
C18 1-164-346-11 CERAMIC CHIP 1uF 16V
C19 1-126-941-11 ELECT 470uF 20% 6.3V
C20 1-124-472-11 ELECT 470uF 20% 10V
C21 1-163-031-11 CERAMIC CHIP 0.01uF 50V
C22 1-163-031-11 CERAMIC CHIP 0.01uF 50V
C101 1-163-031-11 CERAMIC CHIP 0.01uF 50V (EE)
C102 1-163-031-11 CERAMIC CHIP 0.01uF 50V (EE)
< CERAMIC FILTER >
CF1 1-577-072-11 FILTER, CERAMIC
CF2 1-760-144-61 FILTER, CERAMIC
CF3 1-760-144-61 FILTER, CERAMIC
< VARIABLE CAPACITOR >
CT1-4 1-151-631-11 CAP, VARIABLE (AEP, UK, AR, AUS)
CT1-4 1-151-633-11 CAP, VARIABLE (EE)
CV1-4 1-151-631-11 CAP, VARIABLE (TUNE) (AEP, UK, AR, AUS)
CV1-4 1-151-633-11 CAP, VARIABLE (TUNE) (EE)
< DIODE >
D1 8-719-991-33 DIODE 1SS133T-77
D3 8-719-042-69 LED LN21RPL (TUNE)
D5 8-719-031-85 DIODE 1N4002L
D6 8-719-031-85 DIODE 1N4002L
< IC >
IC1 8-752-037-02 IC CXA1019S
< JACK >
J1 1-566-891-11 JACK (2)
< SHORT >
JR1 1-216-296-00 SHORT 0
< COIL >
L1 1-402-464-11 ANTENNA, FERRITE-ROD (MW)
L2 1-428-104-11 COIL, AIR-CORE (EE)
*L2 1-428-274-11 COIL, AIR-CORE (AEP, UK, AR, AUS)
L3 1-402-654-11 COIL, AIR-CORE (EE)
L3 1-428-222-11 COIL, AIR-CORE (AEP, UK, AR, AUS)
L4 1-406-028-00 COIL, OSC (MW)
< RESISTOR >
R1 1-216-049-11 RES,CHIP 1K 5% 1/10W
R2 1-216-045-00 METAL CHIP 680 5% 1/10W
R3 1-216-065-00 RES,CHIP 4.7K 5% 1/10W
R4 1-216-017-00 RES,CHIP 47 5% 1/10W
R5 1-216-017-00 RES,CHIP 47 5% 1/10W
• Abbreviation
AR : Argentina
AUS : Australian
EE : East European
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
– 11 –
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
MAIN
R7 1-216-057-00 RES,CHIP 2.2K 5% 1/10W
(EE)
R7 1-216-061-00 METAL CHIP 3.3K 5% 1/10W
(AEP, UK, AR, AUS)
R10 1-216-065-00 RES,CHIP 4.7K 5% 1/10W
R11 1-216-025-00 RES,CHIP 100 5% 1/10W
< VARIABLE RESISTOR >
RV1 1-225-441-11 RES, VAR, CARBON 50K (VOL)
< SWITCH >
S1 1-571-478-11 SWITCH, SLIDE (BAND)
S2 1-692-843-11 SWITCH, SLIDE (OPERATION)
< TRANSFORMER >
T1 1-404-790-11 TRANSFORMER, IF
!T2 1-450-324-21 TRANSFORMER, POWER
************************************************************
MISCELLANEOUS
**************
ANT1 1-501-222-81 ANTENNA, TELESCOPIC (FM)
SP1 1-544-518-11 SPEAKER
∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
ACCESSORIES & PACKING MATERIALS
********************************
!1-751-115-11 CORD, POWER (UK)
!1-769-412-11 CORD, POWER (AEP, EE, AUS)
3-862-928-11 MANUAL, INSTRUCTION
(ENGLISH, FRENCH, GERMAN, SPANISH)
3-862-928-21 MANUAL, INSTRUCTION
(DUTCH, POLISH, RUSSIAN)
The components identified by mark !or dotted
line with mark !are critical for safety.
Replace only with part number specified.
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
– 12 –
ICF-28
Sony Corporation
Personal A&V Products Company
9-924-934-12
98I0570087-1
Printed in Singapore © 1998. 9
Published by Quality Engineering Dept.
(Shibaura)
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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