Sony ICF-18 User manual

FM/AM RADIO
MICROFILM
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
SPECIFICATIONS
SERVICE MANUAL
ICF-18
SECTION 1
GENERAL
This section is extracted from
instruction manual.

– 2 –
Note: Follow the disassembly procedure in the numerical order given.
CABINET (REAR)
SECTION 2
DISASSEMBLY
KNOB (VOL), KNOB (TUNE)
1 Remove the battery case lid
to direction of the arrow.
2 two screws
(P 3
× 14)
4 cabinet (rear)
6 lug
5 screw
(P 3
× 10)
3 three claws
1 two claws
1 two claws
2 knob (tune)
2 knob (vol)
knob (tune)
screw
driver
knob (vol)
screw
driver

– 3 – – 4 –
Note: Follow the assembly procedure in the numerical order given.
SECTION 3
DIAL POINTER SETTING
1 Slide the pointer
to the inner part.
2 Turn the VC gear
fully in the arrow
B
direction.
3 Insert the pointer to the gear
fitting the concave position
of the pointer to the convex
position of the
g
ear.
pointer
A
Note: When take off the pointer,
remove to direction of the arrow
A .
B
SECTION 4
ELECTRICAL ADJUSTMENTS
[AM Section]
Setting:
Band select switch: AM
0dB=1 µV
[FM Section]
Setting:
Band select switch: FM
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
FM RF SSG
± 22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
earphone jack
set
FM antenna terminal
8 Ω
AM RF SSG
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
earphone jack
set
8 Ω
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 75.0 MHz
CT1 109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2 75.0 MHz
CT2 109.5 MHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 520 kHz
CT3 1,650 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 600 kHz
CT4 1,400 kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1 455 kHz
Adjustment Location: MAIN board (Component Side)
AM FREQUENCY
COVERAGE
CT3 L4
CT1
L3
FM FREQUENCY
COVERAGE
FM
antenna
terminal
L1
CT4
AM
TRACKING
T1
AM IF
L2 CT2
FM TRACKING
IC1
S1
(
BAND SELECT
)
SWITCH
FM
↔ AM ↔ OFF
JW4

CF
2
CF3
mark
– 5 – – 6 –
ICF-18 SECTION 5
DIAGRAMS
5-1. SCHEMATIC DIAGRAM
5-2. PRINTED WIRING BOARDS
Mark Center frequency
red 10.70 MHz
blue 10.67 MHz
orange 10.73 MHz
black 10.64 MHz
white 10.76 MHz
HOW TO CHANGETHE CERAMIC FILTERS
This model is used two ceramic filters of CF2, CF3.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must change two pieces together since
it's supply two pieces in one package as a spare parts.
• IC Block Diagram
IC1 CXA1019S
12 3 45 6 7 8 9 10 1514131211
FM
DISCRIMINATOR
AF POWER AMP AM FE FM IF
TUNING
METER
AM IF DET AGC
FM FE
23 22 21 202425 19 18 17 1629 28 27 2630
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
FM/AM
IF OUT
N.C
FE GND
AM RF IN
FM RF
REG OUT
FM OSC
FM RF IN
AFC
AM OSC
VOL
NF
FM DISCRI
GND GND
Note on Schematic Diagram:
•Allcapacitorsarein µFunless otherwisenoted. pF: µµF50
WV or less are not indicated except for electrolytics and
tantalums.
•All resistors are in Ωand 1/4W or less unless otherwise
specified.
•¢: internal component.
•: panel designation.
•: B+ Line.
•: adjustment for repair.
•Power voltage is dc 3 V and fed with regulated dc power
supply from battery terminal.
•Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
( ) : AM
[ ] : FM/AM
•Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
•Signal path.
: FM
Note on Printed Wiring Board:
•:parts extracted from the component side.
•p:parts mounted on the conductor side.
•¢:internal component.
•:Pattern from the side which enables seeing.

– 7 –
SECTION 6
EXPLODED VIEW
• 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.
• Hardware (# mark) list and 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
*9 A-3662-892-A MAIN BOARD, COMPLETE (US)
*9 A-3679-659-A MAIN BOARD, COMPLETE (EXCEPT US)
10 3-920-188-01 GEAR, VC
11 3-925-513-01 SHEET (BAND)
*12 1-656-281-11 POSITIVE TERMINAL BOARD
ANT1 1-501-774-11 ANTENNA, TELESCOPIC (FM)
SP1 1-504-861-11 SPEAKER (9.2CM)
1 3-017-750-01 PLATE, TRANSPARENT
2 3-017-752-01 KNOB (TUNE)
3 3-017-753-01 KNOB (VOL)
4 3-017-749-01 CABINET (FRONT)
5 3-920-194-01 TERMINAL (–), BATTERY
6 3-017-751-01 POINTER
7 3-920-185-01 CABINET (REAR)
8 3-905-428-11 LID, BATTERY CASE
#1
#2
#3
1
234
5
SP1
6
not supplied
ANT1
7
8
not supplied
11
9
10
12

– 8 –
SECTION 7
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
mayhavesome differencefromtheoriginalone.
• 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
When indicating parts by reference
number, please include the board.
*A-3662-892-A MAINBOARD,COMPLETE(US)
*A-3679-659-A MAINBOARD,COMPLETE
(Canadian, AEP,UK, E, AUS)
*********************
<CAP ACIT OR>
C1 1-102-945-00 CERAMIC 8.0PF ±0.5PF 50V
C2 1-101-004-00 CERAMIC 0.01uF 50V
C3 1-124-907-11 ELECT 10uF 20% 50V
C5 1-102-953-00 CERAMIC 18PF 5% 50V
C6 1-102-961-00 CERAMIC 27PF 5% 50V
C7 1-102-944-00 CERAMIC 7.0PF ±0.5PF 50V
C8 1-101-004-00 CERAMIC 0.01uF 50V
C9 1-126-963-11 ELECT 4.7uF 20% 50V
C10 1-101-004-00 CERAMIC 0.01uF 50V
C11 1-124-907-11 ELECT 10uF 20% 50V
C12 1-126-963-11 ELECT 4.7uF 20% 50V
C14 1-162-843-11 CERAMIC 0.022uF 10% 16V
C15 1-124-903-11 ELECT 1uF 20% 50V
C16 1-124-907-11 ELECT 10uF 20% 50V
C17 1-126-941-11 ELECT 470uF 20% 6.3V
C18 1-162-851-11 CERAMIC 0.1uF 10% 16V
C19 1-126-941-11 ELECT 470uF 20% 6.3V
C20 1-101-880-00 CERAMIC 47PF 5% 50V
<CERAMICFIL TER>
CF1 1-577-072-11 FILTER, CERAMIC
CF2 1-760-144-61 FILTER, CERAMIC
CF3 1-760-144-61 FILTER, CERAMIC
<VARIABLECAP ACIT OR>
CV1 1-141-529-11 CAP,VAR(TUNING)
CT1-4 1-141-529-11 CAP,VAR
<DIODE>
D1 8-719-911-19 DIODE 1SS119
<IC>
IC1 8-752-055-05 IC CXA1019S
<JACK>
J1 1-770-666-11 JACK( @)
<COIL>
L1 1-501-770-11 ANTENNA,FERRITE-ROD(AM)
L2 1-406-546-11 COIL,AIR-CORE(FMRF)
*L3 1-428-306-11 COIL,AIR-CORE(FMOSC)
L4 1-406-028-00 COIL,OSC(AMOSC)
<RESISTOR>
R1 1-249-422-11 CARBON 2.7K 5% 1/4W
R5 1-249-397-11 CARBON 22 5% 1/4W
R6 1-249-421-11 CARBON 2.2K 5% 1/4W
R7 1-249-433-11 CARBON 22K 5% 1/4W
R8 1-249-427-11 CARBON 6.8K 5% 1/4W (US)
<VARIABLERESIST OR>
RV1 1-228-790-00 RES,VAR, CARBON50K(V OLUME)
<SWITCH>
S1 1-762-356-11 SWITCH,SLIDE(FM/AM/OFF)
<TRANSFORMER>
T1 1-404-790-11 TRANSFORMER,IF(AMIF)
************************************************************
MISCELLANEOUS
***************
*12 1-656-281-11 POSITIVETERMINALBOARD
ANT1 1-501-774-11 ANTENNA,TELESCOPIC(FM)
SP1 1-504-861-11 SPEAKER(9.2CM)
************************************************************
**************
HARD WARELIST
**************
#1 7-623-508-01 LUG,3
#2 7-685-647-79 SCREW+P3X10TYPE2NON-SLIT
#3 7-685-649-79 SCREW+P3X14TYPE2NON-SLIT
************************************************************
MAIN

– 9 –
Ref. No. Part No. Description Remark
ACCESSORIES&P ACKINGMA TERIALS
********************************
3-860-966-11 MANUAL,INSTRUCTION(ENGLISH,FRENCH,
GERMAN ,SPANISH, SWEDISH, PORTUGUESE,
ARABIC,RUSSIAN)(EXCEPTUS)
3-860-966-21 MANUAL,INSTRUCTION(ENGLISH)(US)
3-923-510-01 BELT(SHOULDER)
3-925-458-01 STOPPER, BEL T

– 10 –
Sony Corporation
Personal & Mobile Communication Company9-925-741-11
ICF-18
97I0594-1
Printed in Japan © 1997. 9
Published by Quality Assurance Dept.