Sony ICF-8 Service manual

Page 1

ICF-18

SERVICE MANUAL

SPECIFICATIONS

US Model

Canadian Model

AEP Model

UK Model

E Model

Austr alian Model

SECTION 1

GENERAL

This section is extracted from instruction manual.

MICROFILM

FM/AM RADIO

Page 2

SECTION 2

DISASSEMBLY

Note: Follow the disassembly procedure in the numerical order given.

CABINET (REAR)

5

screw

(P 3

×

10)

3

three claws

1

Remove the battery case lid

to direction of the arrow.

2

two screws

×

14)

(P 3

KNOB (VOL), KNOB (TUNE)

knob (tune)

screw driver

1

two claws

6

lug

4

cabinet (rear)

knob (vol)

screw driver

2

knob (tune)

– 2 –

2

knob (vol)

1

two claws

Page 3

SECTION 3

g

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

r

DIAL POINTER SETTING

SECTION 4

ELECTRICAL ADJUSTMENTS

Note: Follow the assembly procedure in the numerical order given.

Note: When take off the pointer,

remove to direction of the arrow

pointer

A

A

.

2

Turn the VC gear

fully in the arrow direction.

B

B

3

Insert the pointer to the gear

fitting the concave position of the pointer to the convex position of the

ear.

1

Slide the pointer

to the inner part.

0dB=1 µV

[FM Section]

Setting:

Band select switch: FM

[AM Section]

Setting:

Band select switch: AM

Put the lead-wire

AM RF SSG

30% amplitude modulation by 400 Hz signal Output level: as low as possible

antenna close to the set.

set

8

Ω

earphone jack

level mete

+ –

Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.

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

TRACKING

L1

JW4

CT4

T1

AM IF

L2 CT2

FM TRACKING

FM antenna terminal

AM FREQUENCY

COVERAGE

CT3 L4

IC1

BAND SELECT

(

SWITCH

FM

↔AM↔

S1

CT1

FM FREQUENCY

L3

COVERAGE

)

OFF

– 3 –

– 4 –

Page 4

2

ICF-18

SECTION 5

DIAGRAMS

5-1. SCHEMATIC DIAGRAM

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

• All resistors are in Ω and 1/ specified.

W or less unless otherwise

4

• ¢ : 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). V oltage variations may be noted due to normal production tolerances.

• Signal path.

: FM

• IC Block Diagram

IC1 CXA1019S

GND

GND

AF OUT

VCC

RIPPLE

FILTER

AF IN

DET OUT

AFC AGC

AFC AGC

FM FE

FM OSC

REG OUT

IF GND

TUNING

FM RF

23 22 21 202425 19 18 17 1629 28 27 2630

AM IF DET AGC

AF POWER AMP AM FE FM IF

FM

DISCRIMINATOR

2 345 6 7 8 9 10 1514131211

1

GND

GND

NF

FM DISCRI

VOL

AFC

AM OSC

METER

METER

AM RF IN

N.C

N.C

FM IF IN

FE GND

FM RF IN

AM IF IN

FM/AM BAND

SELECT

IF OUT

FM/AM

5-2. PRINTED WIRING BOARDS

HOW TO CHANGE THE CERAMIC FILTERS

This model is used two ceramic filters of CF2, CF3. Y ou must use same type of color marked cer amic 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.

Mark Center frequency

CF

mark

CF3

red 10.70 MHz

blue 10.67 MHz

orange 10.73 MHz

black 10.64 MHz

white 10.76 MHz

– 5 –

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.

– 6 –

Page 5

SECTION 6

EXPLODED VIEW

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

5

SP1

• 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 number 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.

ANT1

6

#3

not supplied

#1

#2

7

12

not supplied

8

9

2

3

4

11

1

10

Ref. No. Part No. Description Remark

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

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)

– 7 –

Page 6

MAIN

SECTION 7

ELECTRICAL PARTS LIST

NOTE:

• Due to standardization, replacements in the parts list may be different from the parts specified 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

Ref. No. Part No. Description Remark

* A-3662-892-A MAIN BOARD, COMPLETE (US) * A-3679-659-A MAIN BOARD, COMPLETE

(Canadian, AEP, UK, E, AUS)

*********************

< CAP ACIT OR >

C 1 1-102-945-00 CERAMIC 8.0PF ±0.5PF 50V C 2 1-101-004-00 CERAMIC 0.01uF 50 V C 3 1-124-907-11 ELECT 10uF 20% 5 0V C 5 1-102-953-00 CERAMIC 18PF 5% 50 V C 6 1-102-961-00 CERAMIC 27PF 5% 50 V

• Items marked “*” are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering 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

When indicating parts by reference number, please include the board.

Ref. No. Part No. Description Remark

< JACK >

J1 1-770-666-11 JACK ( @)

< COIL >

L 1 1-501-770-11 ANTENNA, FERRITE-ROD (AM) L 2 1-406-546-11 COIL, AIR-CORE (FM RF)

* L3 1-428-306-11 COIL, AIR-CORE (FM OSC)

L 4 1-406-028-00 COIL, OSC (AM OSC)

< RESISTOR >

C 7 1-102-944-00 CERAMIC 7.0PF ±0.5PF 50V C 8 1-101-004-00 CERAMIC 0.01uF 50 V C 9 1-126-963-11 ELECT 4.7uF 20% 50 V C1 0 1-101-004-00 CERAMIC 0.01uF 50 V C1 1 1-124-907-11 ELECT 10uF 20% 50V

C1 2 1-126-963-11 ELECT 4.7uF 20% 50 V C1 4 1-162-843-11 CERAMIC 0.022uF 10% 16V C1 5 1-124-903-11 ELECT 1uF 20% 50V C1 6 1-124-907-11 ELECT 10uF 20% 50V C1 7 1-126-941-11 ELECT 470uF 20% 6.3V

C1 8 1-162-851-11 CERAMIC 0.1uF 10% 16 V C1 9 1-126-941-11 ELECT 470uF 20% 6.3V C2 0 1-101-880-00 CERAMIC 47PF 5% 50V

< CERAMIC FIL TER >

C F1 1-577-072-11 FILTER, CERAMIC C F2 1-760-144-61 FILTER, CERAMIC C F3 1-760-144-61 FILTER, CERAMIC

< VARIABLE CAP ACIT OR >

C V 1 1-141-529-11 CA P, VA R (TUNING) CT1-4 1-141-529-11 CAP, VA R

< DIODE >

D 1 8-719-911-19 DIODE 1SS119

< IC >

IC 1 8-752-055-05 IC CXA1019S

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)

< VARIABLE RESIST OR >

R V1 1-228-790-00 RE S, V AR, CARBON 50K (V OLUME)

< SWITCH >

S1 1-762-356-11 SWITCH, SLIDE (FM/AM/OFF)

< TRANSFORMER >

T 1 1-404-790-11 TRANSFORMER, IF (AM IF)

************************************************************

MISCELLANEOUS

***************

* 12 1-656-281-11 POSITIVE TERMINAL BOARD

ANT1 1-501-774-11 ANTENNA, TELESCOPIC (FM) SP1 1-504-861-11 SPEAKER (9.2CM)

************************************************************

**************

HARD WARE LIST

**************

#1 7-623-508-01 LUG, 3 #2 7-685-647-79 SCREW +P 3X10 TYPE2 NON-SLIT #3 7-685-649-79 SCREW +P 3X14 TYPE2 NON-SLIT

************************************************************

– 8 –

Page 7

Ref. No. Part No. Description Remark

ACCESSORIES & P ACKING MA TERIALS

********************************

3-860-966-11 MANUAL, INSTRUCTION (ENGLISH, FRENCH,

GERMAN , SPANISH, SWEDISH, PORTUGUESE,

3-860-966-21 MANUAL, INSTRUCTION (ENGLISH) (US) 3-923-510-01 BELT (SHOULDER) 3-925-458-01 STOPPER, BEL T

ARABIC, RUSSIAN) (EXCEPT US)

– 9 –

Page 8

ICF-18

Sony Corporation

Personal & Mobile Communication Company9-925-741-11

– 10 –

Published by Quality Assurance Dept.

Printed in Japan © 1997. 9

97I0594-1

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