ICF-18 - Sony Audio Service Manual (repair manual). Page 4

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– 6 –

Mark

Center frequency

red

10.70 MHz

blue

10.67 MHz

orange

10.73 MHz

black

10.64 MHz

white

10.76 MHz

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.

1

2

3

4

5

6

7

8

9

10

15

14

13

12

11

FM

DISCRIMINATOR

AF POWER AMP

AM FE

FM IF

TUNING

METER

AM IF DET AGC

FM FE

23

22

21

20

24

25

19

18 17 16

29 28 27 26

30

GND

GND

AF OUT

VCC

RIPPLE

FIL

TER

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

•

All capacitors are in 

µ

F unless otherwise noted.  pF: 

µµ

F 50

WV or less are not indicated except for electrolytics and
tantalums.

•

All resistors are in 

Ω

  and 

1

/

4

 

W 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 M

Ω

).

Voltage variations may be noted due to normal production
tolerances.

•

Signal path.

: FM

•

: parts extracted from the component side.

•

p

: parts mounted on the conductor side.

•

¢

: internal component.

•

: Pattern from the side which enables seeing.