ICF-C253 - Sony Audio Service Manual (repair manual). Page 5

Setting:
BAND switch: FM

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.

FM  TRACKING  ADJUSTMENT

Adjust for a maximum reading on level meter.

L3

CT3

87.5 MHz

108 Hz

AM FREQUENCY  COVERAGE  ADJUSTMENT

Adjust for a maximum reading on level meter.

  L1

  531 kHz

AM  TRACKING  ADJUSTMENT

Adjust for a maximum reading on level meter.

L4

CT1

621 kHz

1,404 kHz

AM  IF  ADJUSTMENT

Adjust for a maximum reading on level meter.

T1

450 kHz

• Adjusting Location: MAIN board (Component Side)

+
–

FM RF signal generator

 22.5 kHz frequency
deviation by 400 Hz
signal

FM lead wire antenna terminal

speaker terminal

0.01 

µ

F

set

level meter

+
–

AM RF SSG

Put the lead-wire
antenna close to
the set.

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

set

speaker terminal

level meter

7

Power board

2

Terminal

4

Power cord

3

Remove the

two solderings.

5

Remove the

six solderings.

6

Transformer

power

1

— 5 —

— 6 —

T1 AM IF adjustment

FM TRACKING adjustment

L1 AM FREQUENCY COVERAGE 
adjustment

AM TARCKING adjustment

CT3
L3

CT1
L4

FM antenna

Power board

Set the power cord as illustrated below,
then install the lower cabinet.

power cord

lower cabinet