ICF-C255RC (serv.man2) - Sony Audio Service Manual (repair manual). Page 7

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SECTION  3
ELECTRICAL  ADJUSTMENTS

[FM]
Setting:
BAND switch: FM

[MW/LW]
Setting:
BAND switch: MW/LW
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 MHz
AM  IF  ADJUSTMENT
Adjust for a VT VOLTAGE 2.65 ± 0.1V on volt meter.
T1
5450 kHz
MW FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a VT VOLTAGE 2.25 ± 0.05V on volt meter.
  L1
  531 kHz
MW  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L4-1
CT1
621 kHz
1,404 kHz
LW FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
CT4
153 kHz
LW  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L4-2
CT2
162 kHz
243 kHz

• Adjusting Location: MAIN board (Component Side)
— 7 —
— 8 —
T1 AM IF adjustment
FM TRACKING adjustment
L1 MW FREQUENCY COVERAGE 
adjustment
CT1  MW TARCKING adjustment
CT3
L3
L4-2  LW TRACKING adjustment
L4-1  MW TRACKING adjustment
CT2  LW TARCKING adjustment
CT4  LW FREQUENCY COVERAGE 
adjustment
2-6.   POWER CORD AND ANTENNA CORD SETTING
Power board
Main board
Set the power cord and the antenna cord
as illustrated below,
then install the cabinet (lower).
Power cord
Power cord
Antenna cord
Antenna cord
Cabinet (lower)
+
–
FM RF signal generator
 22.5 kHz frequency
deviation by 400 Hz
signal
FM lead wire antenna terminal
speaker terminal
0.01 
µF
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

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