Read Sony ICF-C490 / ICF-CD863 / ICF-CD863L Service Manual online
6
ICF-C490
0 dB = 1
µ
V
[AM]
Setting:
BAND switch: AM
BAND switch: AM
[FM]
Setting:
BAND switch: FM
BAND 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.
done by the trimmer capacitors.
• Remove FM antenna in FM adjustments.
Adjustment Location: MAIN board (See page 7)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
MAIN board
TP (SP –)
TP (SP –)
MAIN board
TP (SP +)
TP (SP +)
set
MAIN board
TP (FM ANT)
TP (FM ANT)
8
Ω
0.01
µ
F
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
455 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
515 kHz
CT1-4
1,750 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
600 kHz
CT1-1
1,400 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L3
86.5 MHz
CT1-3
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L-2
86.5 MHz
CT1-2
109.5 MHz
SECTION 3
ELECTRICAL ADJUSTMENTS
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
8
Ω
MAIN board
TP (SP –)
TP (SP –)
MAIN board
TP (SP +)
TP (SP +)
Click on the first or last page to see other ICF-C490 / ICF-CD863 / ICF-CD863L service manuals if exist.