Section 3 Electrical Adjustments - Sony ICF-C290 Service Manual

ELECTRICAL ADJUSTMENTS
FM SECTION
Setting:
BAND switch: FM
FM RF signal
generator
lead antenna
input terminal
0.01 µ F
set
400 Hz, 30% FM modulation
frequency deviation ± 22.5 kHz
Output level: as low as possible
AM SECTION
Setting:
BAND switch: AM/LW
AM RF signal
generator
Put the lead-wire
antenna close to
the set.
400 Hz, 30%
AM modulation
Output level: as low as possible
level meter
8 Ω
+
set
–
speaker terminal
• Repeat the procedures in each adjustment several times, and
the frequency coverage and tracking adjustments should be fi-
nally done by the trimmer capacitors.
SECTION 3
( ): Italian model
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 86.5 MHz (87.35 MHz)
CT3 109.5 MHz (108.25 MHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
CT2 109.5 MHz (108.25 MHz)
AM FREQUENCY COVERAGE ADJUSTMENT (C290)
Adjust for a maximum reading on level meter.
L4 520 kHz (516.5 kHZ)
CT4 1,650 kHz (1,631.5 kHz)
AM TRACKING ADJUSTMENT (C290)
Adjust for a maximum reading on level meter.
L1
CT1 1,400 kHz
LW FREQUENCY COVERAGE ADJUSTMENT (C290L)
Adjust for a maximum reading on level meter.
L4
CT6
LW TRACKING ADJUSTMENT (C290L)
Adjust for a maximum reading on level meter.
L1
CT5
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
– 5 –
Adjustment Location: MAIN board (Conductor Side)
600 kHz
145 kHz
265 kHz
160 kHz
240 kHz
455 kHz
FM FREQUENCY
COVERAGE
LW TRACKING
AM IF
L1
CT5
T1
L3
CV1
IC1
CT2
CT1
L3
L4
CT6
CT3
CT4
AM TRACKING
FM TRACKING
LW FREQUENCY AM FREQUENCY
COVERAGE COVERAGE
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