Sony Dream Machine ICF-C290, Руководство по обслуживанию

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( ): 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 600 kHz
CT1 1,400 kHz
LW FREQUENCY COVERAGE ADJUSTMENT (C290L)
Adjust for a maximum reading on level meter.
L4 145 kHz
CT6 265 kHz
LW TRACKING ADJUSTMENT (C290L)
Adjust for a maximum reading on level meter.
L1 160 kHz
CT5 240 kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1 455 kHz
– 5 – – 6 –
SECTION 3
ELECTRICAL ADJUSTMENTS
FM SECTION
Setting:
BAND switch: FM
AM SECTION
Setting:
BAND switch: AM/LW
• Repeat the procedures in each adjustment several times, and
the frequency coverage and tracking adjustments should be fi-
nally done by the trimmer capacitors.
Adjustment Location: MAIN board (Conductor Side)
FM RF signal
generator
400 Hz, 30% FM modulation
frequency deviation
±
22.5 kHz
Output level: as low as possible
0.01
µ
F
set
lead antenna
input terminal
AM RF signal
generator
400 Hz, 30%
AM modulation
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
level meter
set
speaker terminal
8
Ω
+
–
IC1
CT6
LW FREQUENCY
COVERAGE AM FREQUENCY
COVERAGE
FM TRACKING
AM TRACKING
LW TRACKING
AM IF
FM FREQUENCY
COVERAGE
L4
L3
L3
CV1
CT2
CT5
L1
T1
CT1
CT4
CT3