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CFD-50
|
5-2.
TUNER
SECTION
[AM]
FUNCTION switch: AM
AM RF SSG
Put the lead-wire
antenna close to
we
the set.
(QE
aE
30% amplitude modulation
by 400 Hz signal
output level: as low as possible
[FM]
FUNCTION switch: FM
FM RF SSG
22.5 kHz frequency deviation
'by 400 Hz signal
output level: as low as possible
to FM ANT IN
PHONES
@
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
AM
IF ADJUSTMENT
Adjust for a maximum reading on VITVM.
455 kHz
AM FREQUENCY
COVERAGE
ADJUSTMENT
Adjust for a maximum reading on
VT VM.
520 kHz
1,780 kHz
AM TRACKING
ADJUSTMENT
Adjust for a maximum reading on VTVM.
600 kHz
1,500 kHz
FM TRACKING
ADJUSTMENT
Adjust for a maximum reading on VTVM.
.
86.5 MHz
109.5 MHz
FM VCO Adjustment
A)
Regular Method
Procedure:
FM
ff signal
generator
=
po
Carrier
frequency : 98MHz
telescopic
Modulation:
no
modulation
antenna
lead
Output
level: 0.1V
(100dB)
Remove jumper wire as shown below.
Connect frequency counter to the positions shown below.
Tune the set to 98 MHz.
Adjust RV1 for 76 kHz + 500 Hz reading on the frequency counter.
After adjustment, connect jumper wire removed in step 1.
Remove jumper wire
Aaa
Noe
frequency counter
nee)
Bere
B)
Simple Method
Procedure:
1.
Tune the set to the FM stereo broadcasting signal.
2.
Turn RV1 clockwise or counterclockwise and memorize the lighting-
up range of the FM STEREO lamp.
3.
Secure RVI at the center of the lighting-up range of both turns as
shown below.
center
of lighting-up
ranges
lighting-up
range
iO)
/
,
N
RVI
FM FREQUENCY
EMVvco
COVERAGE
RV1
L2 cCT2
AM
TRACKING
11
CTi
Li
CT4
L4
AMIE
CEM
FREQUENCY
—38—
TRACKING
GovERAGE
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