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Test Oscillator
Loop Antenna
Loop Antenna
40 - 60cm
Set
PRELIMINARIES
1
saturating and to obtain peak value.
Set the VTVM to the 3V, AC range.
Modulate the test oscillator at 1KHz and set the degree
of-modulation to approximately 30% if the modulation
degree is variable.
AM IF ADJUSTMENT (455KHz Adjustment)
1
2
Set the test oscillator to 455KHz.
Adjust the cores of IFT, RT04 and RTO5 for maximum
times.)
AM FREQUENCY
RANGE ADJUSTMENT
(Adjustment to cover 505KHz - 1650KHz)
1
2
3
L
Set the test oscillator to 505KHz.
Turn the Radio Tuning Knob to the lower frequency.
(Tuning Capacitor plates fully meshed).
Adjust
the core
of RT03
for maximum
oscilloscope
waveform and VTVM
indication.
Set the test oscillator to 1650KHz.
Turn the Radio Tuning Knob to the highest frequency.
(Tuning Capacitor plates fully open).
-
AM TRACKING
+>
gh ieee
RLO4
VTVM or Tester
Oscilloscope
* Connect this to Point SX in the TV PCB.
AM TRACKING ADJUSTMENT
1
NO
AM
BAR ANTENNA
—10—
* After adjustment, fasten the coil with paraffin.
Set the test oscillator and the Radio Dial to 1400KHz.
Adjust
the trimmer
capacitor
(VCT-A)
of the tuning
capacitor
for
maximum
oscilloscope
waveform
and
VTVM
indication.
Repeat
the
AM
frequency
range
and
AM
tracking
adjustments two or three times.
RADIO CHASSIS TOP VIEW
FM DET
RTO2
VCTIFCI)
id
he
P=
7 Pin
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