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SECTION
5. MAINTENANCE
AND
ALIGNMENT
:
Hi
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5.1
ALIGNMENT
The VFO-820
is carefully aligned and tested before it leaves the factory and
should require no further adjustment.
In fact, the VFO circuit is quite delicate
RELAY
VRI1
and should not be serviced without
sophisticated test equipment.
VFO UNIT
3)
5.2
REMOVING THE COVER
Remove the one top screw and the six side screws and pull the top cover off.
All circuits can
be reached
for servicing
by removing
the top cover.
The
bottom
is a sealed chassis and can not be removed.
5.3.
RIT ZERO
Push the RIT switch to ON
and turn the RIT control to the zero marking.
Receive a 25 kHz marker signal from the TS-820 and tune for about
a 1000
Hz tone.
Push the RIT switch off. If the RIT circuit is correctly adjusted, the
tone
will be the same
frequency
with
RIT on
and
off.
Figure
5 shows
adjustment of the RIT circuit.
If necessary,
adjust VR1
until the frequency
does not vary.
Fig. 5 RIT Adjustment
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