b)
Adjustment
(1)
Adjust
the
GND
level
of
the oscilloscope.
(2)
Set the switch
to
all
OFF, connect
the
oscilloscope
to
point A and manipulate
the
potentiometer on the
special tool
to
adjust it
to
2.4
V.
The oscilloscope
voltage range
at
this point should
be
set
to
TV/scale
notch with the frequency range
at
any point.
(3)
Connect the oscilloscope
to
point B and change
the
oscilloscope frequency range
to
0.05 microsecond.
Next, manipulate the trimmer capacitor on
the
PWB
to
make the oscillation frequency synchronized
to
247"" 252 nanoseconds.
(4)
Set
the
switch
to
"1",
connect
the
oscilloscope
to
point C and the oscilloscope frequency range
to
0.1
microsecond and make it triggered
at
the
rising
edge
of the signal. Manipulate
the
VR1
on
the
PWB
to
adjust the
2-V
waveform
to
2-V
waveform
to
2-V
waveform distance
to
495""
505
nanosecond.
2.0V
(5)
Set
the
switch
to
"2"
and
the
frequency range
to
0.2 microsecond and manipulate the VR2
to
set
the
2-V
waveform
to
2-V
waveform distance
to
990""
1010 nanosecond.
(6)
Set the switch
to
"3"
and
the
frequency rance
to
0.5 microsecond and manipulate
the
VR3
to
set the
2-V
waveform
to
2-V
waveform distance
to
2.48""
2.52 microseconds.
(7) Set
the
switch
to
"4"
and the frequency range
to
1
microsecond and manipulate
the
VR6
to
set the
2-V
waveform
to
2-V
waveform distance
to
4.95""
5.05
microseconds.
With
the above procedure,
the
VFO adjustment
is
com-
plate. Set straps
as
shown
in
Table
1-B
and make poten-
tiometers locked with paint.
(See
the succeeding table for strap locations)
~
8 inch
JRS
MFM
During
VFO
adjustment
OFF ON
Tside
...
ON
R side
..•
OFF
During operation
ON OFF
Tside
.•.
OFF
R
side
•••
ON
OFF
ON
Cl
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