Page 237
B.Vi~hu
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o:~
LP
SFN~;
COIL
ROTATE SLUG FOR
PEAK
VOLTAGE.
1
FivN
BAND
7
5,
'
-.
,.
.
SWITCH
6
try<
.
.
NUMBER THEN ROTATE SLUG AS DESCRIBED.
.
.
-.c,,<
7
VOLT
j
4
cw
FFsn,,-,
,
:YYaL'7
-
L401 112 turn
CW*
.rrr.
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.ira
-
(z377.33
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~-
1 turn
CCWM*
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.
1
jq
oe'PY
-
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14.0
'
2
1
1'3
.
L403
I/z
1
turn CW
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22
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-
In
4
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b
21.0
:
2
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-
.-
39
1 turn
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CW-
13
z
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28.0
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7
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CW-
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12s
36
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.
.
-
28.5-
2
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L407 1 turn CW
17q
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-
-
.
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373qe1*6
.
29.0
j
2
2't
L408
1
turn
cw
-
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29.5
2
\
~'q
i
1409
I/L
1
turn CW
I
i
*clockwise
..
counterclockwise
I
POSSIBLE CAUSE CHART
I
1.
HFO will not oscillate on one or more bands (meter
remains at
0).
A. BAN0 switch.
6.
Chassis wiring.
C.
Refer to the HFOIpremix circuit board in the
maintenance section.
(1)
Release the ON button.
(4
Disconnect the voltmeter and remove board
D
from
the extender board.
VFO FREQUENCY, SHIFT AND
LEVEL ADJUSTMENT
NOTES:
1.
In the following step, if the alignment tool will not
engage the coil slug.
toosen the four VFO mounting
screws on the bottom of the chassis and move the
VFO forward. After the adjustment
is
completed,
I
reposition the VFO and tighten the mounting screws.
2.
The object of this adjustment
is
to center the 500 kHz
of the 3.5 band within the total VFO tuning range.
(
)
Turn the BAND switch to 3.5.
I
/
!
(,
)
Remove the extender board.
,
)
Depress the ON button.
(
)
Turn the MAlN TUNING knob until the display will
( )
Replace the extender board pln assembly removed
go no lower. If the display
is
then unstable (except the
earl~er.
right digit), repeat the VFO Output adjustment.
(,.
)
Plug board D into compartment D.
VFO OUTPUT ADJUSTMENT
(
)
Depress the ON button.
,
I
Turn the BAND switch to
W.
,
.
I
Refer to Figure 1-3 (fold-out from Page 237) and
engage the VFO adjustment control through hole FY
in the side of the VFO assembly. Turn the control
clockwise until the display becomes unstable. Then
turn the control back until the display
is
stable.
(1)
Turn the BAND switch to 29.5 and check for display
stability
(+
or
-
one count). If the display
is
unstable.
turn the control counterclockwise until the display is
stable at both the 29.5 and
WWV positions of the
band switch.
(
Remove the MAIN TUNING knob.
,
)
Insert the coil alignment
twl
into hole ET in the panel
and into the corresponding hole in the VFO enclosure.
Fit the tool into the coil slug. Adjust the slug until the
display reads approximately 3475.0. You may be able
to see this display at two positions of the coil slug.
When you have the correct position, the display will
read lower with counterclockwise rotation of the
alignment tool.
(,
)
Reinstall the MAlN TUNING knob.
(
)
Turn the MAIN TUNING knob until the frequency
displayed
is
approximately 3800. Then temporarily
remove the large knob.
( )
Depress the USB bunon and write down the
frequency displayed.
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