TM 11-6625-1668-12
2-9. Installation of Fuses and Crystals
a. All fuses are installed at the factory. The fuses in each major component, their value, and reference
designation are listed below. Figures 2-4, 2-5 and 2-6 will aid in locating most fuses. Other fuses are located
on the plug-in assemblies (check reference designation for assembly number).
Major Component
Reference Designation
Value
Function
Generator .....................................
1A2A12F1 ...................................
1 AMP SLO-BLO .........................
AC line.
1A2A12F2 ...................................
1 AMP SLO-BLO .........................
AC line.
1A2A12F3 ...................................
3 AMP..........................................
+6 volts.
1A2A12F4 ...................................
1/2 AMP.......................................
-6 volts.
1A2A2F1 .....................................
1/4 AMP.......................................
Positive keyer.
1A2A2F2 .....................................
1/4 AMP.......................................
Negative keyer.
Analyzer........................................
2A2A9F1 .....................................
1 AMP SLO-BLO .........................
AC line.
2A2A9F2 .....................................
1 AMP SLO-BLO .........................
AC line.
6 volts.
2A2A9F3 .....................................
3 AMP..........................................
2A2A9F4 .....................................
1/2 AMP.......................................
-6 volts.
2A2A6F1 .....................................
1/10 AMP.....................................
High level loop.
Oscilloscope.................................
3A3F1..........................................
1/2 AMP SLO-BLO ......................
AC line.
3A3F2..........................................
1/2 AMP SLO-BLO ......................
AC line.
3A3F3..........................................
1/2 AMP.......................................
+15 volts.
3A3F4..........................................
3/8 AMP.......................................
-15 volts.
3A3A2F1 .....................................
1/10 AMP.....................................
+70 volts.
3A3A2F2 .....................................
1/10 AMP.....................................
-70 volts.
b. All crystals with the exception of 1A2A11Y4 and 2A2A7Y4 are installed at the factory. The two crystals
that are not installed are available as an option and used when the SPARE speed is selected. The crystals for
each major component, their values, reference designation, and speeds for which the crystal is selected are
listed as follows:
Major Component
Reference Designation
Value
Function
Generator .....................................
1A2A11Y1 ...................................
145.440........................................
45.45
1A2A11Y2 ...................................
195.584........................................
61.12.
1A2A11Y3 ...................................
1920.............................................
37.5, 50, 75, 150, 300, 600,
1200, 2400, 4800, 9600
1A2A11Y4 ...................................
OPTIONAL ..................................
SPARE SPEED.
Analyzer........................................
2A2A7Y1 .....................................
145.440........................................
45.45.
2A2A7Y2 .....................................
195.584........................................
61.12.
2A2A7Y3 .....................................
1920.............................................
37.5, 50, 75, 150, 300, 600,
1200, 2400, 4800,9600.
2A2A7Y4 .....................................
OPTIONAL ..................................
SPARE SPEED.
2-10. Initial Adjustment
b. Check to see that the rear panel cable connections are made in accordance with the procedure in
paragraph 2-6b.
NOTE
The use of the extender card for this procedure is optional. All adjustments are accessible
with-the 2A2A6 card in place, but the adjustments are more convenient with the extender
inserted.
c. Open the front panel of the analyzer and remove 2A2A6 from its position.
d. Insert the extender card into the 2A2A6 position, and the 2A2A6 into the extender card.
switch to FREE RUN.
2-10
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