TM 11-6625-1668-12
4-7. Quarterly Preventive Maintenance Checks and Services
Sequence
Item
Procedure
References
No.
1
Preservation. ............................
Check all surfaces for evidence of fungus. Remove rust and corrosion and
spot-paint bare spots.
2
Publications..............................
See that all publications are complete, serviceable, and current.
DA-Pam 810-4
3
Modifications ............................
Check DA Pam 810-7 to determine if new applicable MWO's have been
TM 88750 and
published. All URGENT MWO's must be applied immediately.
DA Pam 810-
NORMAL routine MWO's must be scheduled.
7.
4
Spare parts...............................
Check all spare parts (operator and organizational) for general condition and
method of storage. There shall be no overstock, and all shortages must
be on valid requisitions.
5
Daily preventive maintenance
Perform the daily preventive maintenance checks and services.
checks and services
6
Weekly preventive maintenance
Perform the daily preventive maintenance checks and services.
checks and services.
7
Test set operational distortion
a. Set the generator and analyzer BAUD RATE switches to 1200.
check.
b. Set the analyzer DISPLAY MODE switch to DIST. And read 25% switching
bias 2 counts.
d. Set all the generator SELECTED CHARACTER BIT switches to space
except for 1 and 2. Note that the distorted 5 level character "A" is
displayed on the oscilloscope.
(1) Nixie display indicates 25 2 counts.
(2) Analyzer space/start lamp illuminates.
(3) Oscilloscope displays spacing bias.
f. Set the DISTORTION SELECT switch to BIAS, M and note that-
(1) Nixie display indicates 25 2 counts.
(2) MARK/FINISH lamp is illuminated.
(3) Oscilloscope displays marking bias.
g. Set DISTORTION SELECT switch to END S/S, M, and note that-
(1) Nixie display indicates 00 2 counts.
(2) Oscilloscope displays marking end distortion.
h. Set DISTORTION switch to AVG END M/S, and note that-
(1) Nixie display indicates 25 2 counts.
(2) MARK/FINISH lamp is illuminated.
(3) Oscilloscope displays marking end distortion.
i. Set DISTORTION SELECT switch to END S/S, S and note that-
(1) Nixie display indicates 25 2 counts.
(2) SPACE/START lamp is illuminated.
(3) Oscilloscope displays spacing end distortion.
j. Set DISTORTION switch to PEAK TOTAL, and note that
(1) Nixie display indicates 25 2 count
(2) Oscilloscope displays spacing end distortion.
k. Set DISTORTION switch to PEAK EARLY, and note that-
(1) Nixie display indicates 25 2 count.
(2) Oscilloscope displays spacing end distortion.
l. Set DISTORTION switch to PEAK LATE, reset the nixie display and note
that-
(1) Nixie display indicates 00 2 counts.
(2) Oscilloscope displays spacing end distortion.
m. Set all POWER switches to OFF.
4-3
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