TM 11-6625 1668-12
Sequence
Item
Procedure
References
No.
3
Knobs dials and switches
Check all front panel controls for smooth mechanical operation.
4
Fuses and crystals
Open hinged front panels and check fuses and crystals for correct value and
proper location.
5
Plug-in assemblies
Check each plug-in assembly for proper location and secure engagement with its
connector.
6
Mounting
Check all mounting hardware for tightness and secure fit.
4-6. Weekly Preventive Maintenance Checks and Services
Sequence
Item
Procedure
References
No.
1
Daily preventive maintenance
Perform the daily preventive maintenance checks and services.
checks and services...........
2
Generator indicator lamps ........
a. Set the generator POWER switch to ON and note that the POWER lamp
illuminates
b. Set the generator MESSAGE SELECT switch to M and note the SIGNAL
lamp illuminates.
c. Set the BAUD RATE switch to SPARE (spare speed option must not be
exercised) and note that the ALARM lamp illuminates, within 2 to 8
seconds.
3
Analyzer indicator lamps ..........
a. Perform the preliminary starting procedures for the generator and analyzer.
b. Set the analyzer MARK POLARITY switch to + and the INPUT switch to
HIZ.
the BRIDGING input jack of the analyzer.
analyzer POWER lamp, SIGNAL lamp, and nixie display illuminates.
e. Set the generator DISTORTION SELECT switch to BIAS, SW and the
PERCENT DISTORTION switch to 25. Note that the analyzer MARK
and SPACE lamps illuminate.
f. Set the DISPLAY MODE switch to PEAK MON, and note that the
OVERFLOW lamp illuminates after a count of 99 when the display is
reset.
g. Set the analyzer BAUD RATE switch to SPARE (spare speed option must
not be exercised) and note that the CLOCK lamp illuminates within 2 to 8
seconds.
4
Oscilloscope indicator lamp. ....
a. Perform the preliminary starting procedure for the oscilloscope.
b. Set the oscilloscope POWER switch to ON and note that the POWER lamp
illuminates.
5
Generator speed ......................
Rotate the generator BAUD RATE switch slowly through all 14 positions. Note
that the OSC FAILURE lamp illuminates, only in the SPARE and EXT.
positions when these options are not exercised. (Pause for 8 seconds at
each position of the BAUD RATE switch.)
6
Analyzer speeds.......................
Rotate the analyzer BAUD RATE switch through all 14 positions. Note that the
CLOCK lamp illuminates only in the SPARE and EXT. positions when
three options are not exercised. (Pause for 8 seconds at each position
of the BAUD RATE switch.)
Note. This completes the weekly preventive maintenance checks and services. Set all
POWER switches to OFF, if not proceeding with the quarterly preventive
maintenance checks and services.
4-2
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