TM 11-5840-360-14-1-1
5.7.2.4 Sheave Alignment Check (V4). - Check sheave
5.8.1 General
alignment as follows.
System level troubleshooting is based on system
performance checks. A performance check procedure
CAUTION
is provided in paragraph 5.8.2 for each version (V)1,
BE AWARE OF THE ANTENNA
(V)2, (V)3and (V)4 of the AN/SPS64(V) Radar Set.
ARRAY POSITION AT ALL TIMES
These procedures check the major operating
WHILE
PERFORMING
THE
parameters of the radar sets and provide initial fault
FOLLOWING STEPS.
isolation sorting at the system level. Associated with
each procedural step is a reference to the appropriate
1. At Receiver Transmitter RT-1241, disable high
equipment troubleshooting procedure in Section IV.
voltage by opening interlock switch S6.
When faulty indications are observed during the system
2. Set Indicator (master) POWER switch to TX
performance check, record the step numbers at which
ON; set Antenna Safety switch to ON.
the faulty indications are noted, and proceed with the
3. Open access door at front of pedestal.
performance check.
Upon completion of the
performance check, analyze the faulty indications to
4. Observe sheaves and drive belts as antenna
determine if a logical pattern (indicating a common
rotates; verify sheaves are aligned vertically and line of
fault) exists. If so, refer to the performance check step
travel of belts is straight. If incorrect, note position of
most closely related to the suspected common fault and
drive sheave (too low or too high), and adjust as follows.
proceed to the equipment troubleshooting chart
5. Set Antenna Safety switch to OFF. Remove
referenced in that step. If no pattern is recognized, refer
bottom access cover at rear of pedestal.
to the step at which the first faulty indication was noted
6. Remove three hex screws from bottom of drive
and proceed to the referenced troubleshooting chart.
sheave hub; place these screws in the three threaded
holes in the hub and tighten in a uniform pattern (this
5.8.2 Performance Verification Procedures
loosens the hub and sheave from the motor shaft).
7. Adjust the vertical position of the drive sheave
on the motor shaft as noted in step 4 to correct
performance verification procedures for each version of
alignment.
the AN/SPS-64(V) Radar Sets. Perform the steps of the
8. Remove the three hex screws from the bottom
paragraph applicable to the radar set installed. The data
of the drive sheave hub and place in the three
enclosed in slashes / / following each step defines the
unthreaded holes in the hub; tighten into the sheave in a
figure number and applicable entry point of the
uniform pattern.
associated troubleshooting chart, e.g., /5-2(19)/ refers to
9. Set Antenna Safety switch to ON and repeat
instruction box log number (19) on Figure 5-2.
step 4. If alignment is incorrect, repeat steps 5 through
9 until alignment is achieved.
5.8.2.1 AN/SPS-6L4(V)1 System Performance
Check. - Perform the following steps in the sequence
5.7.2.5 Access Hatch Gasket Inspection (V4). - Inspect
indicated:
access cover gaskets as follows:
1. Set Indicator POWER switch to ST BY; verify
1. Open access door at front of pedestal. Remove
the following:
top and bottom access covers at rear of pedestal.
a. Lamps on control panel, bearing scales
2. Inspect door and cover gaskets for breaks or
and plotter illuminate. /5-9(1)/
b. Status indicator (LED adjacent to POWER
3. Check door and cover gasket mating surfaces
switch) flashes slowly (approximately
for evidence of seepage.
once per second). /5-2 (1)/
2. Set Indicator POWER switch to TX ON; after
5.7.3 Receiver Transmitter RT-1241 Air Filter Cleaning
3.5 minute time delay, verify the following:
(V4)
b. Status indicator glows steadily. /5-2(22)/
Loosen captive screws and remove both air filter
3. Set Indicator RANGE SELECT switch to each of
covers from cabinet front cover. Remove air filters and
its eleven positions in turn; verify the following at each
wash in warm fresh water with detergent.
Rinse
position
thoroughly in fresh water and allow to dry before
a. Sweep present. /5-8(4)/
reinstalling.
b. Video targets displayed. /5-8(4)/
SECTION III: SYSTEM MAINTENANCE AND
c. Range rings, electronic bearing line (EBL)
PERFORMANCE CHECKS
and heading line displayed. /5-8(4)/
5.8 SYSTEM TROUBLESHOOTING
5-6
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