TM 11-5840-281-12-1
4-32. ORGANIZATIONAL TROUBLESHOOTING. (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
If any voltages above are not within tolerances indicated, replace receiver-transmitter low-voltage
power supply (para 4-40) and perform receiver-transmitter power supply adjustment (para 4-41).
6.
Indicator switches on transmitter control panel do not light when pressed.
Remove lamp from switch (para 4-38) and test for continuity.
Replace defective lamp. If problem persists, refer to a higher category of maintenance.
7.
Ppi sweep length is short in any range on either control-indicator.
Perform ppi display adjustments (para 4-28).
If ppi display adjustments do not correct problem, refer to a higher category of
maintenance.
8.
Timebase sweep is short or does not begin under center grid line of navigational grid in any range on either
control-indicator, when in NORM, 350 EL, 600 AZ, or SIMULT mode.
Perform precision display adjustments (para 4-28).
If precision display adjustments do not correct problem, refer to a higher
category of maintenance.
9.
Intensified dot but no timebase sweep on crt of either control-indicator when NORM, 350 EL, 600 AZ, or
SIMULT mode.
Step 1.
Place BITE-AZ TILT switch to BITE position and place BITE SELECT switch to - 18V VERT position.
Observe AZ TILT/BITE meter indication.
a. If meter indicates in green zone, proceed to step 2.
b. If no meter indication is obtained, replace 18V voltage regulator card (para
c.
If meter indicates other than green zone, adjust 18V voltage regulator card
as indicated in 1 through 3.
1.
Set up multimeter to measure - 20 v.
2.
Connect positive lead of multimeter to J616 DC RET and connect
negative lead to J615 BITE MON.
4-111
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