TM 5-6675-250-10
I
3-2. TROUBLESHOOTING
The table lists malfunctions that may occur during operation of the equipment, probable causes of the
malfunction, and action to be taken to correct the malfunction. Where more than one probable cause
exists, follow the sequence shown in the table when performing corrective action. Ensure that equip-
ment is correctly hooked up and properly operated prior to performing troubleshooting procedures.
Report equipment to the next higher level of maintenance when malfunctions cannot be remedied
through the procedures in the following table.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRONIC CONTROL UNIT
1 . POWER ON INDICATOR FAILS TO LIGHT WHEN POWER IS APPLIED AND PANEL ILLUMINATION
CONTROL IS FULLY CLOCKWISE.
Check for a bad power source.
Step 1.
a. With a MODE SELECT switch positioned to SELF TEST and with
PWR ON indicator illuminated, place the TEST SELECT switch to
source voltage.
b. Depress the PRESS TO TEST switch; verify that the test meter
pointer is positioned between 22 and 33 VDC on the upper meter
scale. If the reading is less than 22 VDC, replace the battery or AC-
DC converter.
If AC-DC converter is being used, check for a defective converter
c.
fuse.
d. Unscrew the cap on the fuse holder and remove the fuse.
e. Test fuse for continuity with an ohmmeter. Replace defective fuse.
f. Place the new fuse in cap of the fuse holder. Insert fuse in AC-DC
converter, press down, and turn the cap clockwise to secure the fuse
holder.
3-2
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