TM 5-6675-319-14
Table 7-4. ORGANIZATIONAL TROUBLESHOOTING - Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4 .
DRIVE MOTOR INOPERATIVE - Cent
Step 3.
Check motor control fuse FU1 for continuity.
( a ) I f c o n t i n u i t y d o e s n o t e x i s t , r e p l a c e f u s e ( p a r a g r a p h 7 - 1 6 . 1 ) .
( b ) I f c o n t i n u i t y e x i s t s , r e p l a c e T I L T a n d M A G c o n t r o l l e r.
5.
MOTOR CONTROL FUSE FU-1 FAILS CONTINUALLY IN SLOW SPEED.
Step 1.
Check motor cable lead for shorts or grounds.
(a) If cable is good, proceed to step 2.
(b) Repair or replace cable.
Step 2.
Check drive motor field for shorts or grounds. Measure resistance
across chassis terminal block pins 10 and 11, if 950 ohms is not
obtained .
Replace drive motor (paragraph 7-16.4)
6. MOTOR CONTROL FUSE FU-1 CONTINUALLY FAILS IN SLEW SPEED.
Step 1.
Check motor cable for shorts or grounds.
(a) If cable is good, proceed to step 2.
(b) Repair or replace cable.
Step 2.
Check motor armature for shorts.
(a) Measure resistance across chassis terminal block pins 8 and
9.
If a 5 to 9 ohm reading is obtained, proceed to step 3.
(b) If 5 to 9 ohms is not obtained, replace drive motor
(paragraph 7-16.4).
Step 3.
Check motor armature for grounds.
Measure resistance from chassis terminal block pins 8 and 9 to
ground.
If a high resistance reading is not obtained, replace
drive motor.
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