ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 4-14.1. IMU Testing, Alignment, and Troubleshooting Using Tape
Reader, Part No. 877406-2 - Continued
Malfunction
indication/corrective action
Normal indication
Test procedure
1i. Lift tape reader read head cover;
No. 10 LED indicator lights steady
install IMU alignment data tape,
for IMU being tested, on tape
reader. Tape is located in stor-
age container on IMU connector
2J2. Be careful not to tangle the
coiled tape. Gently lower read
head cover
1j. Ensure that tape reader FAST/
SLOW switch is set to SLOW
Tape stops in middle or does not stop
1k. Press MEMORY LOAD switch-
MEMORY LOAD switch-indicator
at end Rewind tape and reload.
indicator to on
lights. Tape reader reads tape and
Make sure tension is applied to
stops at end of tape
the front of the tape to ensure the
sprocket wheel is properly engaged
1l. Press MEMORY LOAD switch-
MEMORY LOAD switch-indicator
goes off
indicator to off
1m. Deleted
REVERSE switch-indicator lights.
1n. Press REVERSE switch-
Tape rewinds and stops near
indicator to on
beginning
REVERSE switch-indicator goes off
1o. Press REVERSE switch-
indicator to off
1p. Press VERIFY switch-indicator
Tape does not stop at end: Rewind
VERIFY switch-indicator lights. Tape
tape and verify
to check tape against memory
reader reads tape and stops at end
contents
of tape
Tape stops before end and VERIFY
ERROR indicator lights: Rewind
tape, reload and verify
VERIFY switch-indicator goes off
1q. Press VERIFY switch-indicator
to off
1r. Lift tape reader read head cover
and remove tape from tape
reader and store in container on
IMU connector 2J2
PADS ON/OFF switch-indicator goes
1s. Press PADS ON/OFF switch-
indicator, then ENTER
off
PADS turn off
1t. Set PS BATTERY and VEHI-
CLE circuit breakers CB1 and
CB2 to OFF. Set TTY MOTOR
Switch to OFF
Press SPU ON switch-indicator
SPU ON switch-indicator goes off
to OFF
Change 7
4-90.3