ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
h. It is possible to speed entry of survey data to
zero-velocity correction stops by flashing the GO and
examine malfunction codes (refer to table 3-4) by enter-
STOP indicators and beeping ALARM DS3 30 seconds
ing a one-digit coordinate for each entry (e.g., 0.1
before the next correction. The operator has 30 seconds
meter). However, an IMU failure will be indicated if
to stop the vehicle and press STOP. If he does not, the
alignment is allowed to proceed past MODE 4.
GO indicator extinguishes, STOP indicator continues to
flash, ALARM DS3 sounds steadily, and data display
reads STOP. A zero-velocity stop should not be re-
quested during test under normal circumstances.
and automatically continues alignment after the survey
data is entered (paragraph 3-5). Alignment takes 30 to
40 minutes. During this period the data display will
show a sequence of alignment MODES O thru 8 when
a. Inspect cables for bent or broken connector pins;
the MON function is selected. MODE 8 signifies com-
locking ring, connector shell, backshell, or cable
pletion of alignment.
clamp; and cut or tom sheath. Replace if any of
these defects are found. Return cables with bent
a. Movement of the IMU must be avoided during
or broken pins to general support maintenance
alignment. Do not move or jar the system. If excessive
for repair.
movement is experienced during alignment, the ATTN
indicator will light and the CAL indicator extinguish, or
b. Carefully inspect connectors with right angle
the STOP indicator may extinguish and GO flash. If this
backshells for rotation in excess of 10 degrees.
occurs, turn PADS off and restart the initialization
Adjust as necessary as follows:
procedure.
(1) Remove safety wire securing retaining ring to
backshell.
b. The system should be level to 5 degrees. If not,
the display will show LEVEL starting in monitor
(2) Mate connector to its fixed counterpart and
MODE 3. The LEVEL display locks out the monitor
tighten retaining ring using a strap wrench.
mode unless a malfunction occurs, If possible, move
(3) Rotate backshell for proper cable clearance.
PADS to a more level surface and restart the test. If this
is not possible, PADS will continue to align with possi-
(4) Secure retaining ring to backshell with safety
ble degraded accuracy.
wire.
c. Test cables for correct continuity between pins
c. Zero-velocity corrections are needed for accurate
and backshell. Wiring diagrams are shown in
surveying. One begins automatically during alignment.
After alignment and system movement, PADS requests
Section Il. TOOLS AND EQUIPMENT
support maintenance are listed in table 3-2. Repair
parts are listed in TM 5-6675-308-24P, or Marine Corps
TM 08837A-24P/3.
3-6.2
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