Install guide

ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
h. It is possible to speed entry of survey data to
examine malfunction codes (refer to table 3-4) by enter-
ing a one-digit coordinate for each entry (e.g., 0.1
meter). However, an IMU failure will be indicated if
alignment is allowed to proceed past MODE 4.
3-6. Alignment. PADS starts to align itself at tumon
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
the MON function is selected. MODE 8 signifies com-
pletion of alignment.
a. Movement of the IMU must be avoided during
alignment. Do not move or jar the system. If excessive
movement is experienced during alignment, the ATTN
indicator will light and the CAL indicator extinguish, or
the STOP indicator may extinguish and GO flash. If this
occurs, turn PADS off and restart the initialization
procedure.
b. The system should be level to ±5 degrees. If not,
the display will show LEVEL starting in monitor
MODE 3. The LEVEL display locks out the monitor
mode unless a malfunction occurs, If possible, move
PADS to a more level surface and restart the test. If this
is not possible, PADS will continue to align with possi-
ble degraded accuracy.
c. Zero-velocity corrections are needed for accurate
surveying. One begins automatically during alignment.
After alignment and system movement, PADS requests
zero-velocity correction stops by flashing the GO and
STOP indicators and beeping ALARM DS3 30 seconds
before the next correction. The operator has 30 seconds
to stop the vehicle and press STOP. If he does not, the
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.
3-7. Cable Testing/Connector Adjustment (see figure
3-2).
a. Inspect cables for bent or broken connector pins;
locking ring, connector shell, backshell, or cable
clamp; and cut or tom sheath. Replace if any of
these defects are found. Return cables with bent
or broken pins to general support maintenance
for repair.
b. Carefully inspect connectors with right angle
backshells for rotation in excess of ±10 degrees.
Adjust as necessary as follows:
(1)
(2)
(3)
(4)
Remove safety wire securing retaining ring to
backshell.
Mate connector to its fixed counterpart and
tighten retaining ring using a strap wrench.
Rotate backshell for proper cable clearance.
Secure retaining ring to backshell with safety
wire.
c. Test cables for correct continuity between pins
and backshell. Wiring diagrams are shown in
figure FO-4.
Section Il. TOOLS AND EQUIPMENT
3-8. General. Tools and materials required for direct
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 Change 6