ARMY TM 9-6675-349-12&P
MARINE CORPS TM 11039A-12&P
SECTION V. OPERATOR TROUBLESHOOTING
4-6. General.
When an
IPADS component fails, the failed
area is readily identified
through the internal fault
isolation process. IPADS possesses a Built-In Test (BIT). This BIT allows the operator to identify the
component or group of components with the fault. Fault identification is displayed in one of three ways. For
the CPNU, a message will be sent via the CDU. The CDU contains its own internal BIT that will notify of a
specific failure in the CDU. A BCU failure is displayed through the LEDs on the front and top of the BCU. On
the CDU STATUS page the operational status of the CPNU can be checked. The software versions used on
IPADS and the IPADS Elapsed Time Indicator (ETI) are also displayed on the STATUS page. This section
describes troubleshooting to isolate faults to a specific LRU (BCU, CDU, or CPNU). Before performing
troubleshooting tasks, carefully read the operating instructions and follow all notes, cautions, and warnings.
Malfunction
Test or Inspection
Corrective Action
NOTE
If possible, troubleshoot by replacing with another known good Line Replaceable Unit (LRU).
This will isolate the problem to the LRU or cable.
1.
IPADS will not power up.
Step 1. Inspect all cables to ensure they are not cut or pinched and are connected securely at the
connectors.
a. If all cables are in serviceable condition, take off and reconnect at each connector.
c. If any cable is not serviceable, turn in for repair, paragraph 4-7.
d. If cables are serviceable, go to Step 2.
Step 2. Check to ensure all power switches on the BCU and CDU are ON.
a. Place switches to the ON position.
b. If switches are already on go to step 3.
Step 3. If connected to vehicle, check to ensure the BCU DC Power Input LED is illuminated.
b. If power cable is good, check vehicle battery.
Step 4. If connected to AC power, check to ensure the BCU AC LED is illuminated.
b. Notify maintenance support.
c. If cable is not serviceable, turn in for repair.
4-7