4-9. REPAIR PARTS
Repair parts are listed and illustrated in TM 11-5821-333-23P.
Section Ill. TROUBLESHOOTING
This section has an operational check and troubleshooting flow charts.
The operational check provides a com-
plete evaluation of the dra.
If passed, the dra can be returned to service. The troubleshooting flowcharts are
used when the dra fails an operational check step. The troubleshooting flowcharts are used to find the bad
When a dra is received for troubleshooting, do the following:
a. Inspect dra for damage. Repair any damage before proceeding.
b. Do the operational check.
c. Do any troubleshooting called for by the operational check.
d. Replace the bad module.
e. Verify the repair by doing all of the operational check.
4-11. OPERATIONAL CHECK
The operational check is a series of steps used to evaluate dra operation. They are used both during
troubleshooting and to verify the dra is good after repair.
Test Description. Each step checks the response of the dra to an operator action. The steps are numbered so
they can be used for reference on maintenance worksheets.
Each step is titled according to the function being
How to Proceed. If normal results are found proceed to the next step. If abnormal results are found, replace the
indicated module or go to the indicated troubleshooting flowchart.
Connect the test setups only when directed and with the power supply turned off. The large
current capacity of the test power supply can cause personal injury. Verify the test setup before
turning the power supply on.
To avoid damage to equipment, always set DC switch on test adapter to OFF before turning
power supply on.
Before setting DC switch on test adapter to ON, always set ref rt and ref rcu FUNCTION
switches to STOW or OFF. Failure to do so may damage an rt or rcu.