3-18. OPERATIONAL CHECK.
The operational check provides a step-by-step procedure for evaluating the reference fixture and the test
adapter. If the operational check is passed, the reference fixture may be returned to service. If it does not pass
the test, the bad unit or the troubleshooting chart to be used will be identified. The troubleshooting flowcharts are
in paragraph 3-21.
Continuity checks of the test adapter can be performed using the schematic (figure FO-19) and an ohmmeter, if
necessary. Use the operational check in TM 11-5820-890-20-1 for the ECCM fill device.
The operational check requires the use of a second RT, which is known to be good, to serve as the reference RT.
Obtain this RT from another maintenance group.
The operational check is divided into steps. Each step verifies a particular function. Follow the instruction in the
Action column. Check the response. If the response is correct, proceed with the next lettered step. When a
Step has been completed, proceed with the next Step. A No response in the Response column means that
any response is not of interest.
When instructed, set up the test equipment as indicated in the figures. Each figure shows the proper switch
settings for the test equipment.
Connect the test setups only when directed, and with the power supply set to OFF. The large
current capacity of the test power supply can cause personal injury. Verify the test setup before
turning the power supply on.
High voltage (200 V dc) is present at mounting adapter connector J1 and inside the test adapter.
Use caution when connecting the test setup and taking measurements to avoid personal injury.