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Maintenance
Coastal 18 Ku-Band TVRO
6-4
tests fails. If any test fails, replace the PCU and re-run BIT tests.
6.5.2. DAC Test
This test checks the basic integrity of the Digital-to-Analog Converter on the PCU main board by looping
back one of it’s outputs to the A/D.
“Testing DAC” will be displayed as the test runs. An Error code 2.01-2.21 will be displayed if one of these
tests fails. If any test fails, replace the PCU and re-run BIT tests.
6.5.3. AZ Motor Driver Test
This test checks the ability of the motor driver to drive current through the Azimuth motor. The current to
the motor is controlled by a PWM circuit. The PWM current is repeatedly sampled and statistically
analyzed during this test.
“Testing AZ MTR” will be displayed as the test runs. An Error code 3.01-3.17 will be displayed if one of
these tests fails.
A failure indicates a failed motor, Motor Driver PCB or harness. Temporarily connect a spare motor to the
PCU in place of the failed motor (or swap the AZ motor with the EL or POL motor connection at the PCU)
to isolate the failure to the PCU or MOTOR. When re-running the same test:
If the test passes, replace the failed motor (if you swapped motors the other motor test will not
fail) and re-run the BIT tests.
If the test fails, replace the PCU and re-run the BIT tests.
6.5.4. EL Motor Driver Test
This test checks the ability of the motor driver to drive current through the Elevation motor. The current to
the motor is controlled by a PWM circuit. The PWM current is repeatedly sampled and statistically
analyzed during this test.
“Testing EL MTR” will be displayed as the test runs. An Error code 4.01-4.17 will be displayed if one of
these tests fails.
A failure indicates a failed motor, Motor Driver PCB or harness. Temporarily connect a spare motor to the
PCU in place of the failed motor (or swap the EL motor with the AZ or POL motor connection at the PCU)
to isolate the failure to the PCU or MOTOR. When re-running the same test:
If the test passes, replace the failed motor (if you swapped motors the other motor test will not
fail) and re-run the BIT tests.
If the test fails, replace the PCU and re-run the BIT tests.
6.5.5. POL Motor Driver Test
This test checks the ability of the motor driver to drive current through the Polarization motor. The current
to the motor is controlled by a PWM circuit. The PWM current is repeatedly sampled and statistically
analyzed during this test.
“Testing POL MTR” will be displayed as the test runs. An Error code 5.01-5.17 will be displayed if one of
these tests fails.
A failure indicates a failed motor, Motor Driver PCB or harness. Temporarily connect a spare motor to the
PCU in place of the failed motor (or swap the POL motor with the AZ or EL motor connection at the PCU)
to isolate the failure to the PCU or MOTOR. When re-running the same test:
If the test passes, replace the failed motor (if you swapped motors the other motor test will not
fail) and re-run the BIT tests.
If the test fails, replace the PCU and re-run the BIT tests.
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