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Indoor Broadband Transmitter – ITX02-2000
Lack of Driver +12 VDC
If internal trouble shooting is required due to lack of +12 VDC in the external DC diagnostic test
then check for internal +12 VDC on the terminal strip. If 12 VDC is missing, first disconnect the
wires from the power supply output terminals and recheck the voltage. If the power supply
voltage with no load is not +12 VDC then the power supply is defective and should be replaced.
If the voltage returns to normal, the load on the power supply is too high causing the supply to
go into crowbar and shut down. At this point, examine the wiring harness for an obvious wiring
fault. If no fault is found, then one of the modules supplied by that power supply is shorted
internally and should be replaced. To identify the module lift the DC power wire for each module
one at a time from the terminal block until the DC power bus is restored to normal.
Power Amplifier
If the amplifier output is too low, check for 12 VDC and available current. Verify that the
amplifier was not cut off due to excessive temperature.
Fan Not Operating
If a fan is not operating, check for proper voltage on the internal terminal strip. If adequate
voltage is not available, check the transformer.
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IM402513-10 Rev –
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