Cable AML ITX02-2000, Operation Installation Maintenance Manual

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Indoor Broadband Transmitter – ITX02-2000
19
IM402513-10 Rev –
5.0 MAINTENANCE & TROUBLESHOOTING
5.1 Maintenance
Input and output power levels should be measured periodically and adjustments made if
necessary.
The output power level should be measured and adjusted as described in Section 4.0 of this
manual. The input attenuation should be verified before making significant adjustments in the
transmitter.
5.2 External Troubleshooting
In the event of low or no output from the transmitter, the following items should be checked first:
1. Verify the frequency and level of the VHF input signal at VHF Monitor Test Point on the
Monitor panel. Incorrect input frequencies may produce output frequencies that are
unable to pass through the filters or the power amplifier.
2. Verify the AC power input by checking the fans on the power supplies for motion.
3. Check the transmitter meter panel for +12 VDC reading.
4. Check the output power and of the power amplifier.
Note: The expected values of diagnostic signals are listed in the Data Manual.
5.3 Internal Troubleshooting
Internal troubleshooting is the last step in resolving equipment problems and is necessary only
should internal components fail. If a +12 VDC reading is not obtained from the external DC
diagnostic test at the Driver, internal troubleshooting may be required.
!!!!! WARNING !!!!!
Internal troubleshooting requires that:
Power remains on.
Transmitter cover is removed.
CONTACT WITH LINE VOLTAGE CAN BE FATAL!
It is recommended that internal troubleshooting be limited to personnel skilled in maintenance of
microwave transmitters or receivers.
IF IT IS NECESSARY TO REPLACE COMPONENTS, THE REPLACEMENT OF PARTS
SHOULD BE DONE WITH THE EXTERNAL AC POWER DISCONNECTED.