Troubleshooting 2-Port Cleargain Dual Duplex Tower Mounted Amplifiers - ADC ClearGain User Manual

ADCP-75-154 • Issue 3 • August 2006
2. Every output has a green LED, and it must be on if the output is used. Check that all the
green LED's on the used outputs are on.
3. If one of the used outputs has a LED off, there is something wrong with the PDU, Bias-T,
MHU, or the feeder cable.
4. Disconnect the mini coaxial cable from the PDU and measure from the connector, that the
PDU feeds 12VDC to the Bias-T. Do this measurement using a multimeter (Voltage
measurement, DC). If there is 11-13 VDC found from the connector, there is something
wrong with the Bias-T, MHU, or cables.
5. Shut the transmit power OFF from the BTS, and disconnect the coaxial cable from the
Antenna side of the Bias-T. Measure that the Bias-T feeds 12VDC to the MHU.

4 TROUBLESHOOTING 2-PORT CLEARGAIN DUAL DUPLEX TOWER MOUNTED AMPLIFIERS

If trouble is visually indicated by LED's or no illumination on a specific TMA, swap Bias-T
cables on PDU ports to see if trouble remains or moves. Reference
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© 2006, ADC Telecommunications, Inc.
Figure 13.