GL-T8541 PA
Glenayre Document Number: 9110.01002
CHECKOUT AND MAINTENANCE
09/10/99
Page: 7-12
Copyright © 1997 Glenayre
7.8 Resume Paging Operation
Maintenance procedures often require local control of the transmitter, obtained through the
exciter VDT. This causes normal paging operation to cease, and allows the operator to
control the transmitter and perform specific tests. Make sure the transmitter is taken off
local control before leaving the site.
7.9 Maintenance Log
A maintenance log of normal power amplifier readings should be maintained. These
readings are obtained form the DSP exciter VDT. They should be made for all the trans-
mitter’s normal operating channels, and if the power amplifier is operated at different
power levels, readings for each power level should be maintained.
The maintenance log should contain a record or maintenance procedures performed. It
should also contain a brief description of any troubles encountered, the trouble symptoms,
any repairs performed, and any alignment procedures used.
7.10 Troubleshooting
General power amplifier problems can occur in four areas of the power amplifier system,
they are:
• the PA module
• the metering board
• the fan panel
• the dc, control or RF cabling.
The PA and exciter can be removed from the front of the transmitter chassis, after the
rear-panel cables and front-panel-fastening screws are removed. The PA module is
mounted on slides. The metering board is mounted on the outside of the rear panel of the
PA module. It is accessed by loosening the fan panel thumb screws and swinging the fan
panel open or by removing the top cover of the transmitter chassis. The chassis top cover
is held in place by four thumb screws.
7.10.1 Troubleshooting Chart
Table 7-3 is a chart of symptoms and causes that should aid in the power amplifier
troubleshooting.
