Harris ZX2500, Technical Manual

Page: 112 / 198

5-8 888-2595-001 12/20/11
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WARNING: Disconnect primary power prior to servicing.
Section 5 Maintenance and Alignments
ZX Series
5.3 Basic Maintenance Procedures
The maintenance procedures provided in this section may be routinely performed by
operators with basic technical skills. No special equipment or training is required.
5.3.1 Power Amplifier (PA) Module Swap Procedure
The PA modules are hot-pluggable and may be swapped at any time while the
transmitter is operating. Any PA module may be swapped with a PA module in another
position, including the PA module in the IPA position. PA modules may also be rotated
180 degrees and swapped “top to bottom.”
Tools required:
None
STEP 1
If a failed PA module is suspected, verify failure by looking for these
tell-tale signs:
a.
Output power has dropped significantly.
b.
Front panel STATUS LED has shifted from green to yellow.
c.
PA MODULE SHUTDOWN alarm reported on controller board
(reverse side of amplifier front door).
d.
PA(PS) ON LED of corresponding PS module extinguished, while
others modules are still lit.
NOTE:
The green “ON” status LEDs for the IPA module halves are located behind the
IPA module heatsink (seen through heatsink fins).
STEP 2
Open amplifier front door.
STEP 3
Loosen PA module thumb screws immediately above and below affected
PA module.
STEP 4
Unplug PA module from transmitter. If not already extinguished,
PA(PS) ON LED on corresponding PS module should extinguish. PA
MODULE SHUTDOWN LED on controller card should light.
!
WARNING:
PA MODULES ARE DESIGNED TO HANDLE VERY HIGH TEMPERATURES AND MAY
BE EXTREMELY HOT. DO NOT TOUCH MODULE SIDES WITH BARE HANDS AFTER