Periodic Cleaning And Inspection - Harris ZX2500 Technical Manual

Section 5 Maintenance and Alignments
STEP 5
STEP 6
STEP 7
5.4.9
The ZX amplifier chassis should be periodically opened, inspected for dust buildup, and
cleaned. This inspection should also check for signs of progressive damage, such as
cracking cables or evidence of heat stress/burning. In the case of a single amplifier
chassis transmitter (ZX2500 / ZX3750 / ZX5000), the transmitter must be switched off
and mains power removed to perform safely many of the steps given below. In the case
or larger model transmitters (ZX7.5 / ZX10), one PA chassis may be shut down and
serviced while the other continues transmitting. Please consult the section 5.4.10 for a
procedure to follow to safely service one PA chassis at a time.
Tools required:
Workshop light
Vacuum cleaner with hose & nozzle attachments
Hex key set or screwdriver set for tightening mains connections
STEP 1
STEP 2
STEP 3
STEP 4
STEP 5
STEP 6
STEP 7
5-26
WARNING: Disconnect primary power prior to servicing.
Adjust REV APC LIMIT potentiometer in each PA chassis until red
REVERSE FOLDBACK alarm just lights on controller board.
Restore all connections to original positions when finished.
Procedure complete.

Periodic Cleaning and Inspection

While transmitter is still operating at full power, inspect all external
transmission line sections for localized discolorations or "hot spots" that
are warm/hot to the touch.
a. If localized heating is found, switch off transmitter, open transmis-
sion line, and inspect for loose bullets (anchor connectors), split bul-
lets, contaminations, or other irregularities.
Press front panel OFF button to switch transmitter off.
Remove all AC mains power to transmitter, including exciter(s).
Take steps to ensure AC mains connection is securely locked out and
inadvertent mains re-application is not possible while maintenance is
being performed.
Open all mains access panels and inspect all mains connections for
tightness, corrosion, or signs of localized burning.
Open transmitter front door and locate hex key in holder to right of PA
modules.
Use hex key to open amplifier chassis rear door.
888-2595-001
ZX Series
12/20/11