Harris Broadcast Flexiva FAX 10KW, Technical Manual

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FAX 5/10/20/30/40KW
October 28, 2013
5 ‐ 9
888 ‐ 2720 ‐ 001 WARNING: Disconnect primary power prior to servicing. Copyright ©2013, Harris Broadcast
STEP 1
Remove PA module from transmitter.
Caution
DO NOT ATTEMPT TO CLEAN THE PA MODULES WITH COMPRESSED AIR
WHILE THEY ARE STILL INSTALLED IN THE TRANSMITTER. THIS WILL
FORCE DUST DEEPER INTO THE TRANSMITTER.
STEP 2
Blow compressed air into heatsink fins to remove dust buildup. If compressed air is not
available, use a vacuum cleaner to suction dust from heatsink.
STEP 3
Use a dry longhair paintbrush to dislodge stubborn dust.
Note
If dirt has built up in the heatsink fins where a paint brush can’t reach, take a piece of cotton cloth and
wedge down between the fins by pulling tight on each end of the cloth. Slide cloth back and forth to
remove dust and dirt. Remove and shake dirt from cloth and repeat in each slot.
STEP 4
Replace PA module in transmitter and repeat for each module.
Warning
REMOVING IPA WHILE TRANSMITTER IS OPERATING WILL CAUSE THE TRANSMITTER
TO SHUTDOWN AND BE OFF AIR.
5.3.3 Periodic Cleaning and Inspection
The FAX 10kW power block 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 power block transmitter (FAX5kW /FAX10kW), the transmitter must be switched off and mains
power removed to safely perform the steps given below. In the case of larger model transmitters (FAX20kW ‐
FAX40kW), one power block may be shut down and serviced while the other(s) continue transmitting. Please
consult section 5 for a procedure to follow to safely service one PA chassis at a time.
STEP 1
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 transmission line, and inspect for loose
bullets (anchor connectors), split bullets, contaminations, or other irregularities.
STEP 2
Press front panel OFF button to switch transmitter off.
STEP 3
Remove all AC mains power to transmitter, including exciter(s).
STEP 4
Take steps to ensure AC mains connection is securely locked out and inadvertent mains
re ‐ application is not possible while maintenance is being performed.
STEP 5
Open all mains access panels and inspect all mains connections for tightness, corrosion,
or signs of localized burning.
STEP 6
Use hex key to open amplifier chassis rear door.
STEP 7
Verify no loose hardware has fallen to bottom of amplifier chassis over time.
STEP 8
Vacuum any dust accumulations from rear chamber of amplifier chassis.
STEP 9
Vacuum any dust accumulations from output assembly. Use long vacuum cleaner
attachment as necessary to gain access to hard to access spots.
STEP 10
Vacuum any dust accumulations from chassis fan blades and PS module fan blades.
STEP 11
Illuminate inside of transmitter rear chamber and inspect all cables for signs of cracking,
abrasions, or heat discoloration.