Harris Broadcast Flexiva FAX 5KW, Technical Manual

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Section-5 Maintenance
October 28, 2013
5 ‐ 10
Copyright ©2013, Harris Broadcast WARNING: Disconnect primary power prior to servicing. 888 ‐ 2720 ‐ 001
STEP 12
Inspect all exposed PC boards for signs of heat discoloration or rings of dried solder flux,
an indication of partial solder melting.
STEP 13
Shine light through combiner cover (but do not remove) to inspect output assembly
combiner coils for any corrosion that is crusty or pasty. It is normal for the coils to
change color over time. This does not negatively impact their performance, provided it is
simple oxidation and not a more aggressive corrosion due to harsh air pollution
components.
STEP 14
Verify all push ‐ on (faston) connections are fully seated on PA backplanes, PS interface
board, AC mains inputs, etc.
STEP 15
Shine light through combiner support frame to deck of output assembly and inspect
ballast loads for burning or cracking.
STEP 16
Close amplifier chassis rear door.
STEP 17
Return hex key to storage position.
STEP 18
If transmitter is FAX20kW, visually inspect the 6kW RF reject load on rack cabinet upper
rear for signs of cracked resistors or other debris.
STEP 19
Remove AC mains lockout precautions and apply AC mains power.
STEP 20
Press front panel ON button to turn transmitter on.
STEP 21
Verify transmitter returns to full power and no alarms are reported.
STEP 22
As desired, use off ‐ air opportunity to verify integrity of all safety interlock circuits such as
station load temp sensor, patch panel position switches, coaxial switch position switches,
etc.
STEP 23
As desired, use off ‐ air opportunity to operate transmitter into station test load and verify
test load integrity.
STEP 24
As desired, use off ‐ air opportunity to verify reserve exciter and exciter switchover
functionality (where applicable).
STEP 25
As desired, use off ‐ air opportunity to verify reserve IPA and IPA switchover functionality.
STEP 26
Note any findings and resolutions in station maintenance log.
5.4 Date and Time Battery
The date/time battery (20mm, 3V, lithium coin battery CR2032) is normally installed at the factory. Check and
verify battery is installed. The battery mounts on the front panel Display/Control board. Perform the following
steps to install or replace the battery.
STEP 1
Open front panel by turning the upper and lower thumb screws counterclockwise.
STEP 2
Swing the panel door open to access the Display/Control board located along the top
inside of the door. Note, the battery holder is located on the upper left hand corner of
the board.
STEP 3
Remove battery from package (Pt. No. 660 ‐ 0054 ‐ 000) and slide battery into holder, with
positive side up against clip, until it is fully seated.