User's Manual

Digital UHF Transmitter Chapter 1, Introduction
DT835A, Rev. 1 1-2
hazards. Please contact the Axcera
Technical Service Department if you have
any questions regarding service or
replacement parts.
1.3 Maintenance
The DT835A is designed with
components that require little or no
periodic maintenance except for the
routine cleaning of the fans and the front
panels of the trays.
The amount of time between cleanings
depends on the conditions within the
transmitter room. While the electronics
have been designed to function even if
covered with dust, a heavy buildup of
dust, dirt, or insects will affect the
cooling of the components. This could
lead to a thermal shutdown or premature
failure of the affected trays.
When the front panels of the trays
become dust covered, the top covers
should be removed and any accumulated
foreign material removed. A vacuum
cleaner, utilizing a small wand-type
attachment, is an excellent way to
suction out the dirt. Alcohol and other
cleaning agents should not be used
unless you are certain that the solvents
will not damage components or the silk-
screened markings on the trays and
boards. Water-based cleaners can be
used, but do not saturate the
components. The fans and heatsinks
should be cleaned of all dust or dirt to
permit the free flow of air for cooling
purposes.
It is recommended that the operating
parameters of the transmitter be
recorded from the meters on the trays
and the system metering control panel at
least once a month. It is suggested that
this data be retained in a rugged folder
or envelope. A sample format for a log
sheet is provided in Appendix A.
Photocopies of the log sheet should be
made for continued data entries.
1.4 Material Return Procedure
To insure the efficient handling of
equipment or components that have been
returned for repair, Axcera requests that
each returned item be accompanied by a
Material Return Authorization Number
(MRA#).
An MRA# can be obtained from any
Axcera Field Service Engineer by calling
the Axcera Field Service Department, at
[phone]. This procedure applies
to all items sent to the Field Service
Department regardless of whether the
item was originally manufactured by
Axcera.
When equipment is sent to the field on
loan, an MRA# is included with the unit.
The MRA# is intended to be used for the
return of the unit to Axcera. In addition,
all shipping material should be retained
for the return of the unit to Axcera.
Replacement assemblies are also sent
with an MRA# to allow for the proper
routing of the exchanged hardware.
Failure to close out this type of MRA# will
normally result in invoicing for the value
of the loaner item or the exchange
assembly.
When shipping an item to Axcera, please
include the MRA# on the packing list and
on the shipping container. The packing
slip should also include contact
information and a brief description of why
the unit is being returned.
Please forward all MRA items to:
Axcera
103 Freedom Drive
P.O. Box 525
Lawrence, PA 15055-0525 USA
For more information concerning this
procedure, call the Axcera Field Service
Department, at [phone] or by
fax at [phone].
Axcera can also be contacted through e-
mail at [e-mail] and on the
Web at www.axcera.com.