LX Series Digital
Chapter 2, Amplifier Assembly Description,
Power Amplifier Assembly
Maintenance & Remote Control Connections
Volume 2, Rev. 1
2-12
transmitter software version 1.4 and
above.
RF System Interlock
A RF System Interlock signal is provided
through TB30-5. When this interlock
circuit is completed to ground such as
through a jumper between TB30-5 and
TB30-15, the transmitter is allowed to
operate. If this circuit is opened, the
transmitter switches to a Mute condition.
The interlock must be in place for the
system to operate. This interlock circuit
may be completed through coax relay
contacts and/or reject load contact
closures to assure the RF output system
is available to receive the transmitter's
output RF signal before the transmitter
is allowed to operate. This feature is
implemented in transmitter software
version 1.4 and above.
Operating Frequency
NOTE:
The exact output frequency of
the transmitter was set at the factory
and needs no customer adjustment.
If change of frequency is required, refer
to Volume 1 Chapter 5 of the Instruction
Manual for more information and to the
Axcera field support department at 724-
873-8100.
2.4 Maintenance
The LX Series Transmitter 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 modules.
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 the
premature failure of the affected
modules.
When the front panels of the modules
become dust covered, the top covers
should be taken off and any accumulated
foreign material should be 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 modules 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 amplifier assembly and
transmitter be recorded from the LEDs on
the modules and the LCD system
metering on the control/monitoring
module at least once a month. It is
suggested that this data be retained in a
rugged folder or envelope.
2.5 Customer Remote Connections
The remote monitoring and operation of
the transmitter is provided through
terminal blocks TB30 and TB31 located
on the rear of the chassis assembly. If
remote connections are made to the
transmitter, they must be made through
terminal blocks TB30 and TB31 at the
positions noted on the transmitter
interconnect drawing and Table 2-6.
