Vector-LP Radio Beacon Transmitter Technical Instruction Manual
Page
5-9
Section 5 Maintenance and Troubleshooting
Issue 1.1
5.6 REPLACING AN RF POWER
MODULE
The diagnostic display status messages
indicate which RF power module caused
an alarm. In dual side applications (A and
B), the transmitter should change over to
operate on the standby side.
NOTE
A defective RF power module can be
removed for repair as described below.
After removing the RF power module (in
dual side applications), the transmitter can
resume operation on its standby side.
CAUTION
RF power modules contain solid-state
devices that can be damaged if subjected
to excessive heat or high voltage
transients. Ensure circuits are not
overdriven or disconnected from their loads
while turned on.
5.6.1 RF Power Module Removal
See Figure 5-1.
(a) Remove the top cover from the
applicable RF power module by
removing five M4 screws. RF power
module A is nearer the front of the
transmitter. For some transmitters, it
will also be necessary to remove the
support brackets on either side of the
RF power module. To do this, you will
need to remove the two screws from
the other RF power module’s cover.
(b) If they were not removed during
installation, remove four M4 shipping
screws (for each RF power module)
from the bottom of the transmitter.
These screws are no longer required.
(c) Remove the cable connected near the
top of the RF power module by
releasing the spring latches on either
side of the connector, then unplugging
the connector.
(d) Grip the flanged edge at the top of the
RF power module and carefully lift the
module out of the transmitter cabinet.
(e) Replace a defective FET (see 5.7) or
an entire PWB or assembly (see
Figure MD-10) as necessary.
NOTE
If an operational RF power module is
available, you can install it in the
transmitter while you repair the defective
module. Refer to paragraph 5.6.2 to install
an RF power module.
5.6.2 RF Power Module Installation
CAUTION
Ensure proper orientation of an RF power
module before installing it in the
transmitter. The mating connector at the
bottom of the module (see Figure MD-10)
should face the back of the transmitter.
(a) Carefully insert the operational RF
power module in the appropriate slot in
the top of the transmitter. Align the
module with the guides on each side of
the transmitter. Slide the module down
into the transmitter and push firmly into
place.
(b) Replace the top cover for the
applicable RF power module and
secure using five M4 screws. Three of
these screws fasten to the holes in the
flanged edge at the top of the module.
(c) Press
Reset
in the status menu. Verify
the
PA
or
Power Supply
lamp on the
front panel’s system diagram turns off.
In single side applications, the
transmitter should resume operation at
the desired operating level.
