User Manual

DRAFT RF Front End System Integration Manual
044-05082 Rev. A
5-3
March 2001
5-6 Field Replaceable Parts and Modules
The following parts and modules can be replaced in the field on site by a qualified technician with
experience maintaining RF power amplifiers and similar equipment:
• Transmit Modules
• Cooling Fans
5-6.1 Replacing a Transmit Module
The To replace a power amplifier module, proceed as follows:
1. Turn off the 220 VAC circuit breaker that feeds the MHU
2. Loosen the four screws that secure the amplifier module to the MHU chassis.
3. Carefully slide the amplifier away from the common box.
4. Install the replacement amplifier in reverse order.
C
AUTION
To avoid damage to the module and blindmate connector, care must be taken as not
to drop the module when removing it from the MHU support frame. The amplifier
weighs approximately 10 lbs.
5-6.2 Replacing the Cooling Fans
5-6.2.1 To replace a front cooling fan, proceed as follows:
1. Turn off the 220 VAC power to the MHU.
2. Unplug the power line to the fan.
3. Remove the six screws holding the fan to its chassis (you may be required to remove the
MHU from the mounting pole to gain access to the fan.
4. Pull fan out.
5. Install the replacement fan in reverse order of steps 1, 2, 3 and 4 above.