User Manual

MCA9129-90MCA9129-90-A Installation & Service Manual

044-05060 Rev. C 5-7 July 2001November 2002

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:

1. MCA9129-90

MCA9129-90-A Power Amplifier Modules

2. Cooling Fans

5-6.1 MCA9129-90MCA9129-90-A Power Amplifier Module

To replace a power amplifier module, proceed as follows:

1. Set ON/OFF/RESET switch on the front panel of the amplifier module to OFF.

2. Loosen two screws that secure amplifier module to subrack.

CAUTION

When removing the amplifier from the subrack, it is very important to support the am-

plifier such that the rear of the module does not suddenly drop when the guide rail

disengages from the track. A drop such as this could damage the rear multipin con-

nector.

3. With steady even pressure, use handle on front of amplifier to pull module out of subrack.

5-6.2 Cooling Fans

To replace a cooling fan, proceed as follows:

1. Remove amplifier module from subrack; see paragraph 5-6.1 preceding.

2. Pull out snap fasteners that secure fan to amplifier module. Disconnect fan power connector

from amplifier module.

3. Install replacement in reverse order of steps 1 and 2 above.