Replacing Assemblies; Transceiver Board And Power Supply Assemblies - GE MDS 4790M Installation And Operation Manual

7.3 Replacing Assemblies

Component-level repair of a transceiver board in the field is not recommended
due to the complex nature of the circuitry and the use of surface-mount
technology throughout the radio. Malfunctioning assemblies should be
returned to the factory (or authorised service centre) for repair or replacement.
One approach to field-level servicing is to have spare modules available for the
four easily replaced assemblies—the Main Transceiver Board, Power Supply,
Front Panel, and Internal Duplexer. In this way, a defective assembly can be
quickly removed and replaced with a working unit. The following instructions
describe the removal and installation of these assemblies.
Primary power to the radio must be disconnected before removing or
CAUTION
installing transceiver board or power supply assemblies.
POSSIBLE
EQUIPMENT
DAMAGE

Transceiver Board and Power Supply Assemblies

To remove either of these assemblies, loosen the two captive thumbscrews at
each side of the module, and slide the unit straight out as shown in Figure 30.
(There are no cables to disconnect, as the modules are fitted with in-line
connectors.)
To re-install these modules, make sure that the slides are properly aligned with
the guide slots on the chassis, and push straight in. Tighten the thumbscrews to
secure the assembly.
Invisible place holder
Figure 30. Main Transceiver and Power Supply Removal
MDS 05-3628A01, Rev. B MDS 4790M (MPT 1411) I/O Guide 67