Replacement Of The Main Processor Board; Front Panel Assembly - GE MiCOM P40 Agile Technical Manual

P44x/EN MT/Hb6
(MT) 10-10
1.3.2.1

Replacement of the main processor board

The main processor board is located in the front panel, not within the case as with all the
other PCBs.
Place the front panel with the user interface face-down and remove the six screws from the
metallic screen, as shown in Figure 3. Remove the metal plate.
There are two further screws, one each side of the rear of the battery compartment
moulding, that hold the main processor PCB in position. Remove these screws.
The user interface keypad is connected to the main processor board via a flex-strip ribbon
cable. Carefully disconnect the ribbon cable at the PCB-mounted connector as it could
easily be damaged by excessive twisting.
Figure 3 - Front Panel Assembly
The front panel can then be re-assembled with a replacement PCB using the reverse
procedure, ensuring that the ribbon cable is reconnected to the main processor board and all
eight screws are re-fitted.
Refit the front panel using the reverse procedure to that given in section 1.3.2. After refitting
and closing the access covers on case sizes 60TE, press on the location of the hinge-
assistance T-pieces so that they click back into the front panel moulding.
After replacement of the main processor board, all the settings required for the application
will need to be re-entered. It is therefore useful to have an electronic copy of the application-
specific settings is available on disk. Although this is not essential, it can reduce the time
taken to re-enter the settings and hence the time the protection is out of service.
Once the relay has been reassembled after repair, it should be recommissioned in
accordance with the instructions in sections 1 to 7 (inclusive) of this document.
Maintenance
MiCOM P40 Agile P442, P444