To replace the main processor board:
1.
Remove front panel.
2. Place the front panel with the user interface face down and remove the six screws from the metallic screen,
as shown in the figure below. Remove the metal plate.
3. Remove the two screws either side of the rear of the battery compartment recess. These are the screws
that hold the main processor board in position.
4. Carefully disconnect the ribbon cable. Take care as this could easily be damaged by excessive twisting.
5. Replace the main processor board
6. Reassemble the front panel using the reverse procedure. Make sure the ribbon cable is reconnected to the
main processor board and that all eight screws are refitted.
7. Refit the front panel.
8. Refit and close the access covers then press the hinge assistance T-pieces so they click back into the front
panel moulding.
9. Once the unit has been reassembled, carry out the standard commissioning procedure as defined in the
Commissioning chapter.
Note:
After replacing the main processor board, all the settings required for the application need to be re-entered. This may be done
either manually or by downloading a settings file.
Figure 208: Front panel assembly
2.5.2 REPLACEMENT OF COMMUNICATIONS BOARDS
Most products will have at least one communications board of some sort fitted. There are several different boards
av
ailable offering various functionality, depending on the application. Some products may even be fitted two
boards of different types.
To replace a faulty communications board:
1. Remove front panel.
2. Disconnect all connections at the rear.
3. The board is secured in the relay case by two screws, one at the top and another at the bottom. Remove
these screws carefully as they are not captive in the rear panel.
4. Gently pull the communications board forward and out of the case.
Chapter 21 - Maintenance and Troubleshooting P54A/B/C/E
494 P54xMED-TM-EN-1
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