7 Repair
7.8 Replacement of Computer Unit
144 3HNA009834-001 en Rev.06 Product Manual, Control Cabinet IRC5P
WARNING! Make sure that the mains switch is ‘off’ and locked in ‘off’ position
before continuing. Also make sure that possible other connected systems are ‘off’.
2. Open the controller front door and locate the computer unit on the inside of the
door (73/1).
3. Remove computer unit top cover (73/2) by loosening cover attachment screws
(73/3).
4. Disconnect all connectors (73/7) from the computer unit. Note position of
connectors to simplify re-connection.
5. Remove Compact Flash card from computer unit (73/9). For description, see
’Replacement of Compact Flash’ on page 151.
6. Lift the complete computer unit up and out.
7. If further activities are to be performed, such as replacing a PCI card, place the
computer unit on a clean work bench and continue to the relevant procedure.
Important: When placing the computer unit on a table etc., pay attention to the
attachment hooks to avoid bending the hooks or scratching the table.
Refitting The procedure describes how to re-install the computer unit.
WARNING! Refitting activities must only be performed when controller is switched
‘off’ and all safety precautions under ‘Removal’ have been read.
1. Lift the computer unit into position.
2. Guide the attachment hooks (73/4) of the computer unit into the slots in the
controller door.
3. Lower the unit into position.
4. Re-install Compact Flash card. For description, see ’Replacement of Compact
Flash’ on page 151.
5. Reconnect all connectors to the computer unit.
6. Re-install top cover.
7. Close controller front door.
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