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HP LJ M3027, 3035 removing the engine control unit

Author: Metrofuser Tech Support Reference Number: AA-05495 Views: 5398 Created: 06-26-2012 05:31 pm Last Updated: 06-26-2012 05:31 pm 0 Rating/ Voters

1  Remove the following components

     All of the covers and the ADF/ scanner assembly

     Fax  Accessory

     Disk drive



     Right side fan

2  Disconnect  ten cables (callout 1) from the ECU

3  Remove two screws ( callout 2- one from the right side riser and one from the ECU plate )

4   Remove five screws (callout 3) at the back of the device.

5   Remove three screws ( callout 4 ) from the right side riser and then lift the riser off the device.

      Also two screws (callout 5) from the ECU plate.

6   Disconnect two sensor cables (callout 6) and the fuser power cable (callout  7)

7    Unplug the laser scanner ribbon cable ( callout 8 ) from the laser scanner and disconnect one inline connector

       ( callout  9) then, unwind the front door microswitch cable from the cable from the cable guides and then remove the

        microswitch (callout 10) from its housing.

Reinstallation tip       

  Upon reinstallation ,  replace the microswitch in its housing and then route the cable as shown.

8   Lift up the ECU slightly and rotate the top of the  ECU away from the device.  After it is rotated disconnect one ribbon cable (callout 11) from the ECU.

9  Lift the ECU off of the device.