HP 8550 Service Manual - Page 510

E240 One of the following has occurred: 1 The communication between the dc controller PCB and the reader controller PCB is faulty. This error occurs when the DPPRDY signal is sent for less than 0.25 seconds from the reader controller to the dc controller PCB after power-on. 2 The communication between the dc controller PCB and the formatter or between the reader controller PCB and the formatter is faulty. This error occurs when the signals between the formatter and the dc controller PCB or between the formatter and the reader controller PCB cannot be exchanged for a specific time after power-on. Cause Step Interface cable 1 Video interface PCB, reader controller PCB PS/PCL board 2 dc controller PCB Checks Yes/No Action Is the interface cable used to connect the copy module and the printer unit connected securely? Further, are the copy module power cord and the printer unit power cord connected securely? NO YES Make the connections secure, and turn on the copy module. Replace the video interface PCB or the reader controller PCB. Turn the unit off and remove the NO formatter, and turn on the printer YES unit and copy module as one (as a copier). Is E240 indicated? Replace the formatter. Replace the dc controller PCB. E243 The communication between the control panel CPU PCB and the reader controller PCB is not possible 20 seconds or more after power-on. Cause Connectors Step 1 Control panel 2 CPU PCB, reader controller PCB Checks Yes/No Action Are connector J901 on the control NO panel CPU PCB and connector J1608 on the reader controller PCB connected securely? Connect the connectors securely. Replace the control panel CPU YES PCB. Is the problem corrected? NO End. Replace the reader controller PCB. 508 Chapter 7 - Troubleshooting EN