HP 8550 Service Manual - Page 514

E710, E711 These are IPC (initialization) errors. E710 occurs when the IPC sync register for the copy module and the copy module-related accessories fail to go to one (1) within three seconds. E711 occurs when data has been written 10 times or more to the error register within 1.5 seconds during the communication between the copy module and copy module-related accessories. Cause Copy module Step 1 Reader 2 controller PCB, accessories (connected to the copy module) Checks Turn the copy module rear power switch off and then on; then, turn on the control panel power soft switch. Is the problem corrected? Replace the reader controller PCB. Is the problem corrected? Yes/No Action YES End. YES NO End. Refer to the Service Manual for the reader-unit accessory in question. E712 The error shown on the touch-screen display is in the ADF. See "ADF troubleshooting" on page 528. This error indicates that the IC for communication on the ADF side is faulty. This error occurs when the communication with the copy module has been interrupted for five seconds or more. Note E717 This error occurs when the copy module is started after disconnecting the copy data control without canceling the open circuit detection mechanism of the copy module. If this error has occurred, execute error clear and set COPIER > OPTION > INT-FACE > B-CLR in service mode to "0", and then disconnect the copy data controller. The copy data controller is not available for the LJ8550 MFP. 512 Chapter 7 - Troubleshooting EN