HP 8550 Service Manual - Page 513

Note E545, E546 The error shown on the touch-screen display is in the output device. Output devices are not supported on the LJ8550 MFP. This error indicates that the bin flapper 1 (for E545) or bin flapper 2 (for E546) of the sorter-H1 is faulty. These errors occur when the bin flapper solenoid sensor (PI12) does not detect solenoid operation even when the solenoid (SL3 for E545 or SL4 for E546) is driven during initialization or face-down delivery. This error can also occur when the bin flapper sensor remains on even when the solenoid has stopped operation. E677, E678, E679 E677 indicates that an error has occurred during the initial communication between the ACC controller PCB and an accessory. The error occurs when the ACC controller PCB and the accessory are not ready for communication within four seconds (possibly due to a problem in the power supply), or when an initial communication error with each accessory has occurred. E678 indicates that the communication between the ACC controller PCB and an accessory has been interrupted. The error occurs when the accessory is turned off in the middle of communication, or when the cable of the accessory has been disconnected in the middle of communication. E679 indicates that an error has occurred in the protocol used for communication between the ACC controller PCB and an accessory. This error occurs when the read/write/parity check of data is faulty, and communication does not end within a specific time. Cause Accessories power, accessories Step 1 Checks Yes/No Action Are the power cables of the NO accessories and the YES communication cable to the printer unit connected securely? Turn the power off and then on. Replace the ACC controller PCB. EN Copy module troubleshooting 511