Code Description
C1 Front door open
C2 Exit door
C3 Cassette cover
C4 LCT cover
C5 Sorter open/not latched to machine
C6 ADF cover
C7 Right side cover
E101 Exposure lamp on too long
E103 Frequency problem
E120, 121 Scan home problem
E124 Scan drive problem
E140-143 Lens home, or fuse 303 on DC board
E144, 145 Mirror sensor, fuse 303 on DC board
E191 Image density sensor problem
E302 Charge roller or HVT problem
E346 Bias loss
E351 Image density sensor problem
E352 TD sensor error
E353, 354 Vsp problem
E355, 356 Toner density sensor problem
E405 Transfer belt or charge roller drive
E440 Main drive
E442 Drum charge thermistor
E501 Upper lift motor
E502 lower lift motor
E503 1st tray motor
E504 2nd tray motor
E505 3rd tray motor
E506 Tray main motor drive problem
E507 LCT lift motor
E522-525 Jogger sensor
E541 Fuser thermistor
E542 Fuser temperature too low
E543 Fuser temperature too high
E544 Fuser temperature too high
E547 Fuser lamp won't shut off
E548 Fuser temperature too high or too low
E620 Communication problem between main board and ARDF
E621 Communication problem between main board and sorter
E623 Communication problem between main board and paper trays
E720 Sorter stapler timing roller sensor
E721 Sorter stapler bin lift sensor
E722 Sorter stapler jogger sensor
E723 Sorter stapler grip sensor
E724 Sorter stapler error
E900, 901 Copy counter
U2 Key counter
U6 Fuser unit not installed properly
U7 Duplex unit