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You need service manual book
If lit steadily, paper feed section cover is open or
manual feed unit not installed properly. If flashing, developer seal
still installed, or toner density sensor/main board problem.
Sub code EU: undertoned. May be toner density sensor
problem or developer unit problem. Sub code EL: Over toned. May be
toner density sensor problem or developer unit problem.
Sub code 0: Fuser thermistor.
Sub code 0: Fuser temperature too high.
Sub code 0: Fuser temperature too low.
Scan problem. Sub code is 0, but there is no more
detail. Could be no scan drive; scan did not leave home; scan did not
return home; scan overloaded; mirror motor problem; scan cable came off.
Scan return problem. Sub code 0. Approximately same causes as L1
Sub code 1: Main drive problem. Sensor, gear, motor.
Sub code 2: Lens drive, motor, sensor.
Sub code 1 Power frequency varies by more than 5 % or for more than 5 sec. Sub code 3: AE sensor problem.
Key counter not installed.
Document feeder problem.
Sub code 1: Main board EEPROM problem. Sub code 4: Memory problem.
Sub code 5: high temperature at exposure glass when using document feeder