Description: Main motor error
The main motor won’t revolve, or will revolve too slow.
Causes: • Error with CPU and gate arrays of either the engine or main controller • The motor brake circuit is activated because of an abnormal torque of the motor. • Overheating protection circuit is activated because of the overheating main motor IC • Defective engine gate array (U2) • Defective main motor driving circuit (transistor arrays, etc.) on the engine board • Defective buffer IC for FG signal detection on the engine board
Code: E2
Description: Laser scanner motor error
The revolution of the polygon motor does not reach the predetermined revolution.ner mo
Causes: • Defective scanner motor (e.g., at its axle holder) • Connection error between polygon motor and liaison connector, or liaison connector and KP- 570 (YC3) • Defective engine gate array (U2/U6) • Defective scanner motor driver transistor
Code: E3
Description: Laser beam detection error
Beam detection is failed. The photo detector failed to detect laser beam.lutio
Causes: • Laser diode does not emit. • Connectionerror between KP-578 (YC2) and KP-579 (YC101 [within scanner]), KP-578 (YC1) and KP-570 (YC2), KP-578 (YC1) and KP-564 (YC3), KP-570 (YC1) and KP-564 (YC3), or KP-572 (YC1) and KP-564 (YC3) • Defective or contaminated pin-photo IC • Malfunctioning interlock detection circuit on the ending board • Defective engine gate array U2
Code: E4
Description: Fuser heater error
The fuser heater does not turn on. [E4 is indicated immediately after power is on.] The fuser heater does not turn on. [E4 is indicated several minutes after power is on.]
Causes: • Connection error between the engine board and the fuser unit • Defective engine gate array U2 • Defective comparators on the engine board • Defective thermistor (cut) • Connection error between the fuser board and the thermistor • Connection error between the engine board and the low-voltage power supply • Defective engine gate array U2 • Defective transistors, logic gate ICs, comparators, etc. on the engine board • Defective thermistor (showing high resistance even at heating)
Code: E5
Description: Eraser error
The eraser does not turn on.
Causes: • Connector error between CON1 board and the drum liaison board • Defective connector between the drum liaison board and the drum board • Defective transistors and logic gate ICs in the eraser controller circuit on the engine board • Connection error between drum unit board and eraser lamp • Broken eraser lamp
Code: E8
Description: Fuser unit life fuse error
The fuser unit life fuse won’t blow out.
Causes: • Defective gate array U6 • Defective fuse cut circuit on the engine board