• Code: 2-050
• Description: Multiple sheets of paper feeding at once.
• Causes: Engine board. 1. Solenoid malfunction. 2. Feed clutch armature does not engage the pick-up housing in the pick-up ass’y.
• Remedy: 1. If the solenoid does not work properly: 1-1. Measure the resistance of the feed clutch coil. If below 40 ohms (normal:55-60 ohm), replace. 1-2. Check Q4 C/E short, and replace as necessary. (If C and E are shorted, multiple sheets of paper feed when the printer powers on.) 1-3. Check if the solenoid spring returned to the original state. Replace if the return force is weak. 2. If the clutch works properly, but the armature does not engage the pick-up housing in the pick-up ass’y, bend the armature to pick up properly.

• Code: 3-010
• Description: FUSER ERROR message displayed on the monitor screen.
• Causes: 1. Fuser 2. Engine board. 1-1. Thermostat, AC wire, or heat lamp may be open. 1-2. Thermistor may be open.(Use DCU error code 60 and 62). 2-1. Abnormal heat lamp on/off 2-2. Malfunction of the overheat circuit
• Remedy: 1-1. Check thermostat, AC wire, and heat lamp. If the thermostat is open, check also R34, R47, and Q8. 1-2. If thermistor is open, check the wire. If the wire is good, check Q8. Q8 collector should be 0.2V, base 0.7V. 2-1. Check Q3 and its related parts in the order shown below. (Q3 on, and 0V and 24V respectively with lamp off. 1) Check Q3 C-E, B-E, B-C, and replace if shorted. If the voltage between B and E is below 0.7V, replace. 2) When lamp is on, if the base is 0V, check CPU pin 38. 3) If collector is 0V and lamp not on, check PC151, Q101, and parts. 2-2. Check the overheat circuit. When U5 pin 7 is below 0.5V, the overheat circuit should activate and the lamp turns off. In normal mode, pin 6 is approximately 2.6V, pin 5 is over 2.6V, and pin 7 is over 4V. If not, check all related parts.

• Code: 3-011
• Description: When printing, motor jams due to the defective fuser gear.
• Causes: 1. Fuser 2. Engine board. Fuser control temperature set too high. Overheat circuit not operating properly. PC151 or Q3 defective.
• Remedy: 1-1. Thermostat 1-2. Thermistor sensor 2-1. R57 and R58 = 3.3k and 1k, respectively. 2-2. Q3 C/E short. 2-3. Replace PC151 if pins 4 and 6 are shorted. 2-4. Replace Q101 if T1 and T2 are shorted. 2-5. Overheat circuit: Refer to solution 2-2 under Error Code 3-010.

• Code: 3-020
• Description: SCANNER ERROR message displayed on the LCD on or monitor screen.
• Causes: 1. Defective LSU 2. Defective Q5 or CPU
• Remedy: 1. Perform DCU diagnostic mode 05. If DCU error code 95 is displayed, replace LSU. If you cannot solve the problem after you replace LSU, follow the steps below: 2-1. When you press ENTER key in DCU mode ‘05’, if the LSU motor does not run, check Q5. Q5 collector and base are 0V and 0.7V respectively. If Q5 is normal, check CPU pin 40 and related parts. If the motor drives properly, and CPU pin 25 is not below 0.5V replace R26 and CPU. 2-2. When you press UP key in DCU mode ‘05’, if On and Off lamps do not turn on, check CPU pins 28 and 41, and related parts. Normally pin 28 is over 3.5V when high, and below 0.7V when low; pin 41 is below 0.7V when low. If transformer works normally, replace CPU.

• Code: 3-030
• Description: PAPER EMPTY message when paper is present in the cassette.
• Causes: 1. Paper sensor actuator 2. Engine board. 1. Paper sensor actuator deformed or broken. 2. Photo sensor OP2 on the engine board may be defective.
• Remedy: 1. Replace actuator. 2. CPU pin 49 should be over 3.5VDC when OP2 sensor is blocked, and below 0.7VDC when the sensor is not blocked. One end of R23 in the transmitter of OP2 should be 5VDC, and the other end 1.2VDC, each measured to GND. If the resistance is normal, check for short circuit of OP2 receiver. If OP2 is normal, replace CPU.

• Code: 3-031
• Description: When the cassette is empty, PAPER EMPTY message does not display.
• Causes: 1. Paper sensor actuator 2. Engine board. 1. Paper sensor actuator may be deformed or broken. 2. Malfunction of the photo sense circuit on the engine board.
• Remedy: Refer to Error Code 3-030.

• Code: 3-040
• Description: COVER OPEN message is displayed while the cover is closed.
• Causes: 1. Hook lever in the top cover 2. Engine board. 1. The hook lever may be damaged or deformed. 2. Malfunction of micro switch SW151 and its related parts on the engine board.
• Remedy: 1. If the hook lever is damaged or deformed, replace. 2. Check SW151 and related circuitry. - Check SMPS 24V output. - Check D4 anode when SW151 is pressed, D4 anode will be below 3.5V when SW151 is open. R38 and R39. - If D4 anode is over 3.5V, check CPU pin 48 for a short to GND. If not shorted, replace CPU.

• Code: 3-041
• Description: COVER OPEN message is not displayed when cover is open
• Causes: 1. Hook lever in the top cover 2. Engine board. 1. The hook lever may be damaged or deformed. 2. Malfunction of micro switch SW151 and its related parts on the engine board.
• Remedy: Refer to Error Code 3-040