Samsung ML-6050 Service Manual page 68

Troubleshooting
Error code 3-040/3-041
Fault
Cover Open
Description
• The ERROR lamp is on even when the printer cover is closed.
• The ERROR lamp does not come on even when the printer cover is open.
Check
1. Hook lever in the top cover (Refer to 2 on page 6-4.)
2. Engine board
3. Actuator-cover open (Refer to 48 49 on page 6-6.)
Cause
1. The hook lever may be defective.
2. Malfunction of the circuit containing the micro switch SW151 and its related parts on the engine board.
3. Defective actuator-cover open.
Solution
1. Replace the hook lever, if defective.
2. Check SW151 and its related parts :
2-1. Check SMPS 24V output.
2-2. Check D4 anode when SW151 is pressed. D4 anode will be below 3.5V when SW151 is open.
Check for R38 and R39, and replace if defective.
2-3. If D4 anode is over 3.5V, check if CPU pin 48 is short. If not, replace CPU.
3. Replace the defective actuator.
Remark
Others
5-36
Model ML-xxxx
Samsung Electronics