Fuser Error - Samsung SCX-4200 Series Service Manual

Troubleshooting
6.4 Printer Faults – Causes and Solutions

6.4.1 Fuser Error

• Description
A message "Open Heat Error/Over heat/Heating Error' is displayed in the LCD panel.
Check and Cause
1. Thermostat, fuser power cable or heat lamp is
open circuit.
2. Thermistor is open circuit.
3. Heat lamp ON/OFF test
4. Drive gear melted
6.4.2 LSU Error
• Description
A message "LSU Error" is displayed in the LCD panel.
Check and Cause
1. LSU cable or connector faulty.
2. LSU motor is faulty.
3. Check the HSYNC signal.
Service Manual
6-14
Solution
1. Replace the whole fuser assembly if the
thermostat is open circuit.
2. Replace the whole fuser assembly if the ther-
mistor sensor is faulty.
3. Replace the fuser.
Solution
Use TECH mode to test the LSU
- Replace the LSU
- Replace a main board if the same error persists after
replacing a LSU.
Samsung Electronics