• Code: 120.02
• Description: Service fuser error Fuser pressure roll retract motor failure An error was detected at the fuser pressure rolls and motor.
• Remedy: 1 Check the fuser pressure roll retract motor. Is the above component properly connected? Go to step 2. Replace the connections. 2 Replace the fuser pressure roll retract motor. Go to “Fuser pressure roll retract motor removal”. Does the error remain? Go to step 3. Problem resolved 3 Check the fuser assembly. Is the above component properly connected? Go to step 2. Replace the connections. 4 Replace the fuser assembly. Go to “Fuser assembly removal”. Does the error remain? Go to step 3. Problem resolved 5 POR the machine. Does the error continue? Replace the lower engine PCBA. Go to “Lower engine PCBA removal”. Go to step 6. Problem resolved 6 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved

• Code: 121.01
• Description: Service fuser error Encoder pulse fail No change was detected on the speed of the belt for more than 1 second.
• Remedy: 1 Check the fuser assembly. Is the above component properly connected? Go to step 2. Replace the connections. 2 Replace the fuser assembly. Go to “Fuser assembly removal”. Does the error remain? Go to step 3. Problem resolved 3 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved

• Code: 121.03
• Description: Service fuser error Heat belt (center) disconnection error Open circuit is detected at the fuser heat belt.
• Remedy: 1 Check the fuser assembly. Is the above component properly connected? Go to step 2. Remove foreign particles, and replace the connections. 2 Replace the fuser assembly. Go to “Fuser assembly removal”. Does the error remain? Go to step 3. Problem resolved 3 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved

• Code: 121.04
• Description: Service fuser error Heat belt (center) overheat error Temperature in the heat belt has exceeded the limit.
• Remedy: 1 Check the fuser assembly. Is the above component properly connected? Go to step 2. Remove foreign particles, and replace the connections. 2 Replace the fuser assembly. Go to “Fuser assembly removal”. Does the error remain? Go to step 3. Problem resolved 3 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved

• Code: 121.05
• Description: Service fuser error Heat belt (rear) disconnection error Open circuit is detected at the fuser heat belt.
• Remedy: 1 Check the fuser assembly. Is the above component properly connected? Go to step 2. Remove foreign particles, and replace the connections. 2 Replace the fuser assembly. Go to “Fuser assembly removal”. Does the error remain? Go to step 3. Problem resolved 3 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved

• Code: 121.06
• Description: Service fuser error Heat belt (rear) overheat error Temperature in the heat belt has exceeded the limit.
• Remedy: 1 Check the heat roll. Is the heat roll free of any media or foreign particles? Go to step 2. Remove foreign particles, and replace the connections. 2 Check the fuser assembly. Is the above component properly connected? Go to step 3. Replace the connections. 3 Replace the fuser assembly. Go to “Fuser assembly removal”. Does the error remain? Go to step 4. Problem resolved 4 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved

• Code: 121.07
• Description: Service fuser error Heat belt (center) temperature increase failure The temperature is late in reaching a specified temperature within the specified time.
• Remedy: 1 Check the fuser assembly. Is the above component properly connected? Go to step 2. Remove foreign particles, and replace the connections. 2 Replace the fuser assembly. Go to “Fuser assembly removal”. Does the error remain? Go to step 3. Problem resolved 3 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved

• Code: 121.08
• Description: Service fuser error Heat belt (rear) temperature increase failure The temperature is late in reaching a specified temperature within the specified time.
• Remedy: 1 Check the fuser assembly. Is the above component properly connected? Go to step 2. Remove foreign particles, and replace the connections. 2 Replace the fuser assembly. Go to “Fuser assembly removal”. Does the error remain? Go to step 4. Problem resolved 3 POR the machine. Does the error continue? Replace the upper printer engine PCBA. Go to “Upper printer engine PCBA removal”. Problem resolved