• Code: 121.26
• Description: Failed to reach temperature during warm up.
• Remedy: Step 1: 1. Restore the engine settings to their defaults: Diagnostics Menu >Printer Setup >Defaults 2. Restore the EP setup settings to their defaults: Diagnostics Menu >EP Setup >Defaults Does the problem remain? Yes: Go to step 2. No: The problem is solved.
  Step 2: • Check the fuser cables JTHERM1 and JEXIT for proper connection to the controller board. • Check the cable PCN5 for proper connection to the power supply. Are they properly connected? Yes: Go to step 3. No: Reseat the cables.
  Step 4: 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of the power supply. 4. Check for approximate correct resistance on the fuser cable: - 220V fuser - 43 ohms - 110V fuser - 10 ohms - 100V fuser - 8 ohms Is the resistance equal to any of the above values? Yes: Perform an LVPS service check. No: Replace the fuser.
  Step 5: Check the fuser rollers, belts and gears for damage and debris. Are they free of damage and debris? Yes: Perform a cooling fan service check and LVPS service check. No: Replace the fuser.

• Code: 121.28
• Description: Failed to reach EP warm up temperature in time.
• Remedy: Step 1: 1. Restore the engine settings to their defaults: Diagnostics Menu >Printer Setup >Defaults 2. Restore the EP setup settings to their defaults: Diagnostics Menu >EP Setup >Defaults Does the problem remain? Yes: Go to step 2. No: The problem is solved.
  Step 2: • Check the fuser cables JTHERM1 and JEXIT for proper connection to the controller board. • Check the cable PCN5 for proper connection to the power supply. Are they properly connected? Yes: Go to step 3. No: Reseat the cables.
  Step 4: 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of the power supply. 4. Check for approximate correct resistance on the fuser cable: - 220V fuser - 43 ohms - 110V fuser - 10 ohms - 100V fuser - 8 ohms Is the resistance equal to any of the above values? Yes: Perform an LVPS service check. No: Replace the fuser.
  Step 5: Check the fuser rollers, belts and gears for damage and debris. Are they free of damage and debris? Yes: Perform a cooling fan service check and LVPS service check. No: Replace the fuser.

• Code: 121.29
• Description: Fuser failed to reach pre-heat temperature for motor start during warm up.
• Remedy: Step 1: 1. Restore the engine settings to their defaults: Diagnostics Menu >Printer Setup >Defaults 2. Restore the EP setup settings to their defaults: Diagnostics Menu >EP Setup >Defaults Does the problem remain? Yes: Go to step 2. No: The problem is solved.
  Step 2: • Check the fuser cables JTHERM1 and JEXIT for proper connection to the controller board. • Check the cable PCN5 for proper connection to the power supply. Are they properly connected? Yes: Go to step 3. No: Reseat the cables.
  Step 4: 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of the power supply. 4. Check for approximate correct resistance on the fuser cable: - 220V fuser - 43 ohms - 110V fuser - 10 ohms - 100V fuser - 8 ohms Is the resistance equal to any of the above values? Yes: Perform an LVPS service check. No: Replace the fuser.
  Step 5: Check the fuser rollers, belts and gears for damage and debris. Are they free of damage and debris? Yes: Perform a cooling fan service check and LVPS service check. No: Replace the fuser.

• Code: 121.30
• Description: Fuser failed to reach printing temperature by the time a page reached the fuser.
• Remedy: Step 1: 1. Restore the engine settings to their defaults: Diagnostics Menu >Printer Setup >Defaults 2. Restore the EP setup settings to their defaults: Diagnostics Menu >EP Setup >Defaults Does the problem remain? Yes: Go to step 2. No: The problem is solved.
  Step 2: • Check the fuser cables JTHERM1 and JEXIT for proper connection to the controller board. • Check the cable PCN5 for proper connection to the power supply. Are they properly connected? Yes: Go to step 3. No: Reseat the cables.
  Step 4: 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of the power supply. 4. Check for approximate correct resistance on the fuser cable: - 220V fuser - 43 ohms - 110V fuser - 10 ohms - 100V fuser - 8 ohms Is the resistance equal to any of the above values? Yes: Perform an LVPS service check. No: Replace the fuser.
  Step 5: Check the fuser rollers, belts and gears for damage and debris. Are they free of damage and debris? Yes: Perform a cooling fan service check and LVPS service check. No: Replace the fuser.

• Code: 121.31
• Description: Fuser is too hot. Global overtemp check.
• Remedy: Step 1: 1. Restore the engine settings to their defaults: Diagnostics Menu >Printer Setup >Defaults 2. Restore the EP setup settings to their defaults: Diagnostics Menu >EP Setup >Defaults Does the problem remain? Yes: Go to step 2. No: The problem is solved.
  Step 2: • Check the fuser cables JTHERM1 and JEXIT for proper connection to the controller board. • Check the cable PCN5 for proper connection to the power supply. Are they properly connected? Yes: Go to step 3. No: Reseat the cables.
  Step 4: 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of the power supply. 4. Check for approximate correct resistance on the fuser cable: - 220V fuser - 43 ohms - 110V fuser - 10 ohms - 100V fuser - 8 ohms Is the resistance equal to any of the above values? Yes: Perform an LVPS service check. No: Replace the fuser.
  Step 5: Check the fuser rollers, belts and gears for damage and debris. Are they free of damage and debris? Yes: Perform a cooling fan service check and LVPS service check. No: Replace the fuser.

• Code: 121.32
• Description: Open fuser main thermistor.
• Remedy: Step 1: 1. Restore the engine settings to their defaults: Diagnostics Menu >Printer Setup >Defaults 2. Restore the EP setup settings to their defaults: Diagnostics Menu >EP Setup >Defaults Does the problem remain? Yes: Go to step 2. No: The problem is solved.
  Step 2: • Check the fuser cables JTHERM1 and JEXIT for proper connection to the controller board. • Check the cable PCN5 for proper connection to the power supply. Are they properly connected? Yes: Go to step 3. No: Reseat the cables.
  Step 4: 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of the power supply. 4. Check for approximate correct resistance on the fuser cable: - 220V fuser - 43 ohms - 110V fuser - 10 ohms - 100V fuser - 8 ohms Is the resistance equal to any of the above values? Yes: Perform an LVPS service check. No: Replace the fuser.
  Step 5: Check the fuser rollers, belts and gears for damage and debris. Are they free of damage and debris? Yes: Perform a cooling fan service check and LVPS service check. No: Replace the fuser.

• Code: 121.33
• Description: Open fuser edge thermistor.
• Remedy: Step 1: 1. Restore the engine settings to their defaults: Diagnostics Menu >Printer Setup >Defaults 2. Restore the EP setup settings to their defaults: Diagnostics Menu >EP Setup >Defaults Does the problem remain? Yes: Go to step 2. No: The problem is solved.
  Step 2: • Check the fuser cables JTHERM1 and JEXIT for proper connection to the controller board. • Check the cable PCN5 for proper connection to the power supply. Are they properly connected? Yes: Go to step 3. No: Reseat the cables.
  Step 4: 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of the power supply. 4. Check for approximate correct resistance on the fuser cable: - 220V fuser - 43 ohms - 110V fuser - 10 ohms - 100V fuser - 8 ohms Is the resistance equal to any of the above values? Yes: Perform an LVPS service check. No: Replace the fuser.
  Step 5: Check the fuser rollers, belts and gears for damage and debris. Are they free of damage and debris? Yes: Perform a cooling fan service check and LVPS service check. No: Replace the fuser.

• Code: 121.34
• Description: Open fuser backup roll thermistor.
• Remedy: Step 1: 1. Restore the engine settings to their defaults: Diagnostics Menu >Printer Setup >Defaults 2. Restore the EP setup settings to their defaults: Diagnostics Menu >EP Setup >Defaults Does the problem remain? Yes: Go to step 2. No: The problem is solved.
  Step 2: • Check the fuser cables JTHERM1 and JEXIT for proper connection to the controller board. • Check the cable PCN5 for proper connection to the power supply. Are they properly connected? Yes: Go to step 3. No: Reseat the cables.
  Step 4: 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of the power supply. 4. Check for approximate correct resistance on the fuser cable: - 220V fuser - 43 ohms - 110V fuser - 10 ohms - 100V fuser - 8 ohms Is the resistance equal to any of the above values? Yes: Perform an LVPS service check. No: Replace the fuser.
  Step 5: Check the fuser rollers, belts and gears for damage and debris. Are they free of damage and debris? Yes: Perform a cooling fan service check and LVPS service check. No: Replace the fuser.