• Code: 3423-121.24
• Description: Fuser warm-up trouble
  Fuser never reached detection temperature
• Causes: • Controller board (CTLB) • Power supply unit (PU)
• Remedy: 1 Check the fuser cables JTHERM1 and JEXIT for proper connection to the CTLB. Reseat the cables if any abnormality is found. 2 Check the cable PCN5 for proper connection to power supply. Reseat the cables if any abnormality is found. 3 Check the cables JTHERM1, JEXIT and PCN5 for damage. Replace the fuser unit if any abnormality is found. 4 Check for resistance on the fuser cable. 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of PU. 4. Check for approximate correct resistance on the fuser cable: 220V/43Om, 110V/10U, 100V/8Om

• Code: 3423-121.25
• Description: Fuser warm-up trouble
  After line voltage detection, control did not roll over to steady state control in time.
• Causes: • Controller board (CTLB) • Power supply unit (PU)
• Remedy: 1 Check the fuser cables JTHERM1 and JEXIT for proper connection to the CTLB. Reseat the cables if any abnormality is found. 2 Check the cable PCN5 for proper connection to power supply. Reseat the cables if any abnormality is found. 3 Check the cables JTHERM1, JEXIT and PCN5 for damage. Replace the fuser unit if any abnormality is found. 4 Check for resistance on the fuser cable. 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of PU. 4. Check for approximate correct resistance on the fuser cable: 220V/43Om, 110V/10U, 100V/8Om

• Code: 3423-121.26
• Description: Fuser warm-up trouble
  Failed to reach temperature during warm up.
• Causes: • Controller board (CTLB) • Power supply unit (PU)
• Remedy: 1 Check the fuser cables JTHERM1 and JEXIT for proper connection to the CTLB. Reseat the cables if any abnormality is found. 2 Check the cable PCN5 for proper connection to power supply. Reseat the cables if any abnormality is found. 3 Check the cables JTHERM1, JEXIT and PCN5 for damage. Replace the fuser unit if any abnormality is found. 4 Check for resistance on the fuser cable. 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of PU. 4. Check for approximate correct resistance on the fuser cable: 220V/43Om, 110V/10U, 100V/8Om

• Code: 3423-121.28
• Description: Fuser warm-up trouble
  Failed to reach EP warm up temperature in time.
• Causes: • Controller board (CTLB) • Power supply unit (PU)
• Remedy: 1 Check the fuser cables JTHERM1 and JEXIT for proper connection to the CTLB. Reseat the cables if any abnormality is found. 2 Check the cable PCN5 for proper connection to power supply. Reseat the cables if any abnormality is found. 3 Check the cables JTHERM1, JEXIT and PCN5 for damage. Replace the fuser unit if any abnormality is found. 4 Check for resistance on the fuser cable. 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of PU. 4. Check for approximate correct resistance on the fuser cable: 220V/43Om, 110V/10U, 100V/8Om

• Code: 3423-121.29
• Description: Fuser warm-up trouble
  Fuser failed to reach pre-heat temperature for motor start during warm up.
• Causes: • Controller board (CTLB) • Power supply unit (PU)
• Remedy: 1 Check the fuser cables JTHERM1 and JEXIT for proper connection to the CTLB. Reseat the cables if any abnormality is found. 2 Check the cable PCN5 for proper connection to power supply. Reseat the cables if any abnormality is found. 3 Check the cables JTHERM1, JEXIT and PCN5 for damage. Replace the fuser unit if any abnormality is found. 4 Check for resistance on the fuser cable. 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of PU. 4. Check for approximate correct resistance on the fuser cable: 220V/43Om, 110V/10U, 100V/8Om

• Code: 3423-121.30
• Description: Fuser warm-up trouble
  Fuser failed to reach printing temperature by the time a page reached the fuser.
• Causes: • Controller board (CTLB) • Power supply unit (PU)
• Remedy: 1 Check the fuser cables JTHERM1 and JEXIT for proper connection to the CTLB. Reseat the cables if any abnormality is found. 2 Check the cable PCN5 for proper connection to power supply. Reseat the cables if any abnormality is found. 3 Check the cables JTHERM1, JEXIT and PCN5 for damage. Replace the fuser unit if any abnormality is found. 4 Check for resistance on the fuser cable. 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of PU. 4. Check for approximate correct resistance on the fuser cable: 220V/43Om, 110V/10U, 100V/8Om

• Code: 3423-121.31
• Description: Fuser warm-up trouble
  Fuser is too hot. Global overtemp check.
• Causes: • Controller board (CTLB) • Power supply unit (PU)
• Remedy: 1 Check the fuser cables JTHERM1 and JEXIT for proper connection to the CTLB. Reseat the cables if any abnormality is found. 2 Check the cable PCN5 for proper connection to power supply. Reseat the cables if any abnormality is found. 3 Check the cables JTHERM1, JEXIT and PCN5 for damage. Replace the fuser unit if any abnormality is found. 4 Check for resistance on the fuser cable. 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of PU. 4. Check for approximate correct resistance on the fuser cable: 220V/43Om, 110V/10U, 100V/8Om

• Code: 3423-121.32
• Description: Fuser warm-up trouble
  Open fuser main thermistor.
• Causes: • Controller board (CTLB) • Power supply unit (PU)
• Remedy: 1 Check the fuser cables JTHERM1 and JEXIT for proper connection to the CTLB. Reseat the cables if any abnormality is found. 2 Check the cable PCN5 for proper connection to power supply. Reseat the cables if any abnormality is found. 3 Check the cables JTHERM1, JEXIT and PCN5 for damage. Replace the fuser unit if any abnormality is found. 4 Check for resistance on the fuser cable. 1. Turn off the printer. 2. Remove the rear door and cover. 3. Disconnect the fuser cable connected to PCN5 of PU. 4. Check for approximate correct resistance on the fuser cable: 220V/43Om, 110V/10U, 100V/8Om