Remedy: 1 Turn the printer ON and notice how much time elapses before the error occurs. Does the error occur soon after the power is turned ON? Replace the Fuser Assembly. Go to “Fuser Assembly”.
Code: U4-2
Display: “Fuser Failure\ Press i”
Description: Fuser Low Temp U4-2: Fuser Fail/Power Off
Remedy: 1 Turn the printer ON and notice how much time elapses before the error occurs. Does the error occur soon after the power is turned ON? Replace the Fuser Assembly. Go to “Fuser Assembly”.
Code: U4-3
Display: “Fuser Failure\ Press i”
Description: Fuser Overheat in Stand-by U4-3: Fuser Fail/Power Off
Remedy: 1 Turn the printer ON and notice how much time elapses before the error occurs. Does the error occur soon after the power is turned ON? Replace the Fuser Assembly. Go to “Fuser Assembly”.
Code: U4-4
Display: “Fuser Failure\Press i”
Description: Fuser Fails at warm-up U4-4: Fuser Fail/ Power Off
Remedy: 1 Turn the printer ON and notice how much time elapses before the error occurs. Does the error occur soon after the power is turned ON? Replace the Fuser Assembly. Go to “Fuser Assembly”.
Code: U4-5
Display: “Fuser Failure\Press i”
Description: Fuser Thermistor Failure U4-5: Fuser Fail/ Power Off
Remedy: 1 Turn the printer ON and notice how much time elapses before the error occurs. Does the error occur soon after the power is turned ON? Replace the Fuser Assembly. Go to “Fuser Assembly”.
Code: U5
Display: “Fan Failure\ Power Off Now\ Press i”
Description: U5: Fan Fail/ Power Off
Causes: • Main Fan • Sub Fan • LVPS • HVPS/Engine Logic Board
Remedy: 1 Turn the power ON. Does the Main Fan rotate? Go to step 2. Go to step 3. 2 Does the Sub Fan rotate when the power is turned ON? Go to step 3. Go to step 9. 3 Enter Service Diagnostics, and from the Motors/Fan Test menu select the Fan Motors High Speed test. Does the Main Fan rotate at high-speed? Go to step 4. Go to step 5. 4 Enter Service Diagnostics, and from the Motors/Fan Test menu select the Fan Motors High Speed test. Does the Sub Fan rotate at high-speed? Replace the HVPS/Engine Logic Board . Go to step 9. 5 Measure the voltage across P/J24-18 <=> P/J24-17 on HVPS/Main Logic board. Does the voltage measure 24 VDC? (12 VDC at low-speed) Go to step 6. Replace the LVPS then go to step 8. 6 Measure the voltage across P/J24-17 <=> P/J24-16. Does the voltage measure 0.82 VDC or higher? Replace the Main Fan then go to step 7. Replace the HVPS/Engine Logic Board . 7 Turn the power ON. Does the fan error occur when the power is turned ON? Go to step 8. Problem solved. 8 Turn the power ON. Does fan error occur? Replace the HVPS/Engine Logic Board . Problem solved. 9 Measure the voltage across P/J27-19 <=> P/J27-18. Does the voltage measure 24 VDC? (12 VDC when low-speed) Go to step 10. Replace the LVPS then go to step 8. 10 Measure the voltage across P/J27-18 <=> P/J27-17. Does the voltage measure 0.82 VDC or higher? Go to step 11. Replace the HVPS/Engine Logic Board . 11 Replace the Sub Fan Does the fan error occur when the power is turned ON? Go to step 12. Problem solved. 12 Replace the LVPS. Does the fan error occur when the power is turned ON? Replace the HVPS/Engine Logic Board . Problem solved.