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Switch off the M/C then press & hold zero button & on still when screen will display (---) then press '10' start button '1' start button. now your M/C showing 3 so you change it press '0' button then switch off &on
I would truly call in for service. Copiers require a trained tech to replace the fuser. Trust me I work in the IT industry. Have a trained tech fix it.
The most common explanation for the error 'U4-2' in all the 'Xerox' machines is "Fuser warm up failure occurred". I am very sorry that such a problem has occured for you. It cannot be solved by you, if you are not a qualified technician and without proper tools.
Please do call the nearest service centre for a visit and they will probably solve it in a day. Remember, they need the service manual procedures for solving it properly.
Don't worry, it is a very common problem. But only authorised service people can help you in a good way.
U4 code refers to a fuser heat failure, you'll probable find the fuser roll is stone cold .Possible cause is open circuit heater or overheat thermostat popped.Either way you will need to pull out the fuser unit and check continuity of the components
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