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1. Check for paper on the fuser. Y remove paper N proceed to step 2 2. Check the installation of the fuser assembly, make sure it is securely installed. Y reinstall fuser N proceed to step 3 3. Remove the fuser. Check the conductivity of the contact points of the thermostat, are the contact points connected N replace the fuser
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.
The fuser is not warming up.
On that machine under the web there is a thermal fuse on a white plastic mount, it has one screw through it.
It is most likely blown. Possibly caused by a jammed paper in the fuser.
That fusable link needs to be replaced.
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