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I have a xerox 5016 copier ,

I am getting u4 error can you tell me how to correct it, really old model

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On this model, yes it can be the fuser thermistor, fuser relay, driver board, main board, especially the fuser fan turning very slow not up to speed.
Any of these combination can be a problem.
Also, there can be bad fuser rod connections that can cause this type of problems, and can only be repaired by a Xerox Service Representative.

Posted on Oct 16, 2009

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All U4 codes on Xerox machines relate to the "fuser".( That's the hot bit on the way out) You will find the rollers fail to warm up, or reach correct temperature .
Most often the heater rod inside has burned out, or sometimes the overheat thermostat goes open circuit.Both problems will require the fuser unit pulling out of the machine and a test meter to check continuity of the components

Posted on Jan 08, 2008

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1 Answer

How can fix error u4 code in xerox photocopier machine


http://xeroxmachineerrorcode.blogspot.com/2016/07/u4-error-code-xerox-wc50165020.html


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Y remove paper N proceed to step 2
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Y reinstall fuser N proceed to step 3
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2 Answers

I have a xerox 5016 copier ,


On this model sometimes the plugs on the connectors go bad.
They arc and will not connect good. Sometimes the ends have to be clipped and new pins male and female have to be crimped back on, replacing them on the machine part wiring connectors and fuser rod ends. this fuser kit is a part that is availiable at xerox.
A bad thermistor can cause this type of problem. If the machine overheats, the fuser triac pack can cause over heat problems as well.
On overheats the fuser fuse needs to be replaced. Do not replace with nothing else but a Xerox fuse, this is a safety device. Very important.
Otherwise place a service call to have this area repaired by xerox.

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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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