Question about Printers & Copiers
I am getting u4 error can you tell me how to correct it, really old model
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
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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