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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
U9 in wc group is problem with HVPS. check charge & trf corotrons for leakage. isolate with removing charge or transfer corona each at a time.... U9 disappears; Reinstall HVT. Clean charge corona sawtooth & grid; tighten the grid on charge corona assembly.
Hi, I made a mistake, sorry. It is not a 423 Greyscale etc.. that I own but a Xerox Workcentre pro 420 black and white photocopier. I have but no manual to find out how or if it has a 'mirror' or 'inverse' function. Thanks
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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