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CH code on a Sharp usually means the front door or a side door is not completely shut. Try opening and closing every exterior door until the code goes away. If the CH is flashing, it could mean either an optical or a heat roller fuse might have blown. Have you recently replaced any supplies?
Manual says F5 as copy lamp lightning abnormality.
Never had on AR series Sharp machines this trouble,but remember on old
Canon NP 6016 when lamp was bad -no dark ends and low intensity of
lightning but intensity too high.This machine was equiped with doc
feeder and customer performed a lot of copies from glass only and I
think he was damaged lamp when close the doc feeder.
the fluorescent type lamp was used on this Canon-Sharp uses Xenon lamp
(I think),but they could be very common in construction (tube with
electrodes on ends and gass inside)
This fault is very difficult to troubleshoot-try another lamp first,next sensor from good working machine.