OK, CH normally means the one of the covers(front or side panels) is open or the developer unit is unplugged try these to see if that fixes the problem. p.s When the covers are closed a small tab on the covers triger a interlock switch or optical switch. Hope this helps
SHARP SF-1118 photocopier CH Error
There is a switch on rear on the machine were the black arm goes in could need adjusting.Have to remove rear cover to do this.
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Thank you for your advice it took care of the problem.
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