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You probably have some build up on the glass, which happens if you use the auto feeder most often. Alcohol type cleaner will remove with a very softcloth. One small dot will look like a long streak on a feeder, much like a streaked fax. The other issue is the photoreceptor belt has nicks or is dirty eaither way it needs to be replaced. Try the cleaning first and you may have to look hard for the small dots built up on the glass.
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.
When the covers are closed a small tab on the covers triger a interlock switch or optical switch.
Hope this helps