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Have you tried Adj. 5A Image skew adjustment. That usually does it for us.

Check doctor blade gap according to the manual. Or get a new dev. assy.

Have you tries this?29371

Are you using Sharpdesk or scan to network folder?

Your developer material or the unit is bad. Or if you are using off brand toner it is not dropping into the developer correctly. Only cure for that is to go back to Sharp toner.

do you mean the mx-4501? because there is no 4500. and what about the firmware, do you need firmware?