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The error has to be manually reset. Here is what I found from the official procedure. Hope it works.
How to clear a fuser error code (C0500, C0501, C0510, C0511, C0520, C0521).
To clear the fuser error code, perform the following after correcting the cause: 1. With power ON, open the front door and locate the small, rectangular hole below the imaging unit removal tool. Note: It is not in the same location as the models 7915/7920. 2. Insert a suitable object into the hole to actuate the reset switch .3. The code should clear and a message to close the front door should appear.
This error code is a fuser problem and maybe in my experience a morning problem. Try to clear the error the error with this procedure: Hold down utility counter for 3 seconds and in the screen will appear a trouble reset, then touch it and turn off and on the main, it will clear the error code. If it does not see if you have fuser problems with the termisotrs and also check the power.
An error has been detected with the item indicated "XX" in the service message.
Reboot the printer. This often clears the service message, and printer operation can resume.
If the problem persists, contact Technical Support
tis error means abnormal tonder density in the balck image unit take the blacke image unit out and shake it while holding it level and put it back in the machine to reset the error code leave the machine on and open then close the front door
Hello sir; The error code you display, it's exposure lens not go back home possition, my suggestion; remove the glass turn off power, manually move the lens unit for and back find is somethings block over there or check the home possiton senser.