Hi!
The 3501 error code means "acces door open"
Please be sure that the printer's acces door is well closed.
If this doesn't fix the problem, please do the following:
1. Turn the printer off by pressing the on/off button
2. Unplug the power cord
3. wait for 1 minute
4. plug the power cord back in
5. turn the printer on
Hope it helped.
Regards,
Bogdan
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