Help needed np 2020 CANON copier

[vixentd]

The code is EOOO which I think means fuser. Apparently you can try to reset by pressing switch 301.

I have taken off the back cover but can not find this switch?

Any guidance appreciated.

I did a search and nothing came up. Perhaps to old.

[blackcat4866]

On the left hand side of the copier there is a small 2" x 3" door lower rear with one screw. Inside is the side view of a PCB where the switch is, and various other adjustments.