Small black plastic piece fell out of Printer 6520 while cleaning printheads

[abikerider]

I was removing my printheads to clean them and dropped a small metal part that holds the clear plastic timing strip on the left side into the printer while reassembling it. When I turned the printer upside down to get the part, it fell out along with an unknown part. I do not know where this extra part goes. It is black and clear plastic and about 1" x 5/8" x 1/2" in size. I have attached pictures of the part. Could I get an exploded parts diagram or can someone tell me where it belongs?

[abikerider · Accepted solution]

It turns out that the plastic piece is for the power on/off switch. I realized it was missing after I reassembled everything. I hope this helps someone else.