Epson XP-102 reflector sensor removed

Hello!

I had some issues reassembling the printer and now I can't test the printer, not even the scanner (it is an Epson XP-102) because at some point, when I flipped the whole printer upside-down, I heard something fall inside. Then I saw it was a small part, around 5mm x 5mm with a mirror on one side (it has a corner shape, the rest is plastic black).

I now get an error message and the scanner can't operate either because of busy printer message.

I searched it with AI chatbots, it turns out to be a reflector of the print head sensor mechanism, so, now that this reflector is removed the printer can't start any task because it can't find where the print head is.

I saw some youtube videos carefully, still can't find where is this little parts normal installation position.

If you have any clue it would be really helpful. Also if you happen to have the spare parts list-manual of XP-102, or any maintenance manual, so that I continue searching myself.

You can see the part's photos attached.

Thank you in advance!

You will find this in the service manual. Unfortunately I could not find a free one available for your model on the internet.

However, with the power of Ctrl-F on my side, I went through a few manuals of similar XP-000 printers, looking for "reflector" and was able to locate the part. It is called the "fault detection plate" and I attached a screenshot for you.

Thank you very much for your response! I will try it and get some feedback!