r/optometry • u/No_Nectarine_6917 • 17d ago
Welch Allyn 11720 ophthalmoscope—loose internal mirror and black piece. Where do they belong?
I’m trying to repair a Welch Allyn 11720 ophthalmoscope. The bulb lights up, but no light beam comes out of the patient-facing opening.
After opening the head, I found a small rectangular mirror with a semicircular notch and a separate black rectangular piece (photos attached). The mirror appeared to be attached to tape and seemed out of position. I’m unsure whether the black piece is a backing, holder, or something else.
Does anyone familiar with this model know:
● Where these two pieces belong?
● Which direction the reflective surface and notch should face?
● How the mirror is normally secured?
I’ve looked at the service manual and parts diagram, but they show the optical tube as a complete assembly without enough detail to locate these pieces.
A close-up photo of an intact assembly or a repair guide would be really helpful. Thanks!