Post 5 made on Thursday December 10, 2020 at 22:57 |
buzz Super Member |
Joined: Posts: | May 2003 4,378 |
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I don't recall if they emit any visible radiation, most do. If you cannot see the lens, perhaps sliding a piece of paper over the lens will allow you to see something. Most of the heads that I've seen will emit a quiet "click" as they attempt to focus on an empty tray.
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