Bio-Rad Model 550, Ultramark, and Benchmark Microplate Reader Accessories - Manual (Page 18)

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3. Remove thumbscrew holding
filter magazine in place.
4. Remove filter magazine.
5. Reach inside instrument,
locate dropped filter, and
remove.
6. Reinsert filter into clip in
magazine, replace the
magazine and side panel, and
turn the instrument back on.
7. Specify in Microplate
Manager that the filter is in
the magazine, not the filter
arm.