Nikon LS-4500AF - Manual (Page 52)

32 Nikon Film Scanner LS-4500AF User's Manual
To replace a tray, pull the sliding spring catch forward to release the tray,
remove it, replace with a new tray, and secure it with the sliding spring
catch.
Step 2
When a tray for one frame is fitted, check that the turntable and the back
side of the depression in the tray do not interfere with each other.
6. Using the Film Holder