Epson STYLUS 7890 - Manual (Page 206)

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206 | Using the Optional Auto Take-Up Reel
4. Reverse the paper stop so that the smaller knob is on the outside. Then
pinch the knob and reinstall the paper stop on the movable unit.
Installing a Take-Up Reel Core
1. Make sure the lock lever is released. Then slide the movable paper stop
all the way to the left.