Epson DFX-9000 Guia De Referência

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Paper Handling
9. Slide the left sprocket to remove any slack in the paper. 
Make sure the paper is straight and has no wrinkles. Push 
the sprocket lock lever back to lock the sprocket in place. 
After you lock the left sprocket, it may still move slightly; 
this is normal.
Note:
Be careful not to pull the paper too tightly when adjusting the left 
sprocket.
10. Close the back cover and flap.
sprocket lock lever