HP Designjet 5100 Printer series - Manual (Page 38)

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Load and unload material
HP Designjet 5100 printer Customer Reference Guide
7 Press the wind button again.
8 The printing material hanging down will be wound onto the core tube.
9 Slide open the spindle lock on the right-hand side of the take-up reel.
10 Remove the take-up reel spindle.
11 Unlock and remove the left-hand spindle guide from the take-up reel spindle.