HP Designjet 5500mfp Color Manual page 58

The Normal position gives the highest scanning speed. In the extended media
thickness position, scanning speed is automatically reduced.
When combining thick media handling (paper guide in extended position) with
Auto Size Detection, the size detection should be done separately by running a
preview scan before the final copy or scan.
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Color Reproduction for the HP Large Format Color Copiers family: cc800ps, 815mfp, 5500mfp and 4200 scanner