Ricoh MV74 Operator's Manual page 105

SETTING UP THE PRINTER
Setting Paper Thickness
You use the paper thickness lever to adjust the distance between the print
head and the paper to accommodate different paper thicknesses. This
distance is called the print gap.
Set the green lever according the ink cartridge you are using:
To the left for printing on normal paper
using Ink Cartridge Type 120 Black.
To the center for printing using Ink
Cartridge Type 125 Color .
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