Compaq 5532 - Manual (Page 59)

Replacing the Ribbon
59
7. Lower the forms thickness lever. Set it to match the paper
thickness. (The A-B-C scale corresponds approximately to 1-, 3-,
and 6-part paper thickness.)
NOTE: Do not set the forms thickness lever too tightly; excessive
friction can cause paper jams, ribbon jams with potential for
ribbon damage, smeared ink, or wavy print.
8. Close the printer cover.
9. Press ON LINE to return the printer to online mode.
A
B
C