HP 2566C - Manual (Page 85)

Forms Thickness Acljustment Lever
This lever, located under the access cover on the right front of the
printer (Figure 6-5), is used to adjust the printer for maximum print
quality with various thicknesses of paper and forms. Next to the
lever are printed letters from “A” (minimum form thickness) to “N”
(maximum form thickness).
For further information on how this adjustment works, see “Adjusting
Forms Thickness” on page 3-21 and “Optimizing Print Quality” on page
6-14.
6-10 USING THE PRINTER