Download Digital Equipment Corporation DEClaser 1100 Series Technical data

1.11 HVPSA Density Circuits
1.11 HVPSA Density Circuits
The HVPSA and density adjustment assemblies are replaced as FRUs. There
are no internal field adjustments.
1.11.1 Density Adjustment
The density adjustment lets the user choose lighter or darker printing. The
default shown in Figure 1–14 is the recommended normal position for the
sliding adjuster.
Figure 1–14 Density Adjustment
Default
MLO-006063P
As shown in Figure 1–15, VR701 is the density adjustment potentiometer. As
VR701 is adjusted from dark to light, the VR signal varies from approximately
0–8 Vdc. VR varies the primary and development dc bias voltages which varies
the quantity of toner on the drum and on the sheet.
•
The darkest setting makes printed text dark, reduces background staining,
and uses up the toner supply at a faster rate.
•
The lightest setting makes the text lighter and increases background
staining. The increased staining is imperceptible on flat cut sheets, but is
more noticeable when printing envelopes. See Section 8.16 for additional
information.
Physical and Functional Description 1–25