Xerox 8830 Service Manual

Print Quality Specifications
Test Patterns
There are nine internal test patterns that can be
run from diagnostic mode [9-55]. (refer to
Section 6. for details)
Test Pattern 1 is used while adjusting lead edge,
trail edge and side edge erase.
Test Pattern 2 is used to produce horizontal
black and white horizontal/vertical bands and
resolution targets.
Test Pattern 3 is used to produce ROGM image
targets and 1.25" solid area squares that are
97.5 mm apart.
Test Pattern 4 is used to produce a 49 mm wide
horizontal black band that is 450 mm from the
read edge of the print.
Test Pattern 5 is used to produce solid area
squares, ROGM image targets and a grid of thin
horizontal and vertical lines.
Test Pattern 6 is used to produce diagonally
placed small ROGM targets.
Test Pattern 7 is used to produce diagonal
horizontal and vertical lines that are 16.25 mm
apart.
Test Pattern 8 is used to produce solid blank
vertical bands that are 93.5 mm wide.
Test Pattern 9 is used to produce various small
ROGM patterns.
Solid Area Density (A)
This term refers to the image density of a totally
black portion of the print.
Use a wide roll of media and run test pattern
[9-55-5]. Select the black squares (A) and use
the SIR 495.01 (PN 82P520) reference scale to
measure the density.
SPECIFICATION:
Media All sites equal to or greater than 1.0
Solid Area Density (SAD)
Film All sites equal to or greater than .85
SAD
Background
This term refers to the density of the print in any
non-image area.
Use a wide roll of media and run test pattern
[9-55-5]. Examine the print using
Background Reference Scale 302.02.
the
SPECIFICATION:
All non-image area should be no greater than
3.7 at printer installation and no greater than 5.9
over the life of the developer.
Skips
This term means that a print image is partially
deleted or appears stretched at a right angle to
the media feed direction .
Use a wide roll of media and run test pattern
[9-55-5]. Examine the 2.0 LP/mm vertical band
located near the center o the print for skips or
smears.
SPECIFICATION:
The 2.0 LP/mm lines should be resolved.
Resolution
This term refers to the degree to which fine
details of a print are reproduced, for example,
lines.
Use a wide roll of media and run test pattern
[9-55-5], Evaluate the resolution targets (B) at
each corner and three central locations for a
total of seven targets.
SPECIFICATION:
The vertical and horizontal resolution for all
targets should be equal to or greater than 4.0
LP/mm.
Figure 1. Test Pattern [9-55-5]
1/98
Print Quality Specifications

Xerox 8830 Specifications

General

Brand	Xerox
Model	8830
Category	Printer
Language	English