Xerox 8850 Service Manual page 60

[9-55-5]. Select the black squares (A) and use the SIR 495.01 (PN 82P520) reference scale to
measure the density.
SPECIFICATION:
Bond Media - No more than 0.3 Solid Area Density (SAD) difference the black (A) squares.
Film - TBD
Image Density (Text)
This term refers to the image density of text on the same print.
(Figure 1): Use a wide roll of media and run test pattern
[9-55-5]. Select the image blocks and use the SIR 201.01 reference scale to measure the den-
sity.
SPECIFICATION:
Bond Media - Equal to or greater than density 28.5.
Film - Equal to or greater than density 20.6 in center of print.
Image Density (Text) Uniformity
This term refers to the uniformity of image density of text on the same print.
Use a wide roll of media and run test pattern [9 -55-5]. Select the image blocks and use the
SIR 201.01 reference scale to measure the density
SPECIFICATION:
Bond Media - Equal to or greater than density 20.6 and less than 42.4.
Film - TBD.
Line Width (Minimum)
This term refers to the visual observation of lines.
(Figure 1) Use a wide roll of media and run test pattern
[9-55-5]. Select the image blocks and use the SIR 201.01 reference scale to measure the den-
sity
SPECIFICATION:
Bond Media - No breaks in horizontal or vertical lines.
Film - No breaks in lines.
Print Quality
Print Quality Specifications
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 the Background Reference Scale 302.02.
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.
(Figure 1) : Use a wide roll of media and run test pattern [9-55-5. Evaluate the resolution tar-
gets (B) at each corner and three central locations for a total of seven targets.
SPECIFICATION:
Bond Media: Using a (7X) magnifier the vertical and horizontal resolution for all targets should
be equal to or greater than 4.0 LP/mm.
Film Media: Using a (7X) magnifier the vertical and horizontal resolution for all targets should
be equal to or less than 3.2 LP/mm.
03/2003
3-6 8850/ 510DP