Kamaluddin, Mohammad Rahim
(2011)
Study on the variability of printed documents produced by laserjet
Printers (hp laserjet p3005 printers).
Other.
Pusat Pengajian Sains Perubatan, Universiti Sains Malaysia.
Abstract
This study looks at the variability of prints produced by LaserJet printers. Five HP LaserJet
P3005 printers were used to print out a letter consisting of a mixed of letters and numbers at
different fonts. Seven duplicates were printed from each printer and compared using a
stereomicroscope. Printed samples were also obtained from two selected printers in time
interval of a week over a period of about a month.
Results based on microscopic examination by stereomicroscope on the printed documents
from some printers of same brand and model had shown specific characterizations. Some
specific individual patterns are shared by a subgroup of printers that used in our study.
Though, it is difficult to link such printed material to an individual printer, this study helps to
include or exclude the possible source of the printer from same brand and model. Microscopic
examination on the printed documents printed over a period of four weeks revealed the drastic
changes between first week and third or fourth week in terms of the thickness of the alphabets
appears to be caused by insufficient toner. Hence, it enables to determine the order of printed
materials in terms of the time interval of a few weeks. This study agrees with previous
reported observation stating that individual characterization of the printed documents can be
used to link a document to at least a group of possible printers.
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