8.4 Poor print quality
348 A29246-X20-X-4-7680 / fa805.fm
8.4 Poor print quality
8.4.1 Poor printing
The main reasons for poor print quality are listed in section 8.4.2 Poor printing, cause and
correction >>> page 349. If this information is not sufficient to correct the error, call the
service center.
Dropouts and spots due to faulty photoconductor drum
Dropouts are places that lie within the minimum permissible character contours and are as
bright as the unprinted areas.
Spots are printed areas found outside the character contours. They are as dark as normal
print characters.
The photoconductor drum is usually at fault if dropouts and spots regularly recur after one
drum rotation, in other words, after approx. 760 mm (corresponds to 2.5 pages, 12" in
length).
The following number of spots and dropouts is permitted for new photoconductor drums per
12"form:
Size Number per 12" form
Spots <0.25 mm 5
0.25 mm to 1.5 mm 2
Dropouts <0.5 mm 2
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