Xerox 4450 - Manual (Page 58)

TROUBLESHOOTING
On a 300 spi portrait page, a 12-point font drops the
dispatchable-item count below the 320-character level. A form
with a 12-point font cannot have more than 160 characters on a
scan line.
When using an 8-point 300 spi font on a portrait page, the
maximum dispatchable item count is approximately 200 per scan
line. This limit falls off to 170 characters for a 6-point font, 150
characters for a 5-point font, and 120 characters for a 4-point
font. (If printing at 600 spi, the same size character or length
line has twice as many dots.)
Superimposed lines
Since lines superimposed over each other count as double the
dispatchable items of a single line, they detract from the system
capabilities. If printing at 600 spi, you see the following
message:
EXCEEDED LINE DENSITY.
Page generation errors
Generally, a form is imaged along with variable data. It is
possible to create a form that prints correctly when sampled but
cannot successfully be overlaid on certain variable data pages.
The LPS may not have enough time to merge a complex form
with a large amount of variable data within the limits of the
throughput environment. In this case, either reduce the amount
of variable data, or simplify the form.
Review the broken page to determine the approximate location
of the failure, and try to reduce the number of characters and
lines in that area. Most imaging problems are local density of
information problems rather than page-wide problems.
Local density and page setup errors
One problem that may occur while a page is being imaged is a
page setup error, displaying the following message:
OS9300 PAGE SET-UP ERROR
This message means that there was not enough time to image a
page. This may be caused by an excessively large amount of
data and forms to be imaged, disk errors, image generation
problems, or a problem known as local density.
Even a form designed to avoid exceeding line density limitations
may cause page setup errors because of local density. However,
such problems are rarely encountered in readable forms. To
have a problem area of local density, a form would have to have
long lines of very closely spaced small text.
A local density problem occurs when the imaging hardware
accepts and dispatches characters at two different rates. If a
form structure imposes a dispatching load that is too heavy, the
hardware may run out of input before the data processing is
finished.
4-8 XEROX 4050/4090/4450/4650 LPS FORMS CREATION GUIDE