Xerox 4650, 4450 manual Determining line density limitations, Landscape pages, Portrait pages

TROUBLESHOOTING

	The hardware limitation of 320 dispatchable items per 300 spi
	scan line (640 for 600 spi) includes the required overhead of two
	dispatchable items. For example, a dispatchable item could be a
	maximum of 32 dots wide for 300 spi (64 dots for 600 spi), and
	thereby might be a full character (less than point size 8 or 9), a
	fraction of a character (greater than point size 8 or 9), or a line
	segment that is equal to or smaller than 32 dots in the scan
	direction.
Determining line density limitations	The following is a guide for determining 300 spi line density
	limitations. If printing at 600 spi, the same size character or same
	length line has twice as many dots, as follows:
	· Every 32 dots (or fraction thereof) of a line drawn on the
	long axis of the paper are one dispatchable item.
	· Each line drawn on the short axis of the paper is one
	dispatchable item.
	· Each active character is at least one dispatchable item. (An
	active character includes all the space from the top of the
	character cell to the bottom of the character cell, even if
	there is only white space present on a given scan line.) If the
	dimension along the scan line is greater than 32 dots, the
	character consists of some multiple dispatchable items.
	It is not possible to construct a form with two adjacent lines if
	both use the full count of 318 dispatchable items (320 minus the
	two required for overhead) resulting from text and lines. The
	imaging system requires a rest period of about four scan lines
	before it can image the second fully loaded line.
Landscape pages	Line density restrictions differ as a function of the mode
	(landscape or portrait) of the form. An 8-point or smaller
	landscape font is smaller than 32 dots for 300 spi and 64 for 600
	spi. A vertical line is a single dispatchable item. A horizontal line
	is treated as a series of 32 dots in length, joined end-to-end.
	For 300 spi, this means that a form using an 8-point or smaller
	font on a landscape page may have up to 318 characters (plus a
	two-item overhead, for a total of 320 dispatchable items) on a
	scan line. For example, when using a 6-point font, it is possible
	to have 132 characters, a line across the page under the text, and
	up to 90 vertical lines, without exceeding the line density
	limitations.
	If a form requires a 9-point or larger font, the number of
	characters that may be imaged on a landscape page is reduced to
	160 because the characters are generally more than 32 dots
	wide. While the dispatchable-item count remains 320 per line,
	fonts 9 points and larger use two dispatchable items per
	character. Since a character in a large font constitutes two
	dispatchable items, only half as many characters in a large font
	may be imaged on a scan line as is possible with a smaller font.
Portrait pages	Restrictions for a portrait page are significantly different from
	those for a landscape page because the system always images in
	the landscape direction. Therefore, if a page is formatted in
	portrait orientation, the hardware must reorganize the data into
	landscape prior to imaging.

XEROX 4050/4090/4450/4650 LPS FORMS CREATION GUIDE 4-7