HP LaserJet Pro 400 color M451 - Internal components (3 of 5)

Print speeds
Print speed is the number of pages that print in one minute. Print speed depends on different engine-
process speeds or operational pauses between printed pages during normal product operation. Factors
that determine the print speed of the product include the following:
●
Page formatting time
The product must pause for each page to be formatted before it prints. Complex pages take more
time to format, resulting in reduced print speed. However, most jobs print at full engine speed
(21 ppm on Letter-size media or 20 ppm on A4-size media).
●
Color mode
Monochrome printing (black only) provides the maximum print speed. Full color print jobs cause a
reduction in print speed.
●
Media size
Legal-size media reduces print speed because it is longer than the standard Letter- or A4–size
media. A reduce print speed is used when printing on narrow media to prevent the edges of the
fuser from overheating.
●
Media mode
Some media types require a reduced print speed to achieve maximum print quality on that media.
For example, glossy, heavy, and specialty media (for example, envelopes or photos) require a
reduced print speed. To maximize the print speed for special media types, ensure that you select
the correct media type in the print driver.
●
Product temperature
To prevent product damage, print speed is reduced if the product reaches a specific internal
temperature (thermal slow down). The starting temperature of the product, ambient environment
temperature, and the print job size effect the number of pages that can be printed before the
product reduces the print speed. Thermal slow down reduces print speed by printing four pages
and then pausing for an amount of time before printing continues.
●
Other print speed reduction factors
Other factors (especially during large print jobs) that can cause reduced print speeds include:
◦
ITB cleaning and lubrication; occurs every 50 to 80 pages and takes about 60 seconds.
◦
CPR control sequence; occurs every 450 pages and takes about 90 seconds.
◦
Density control sequence; occurs every 150 pages and takes about 120 seconds.
164 Chapter 2 Solve problems ENWW
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