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XEROX DOCUPRINT 4850/4890 NPS TROUBLESHOOTING GUIDE 6-1
6. 6Adjusting print quality and
speed
This chapter considers means for checking and optimizing print
quality and speed.
Adjusting print quality on DocuPrint Models 4890 NPS and 4850 NPS
The system maintains optimal print quality by monitoring the state of
the dry inks for each new print job. If the print quality would be
adversely affected, the printer automatically runs a Print Quality
Adjustment (PQA) before printing the next document. The printer
also automatically runs a PQA if it has been idle for a period of time.
(The default period is 16 hours, but the service representative can
reset it.)
When the printer requires a PQA, the printer console displays a
message. It also displays one of two messages indicating the state
of the dry ink housing:
• Ready
• Not ready—You must run a PQA
Note: If either the black or the color housing is not ready, the
system runs a PQA before printing the next document, whether that
document is black only or highlight color.
You do not have to wait until the printer automatically runs a PQA.
You can run PQAs routinely so as to limit the number of printer-
requested PQAs.
You can start a PQA anytime. The printer performs the PQA when
the manual PQA document is scheduled for printing. A PQA takes 2
to 20 minutes. If you use the color housing daily and and keep it in a
stable environment, a PQA usually takes 2 to 5 minutes.
If a PQA command is issued on an NPS system with a bypass
transport installed, the trailing sheet is sent to the bypass transport,
but the test patterns are not.