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ADJUSTING PRINT QUALITY AND SPEED
6-4 XEROX DOCUPRINT 4850/4890 NPS TROUBLESHOOTING GUIDE
Calculating throughput
For measuring performance, note the start time, stop time,
decomposition time, elapsed time, and pages of the job being
measured:
• The start time is the time that the sequencer began to
decompose the job (translate the PostScript).
• The stop time is the time the last page was printed.
• The decomposition time is the time (in seconds) spent working
on the job. The decomposition time can be increased by factors
such as use of highlight color, images that compress poorly,
duplexing, and job size. See the Guide to Using Page
Description Languages for more details about factors affecting
performance.
• The elapsed time, equal to the stop time minus the start time, is
the total amount of time DocuPrint spent printing the job. The
elapsed time includes delays for warm-up time, paper loading,
jam clearing, print quality adjustments and the start-up latency
associated with the first job in a set of jobs.
• The “pages” number represents the number of images printed,
(not the number of sheets printed when running a duplex job).
To make a meaningful measurement of performance, obtain the
measurements while the printer is running a block of jobs. Since start
and stop times tend to overlap between jobs in a block, the only way
to obtain a measurement using the start and stop times is to use the
start time when the printer first powers up to print a block of jobs, then
subtract that start time from the stop time when the printer powers
down as shown in this procedure:
1. Enter Stop Printing at the Printer Controller.
2. Enter Set Option ForceReport False and Set Option
UseTitlePage False. This to avoids extra pages in the output
that are not included in the pages reported in the sequencer
log.
3. Send a series of jobs to the DocuPrint.
4. Use the List Documents command to determine that the jobs
have passed the prescanner and have a Pending status.
5. Enter Start Printing.
Job #91 stop, ftpadmin, rxlb300-ps2.ps, November 14, 1996 9:46:50 am PST
pages: 30, decomp: 17.22, elapsed: 73.27, compress: 5.02x, min
free: 101618K
compress pages: 90, expand pages: 0
Job #92 stop, ftpadmin, rxlb300-ps2.ps, November 14, 1996 9:47:10 am PST
pages: 30, decomp: 17.14, elapsed: 74.36, compress: 5.02x, min
free: 101202K
compress pages: 60, expand pages: 0
Job #93 stop, ftpadmin, rxlb300-ps2.ps, November 14, 1996 9:47:30 am PST
pages: 30, decomp: 17.71, elapsed: 75.19, compress: 5.02x, min
free: 100750K
compress pages: 30, expand pages: 0