ETB life under different circumstances
Depending on the printer workload, the customer will need to replace the ETB once or twice
in the life of the printer. In order to help plan supplies purchases, the HP Color LaserJet
5500series printer calculates an estimated remaining number of pages that can be printed
on the ETB and displays this on the Supplies Status page under Transfer Kit: HP Part
Number: RG5-7737-000CN. You can view the Supplies Status page by printing it from the
printer’s control panel. If the printer is connected to the network, you can also view the page
in your Web browser, through the HP Web Jetadmin software or the HP Toolbox (HP Color
LaserJet 5550 models only).
The number of pages an ETB can print is a function of two factors:
● The number of times the belt goes from a stationary to a rotating state (spins up)
● The number of pages printed on the belt
Unless print jobs are queued back to back, each print job will require the belt to spin up.
Think of the ETB as having a limited number of wear units. It has 200,000 wear units when it
is new. Each time the belt spins up, it uses two wear units. Each time it prints a page, the
belt uses one wear unit.
Since most print jobs are not queued, the average number of pages per job, or job length, is
a factor in how fast the ETB will wear out. The shorter the average job, the faster the ETB
will wear out.
Figure 4-1. ETB total page count according to average job length shows how many pages
an ETB will print, given various average job lengths.
Figure 4-1.
ETB total page count according to average job length
The printer assumes an average print job length of three pages to estimate how many pages
are remaining on the ETB. For an average job length of three pages, the ETB will print
120,000 pages.
If all print jobs are exactly three pages long, for each page printed the number of estimated
pages remaining would decrease by one, beginning with the maximum 120,000 pages. If the
job’s length is less than three pages, the estimated pages remaining number decreases
more quickly than the rate at which the number of pages actually printed increases. If the
job’s length is greater than three pages, the number of pages remaining decreases less
quickly than the rate at which the actual number of pages printed increases.
ENWW Approximate replacement intervals for supply items 107
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