Printronix L5520 - Manual (Page 143)

Clearing Service Level Messages
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At 900,000 pages, your service provider will do Level F, Level E,
and Level D service.
Note that this condition does not cause the printer to stop printing.
When one of the above messages appears, you should perform the
appropriate scheduled maintenance or call your factory-trained
service representative to perform the maintenance.
Clearing Service Level Messages
When you have done a level of service, clear the page count for
that service level. Note that when you clear a service level, the
levels that precede it are also cleared. For example, clearing level
C also clears levels A and B.
To clear a service level (level A, for example), select the
Maintenance menu from the control panel, select the User Maint.
option, then select “Clear Level A” by pressing ENTER.