IBM INFO PRINT 3000 Operator's Manual page 122

DEVELOPER AREA:
9. Open the left top and front center left covers of the printer.
10. The printer has three coronas that you need to clean. The charge corona (1)
and the pre-clean corona (2) are in the developer area; the transfer corona (3)
is in the transfer station area.
To clean the charge (1) and preclean (2) coronas, do the following:
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InfoPrint 3000 Operator's Guide