IBM INFO PRINT 3000 - Manual (Page 128)

Important Note About Cleaning the Coronas
There is no device to prevent you from pulling out the coronas. Be
careful not to break the thin wires and tiny retractor springs inside the
corona assemblies.
a. Gently pull the white corona toward you until it is almost out of its track.
A brush inside the corona housing cleans the corona.
b. Gently push the corona back into place. Ensure that you have pushed the
corona in completely.
25. Clean the brushes below the transfer station.
26.
Gently lower the transfer station toward the photoconductor drum and latch it
using the Transfer Station Control Lever. See “Transfer Station Control Lever
and Tractor Control Levers” on page 25 for details.
27. Close the top left and front center left covers of the printer.
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InfoPrint 3000 Operator’s Guide