IBM 4332-004 - InfoPrint 40 B/W Laser Printer User Manual page 165

4. Remove the envelope feeder if attached. See "Removing the Envelope
Feeder" on page 190 for removal instructions.
5. Open the duplex unit (if installed).
6. Pull on the latch to open Cover A.
7. Open the toner cartridge area cover.
8. Replace the fuser.
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Chapter 7. Maintaining the Printer