HP LaserJet Enterprise 600 Printer M603 series - Manual (Page 206)

5. Reinstall the envelope feeder.
6. Press the OK button to clear the jam message.
7. If a jam message persists, an envelope is still
jammed in the product. Look for the jam in
another location.
8. Replace the envelopes, making sure that you
push the bottom envelopes in slightly further
than the top envelopes.
Clear jams from the top-cover and print-cartridge areas
1. Open the top cover.
2. Remove the print cartridge.
CAUTION: To prevent damage to the print
cartridge, do not expose it to light for more
than a few minutes. Cover the print cartridge
with a sheet of paper while it is outside of the
product.
190 Chapter 10 Solve problems ENWW