What should I do if I encounter error code E04 during printing?
Refer to the User Guide on the printer CD or visit the relevant support websites (www.hp.com/support/ljM607, www.hp.com/support/ljM608, or www.hp.com/support/ljM609) for troubleshooting steps related to error code E04.
From the official HP Laserjet Enterprise M607 manual, page 1
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