How do I fix a paper jam shown by error codes Er/04, Er/05, or Er/06?
You need to clear the paper jam to resolve these error codes. HP recommends visiting hp.com/support for detailed instructions on clearing the jam. These codes may appear after initially turning on the printer. (Page 2)
From the official HP Laserjet Mfp M139e M142e Printer manual, page 2
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