HP LaserJet Enterprise 700 color MFP M775 series - Manual (Page 311)

Problem Cause Solution
The product is either low on toner or has
run out of toner. If configured, the product stops printing
as soon as it is low on toner or runs out
of toner. Any faxes received are stored
in memory and print after the toner has
been replaced.
The incoming call might be a voice call. Incoming voice calls usually show up in
the call report as a No Fax Detected
error. Because these are voice calls and
not a fax error, no action is necessary.
The incoming fax was interrupted. Verify that the fax telephone line does
not have an activated call-waiting
feature. A call-waiting notice can
interrupt a fax call in progress, which
causes a communication error.
The Fax Printing Schedule feature is set
to the Always store faxes option.
Change the Fax Printing Schedule
setting to the Always print faxes option.
ENWW Solve fax problems 297