HP LaserJet M4345 MFP - Fax LED

If the heartbeat LED is off, the formatter might have a problem. Replace the formatter.
Fax LED
The LED on the HP LaserJet analog fax accessory 300 indicates that it is functioning correctly. If the
LED is off, see the HP LaserJet Analog Fax Accessory 300 User Guide for information about solving
the problem.
ENWW Formatter lights 367
manuals4you.commanuals4you.com