Heartbeat LED
The heartbeat LED indicates that the formatter is functioning correctly. While the MFP is initializing
after you turn it on, the LED blinks rapidly, and then turns off. When the MFP has finished the
initialization sequence, the heartbeat LED pulses on and off.
If the heartbeat LED is off, the formatter might have a problem. Replace the formatter. See
Formatter
cover and 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.
334 7 Troubleshooting
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