HP Color LaserJet CP3520 Printer Series - Manual (Page 217)

Heartbeat LED
The heartbeat LED indicates that the formatter is functioning correctly. While the product is initializing
after you turn it on, the LED blinks rapidly, and then turns off. When the product has finished the
initialization sequence, the heartbeat LED pulses on and off.
If the heartbeat LED is off, the formatter might have a problem. Contact an HP-authorized service or
support provider. See the HP support flyer, or go to
www.hp.com/go/cljcp3525_firmware .
ENWW Understand lights on the formatter 205