Formatter
Formatter heartbeat LED
The heartbeat LED indicates that the formatter is functioning correctly. While the product is initializing
after you turn the product on, the LED blinks rapidly, and then turns off. When the product has finished
the initialization sequence, the heartbeat LED pulses on and off. For more information abut the heartbeat
LED see
Formatter heartbeat LED on page 133.
DIMM slots
CAUTION: Single inline memory modules (SIMMs) used in previous HP LaserJet products are not
compatible with the product.
The formatter has one dual inline memory module (DIMM) slot for upgrading the product with more
memory.
To find out how much memory is installed in the product, print a configuration page. For more information
about memory, see
DIMM cover and DIMM on page 57.
ENWW Engine-control system 23
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