The first thing we noticed about the HP LaserJet 2420dn once we got down to
actually printing was its impressive speed. HP claims a wait time of
less than 10seconds between cueing up a print job and the printer starting to
spit out pages, and we'd say this was a conservative estimate.
This printer is extremely quick to respond. The full duplex
printing worked well, and used the standard system of spitting the
half-completed pages out, then rolling them back in to print the second
The time from the beginning of
a print job to the first page being printed averaged about 5.5 seconds in our
experience. From power-off to ready state took ~20seconds. Our
initial print tests showed crisp text and and graphic quality.
Duplex printing worked well also, though the HP LaserJet 2420dn goes through
a rather traumatic process to print each page, spitting it half out then audibly
reversing its gears and pulling the page back in, before reversing the gears
again and ejecting the finished page. The results were great, but we have
to wonder how much wear and tear constant duplexing will inflict on the
Another thing we noticed was the flimsy plastic multipurpose paper
tray. This thin plastic tray is supposed to hold 150 sheets of paper, but
we're not reassured by its apparent lack of strength. We could easily see
this snapping off, especially when extended.
Noise and bad smells
The HP LaserJet 2420dn is
about average for a laser printer in terms of noise. It's not
silent, but it's certainly not going to have the office in an uproar
either. We noticed a significant 'hot toner' smell when printing large
documents, but this was only perceptible in the immediate area of the
unit. The printer itself did not heat up noticeably during
operation. Print Quality Results
Our black and white image quality tests were accomplished
with PDF versions of the following two images printed in both 600 and 1200 dpi.