Lexmark claims 43dBA as the noise level of the C543dn when printing, but we measured peaks of 57dBA at half a metre. While the claimed noise level looks exaggerated, subjectively this is only a moderately noisy colour laser.
Exaggerated claims extend, as usual, into print speeds, though not by as much as we often see. Lexmark claims 20ppm for both black and colour print and we saw 8.57ppm on our five-page test document. When we ran the 20 page test, however, it ran at 16.67ppm – not far off the claim. Our five-page colour test produced a speed of 10.34ppm.
Switching to duplex mode slowed the machine considerably, partly due to a short pause between feeding the first side out and feeding the paper back in again to print the second. We managed 9.02spm on a 20-side document.
The printer produces excellent black text; sharp and crisp and business graphics are bright and attention-grabbing. They’re sometimes a bit too vivid, though, while there are registration problems when printing black text over coloured backgrounds. Our sample photo print suffered from this overzealous use of colour, but was remarkably free of banding and produced good gradated fills. We noticed a halo effect around profiles against a blue sky.
There are two versions of the toner cartridges available for the C543dn and a mark in Lexmark’s favour is that this machine ships with high-yield versions of black and colour cartridges. These give 2,500 back pages and 2,000 colour ones.
Because the machine is new, there aren’t many outlets selling consumables for it yet, so the cheapest prices we could find may come down further in the next few months. As well as the toner cartridges, you’ll need to replace the black and colour imaging unit after 30,000 pages and the waste toner bottle after either 18,000 or 36,000 pages.
Using online prices, we get costs per page of 3.16p for black pages and 12p for colour, including 0.7p per page for plain paper. These costs are high, with the colour page cost being the highest we’ve seen from a colour laser printer in a good while.
The C543dn is good in parts, printing quite quickly and producing quality text and reasonable graphics. Having duplex print built into a colour laser at this price point is also valuable but, against this, colours need reining back and the running costs are surprisingly high, though these may drop with time.