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Bob Larter

wrote:
On Sun, 19 Jul 2009 08:21:20 -0700, notme wrote:

What is it about laser printers that causes UPS manufacturers to recommend
they not be powered by a "stepped approximation to sine" UPS? It's a SMSP,
isn't it? What makes it special such that it needs sine-only? No such caution
re. computers, etc...

Thanks.

Possibly because some laser printers have 1000 watt fusing elements
and most home UPS units can't provide that much power?

IIRC, the fusing lamps are closer to 250W, but the element will draw a
lot more than that when it's cold.

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