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?

John