LiveBrianD, on 13 March 2012 - 07:00 PM, said:
How much time does that printer take to warm up though? Oddly, this printer is rated for 38W sleep, 100W ready, 515W copying. The sleep figure is a bit high, the ready one is about right, and the copying one.... more like an average.
I did a quick test with one page. I connected the printer to one of the battery ports of my APC UPS that has a built-in "watt meter". Prior to the printer being plugged into that battery port, there was about 10 watts being used by the devices connected to the batter ports (my router, my cable modem, a desktop phone, and my Vonage device). After I plugged in the laser printer, about 17 to 18 watts was being consistently drawn, which is consistent with HP's 8 watt value for standby/idle. When I then printed one page, it took about 5 to 10 second before the printer starting the warm-up and print process (the processor in that printer is OLD and SLOW, so it can take a while for the process a file for printing) at which point the watt level jumped initially very briefly to about 500 watts, but very quickly leveled back off to about 250 to 300 watts (higher than the 175 watts that HP said). It took about 10 seconds for the whole warm-up, print, and wind-down process to complete at which point it went back to only 17 to 18 of watts being drawn (only about 7 or 8 of that the printer). So, all told, my printer was using about 250 to 300 watts for about 10 seconds (remember only one page) and then rest of the time was about 8 watts. FWIW, the laserjet 6MP is listed as "Energy Star complaint".
When I have time, I will do a test by printing several pages. Doing only one page definitely resulted in significant variation as there was the initial spike for the warm-up. It will interesting to see if the wattage stays more level for a longer printing job.
The end result is that my printer has a VERY short high wattage draw...only for the time to actually print...and it seems to warm up very quickly...it was about a second or two from the time that the processing by the printer completed and the warmup (and wattage spike occurred) and the page of paper started to be pulled from the tray to complete the print process. For an rather old printer, it seems to be rather energy efficient...but it is SLOW...only 8 ppm.
FWIW, here is the performance "specs" for the LaserJet 6MP:
Note that for warm-up time it says "instant-on" fuser...which is consistant with my test.
Good riddance PCWorld.