Cwlondon, that printer uses a two lamp system to heat and set the toner, it might be the power required for both lamps to start up draw enough current to disturb your stereo components.
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So the bad news is when I am printing it might continue to disrupt my DAC and preamp?
But the good news is that standby mode shouldn't give me a $200 a month electrical bill?
I would like to add a sub panel and dedicated line etc to this room but havent yet had the chance.
In the meantime, I have way too many appliances, given the limited wiring in our house.
Thank you both for ideas so far...
You shouldnt add $200 to your electric bill. Just remember everytime the fuser has to re-heat itself it will draw a lot of current. Try to save all your printing to 1 or 2 times a day. Once the fuser is warmed up the current draw drops significantly.
When you do the sub-panel make sure you 'balance' the current draw for each phase as best that can be done taking into consideration all the appliances you have and may get.
I have an HP laser printer on the same circuit as my audio system and have never experienced dimming of lights or any other noticiable effect. Nor have I ever seen this happen in any other setting. Your printer should not draw that much current. You may want to tighten your connections at the panel and at the outlets - sounds like you have a high resistance in the path feeding power, most likely in the path to the printer. If that does not prove to be the case and if the time frame allows for it, I would be very tempted to exchange the printer.
Your printer problem intrigued me so I measured the current draw of my HP. At power up, after being off for 12 hours, the peak current was slightly higher than 5 amps. This was the steady state current when printing. When not printing it dropped to about an amp. This is a rather large home use printer. I would not expect your printer to have a significanlty higher current draw. Compare this with an inrush current of 50 amps for my amplifier, with an operting current at my listening levels of around 5 amps. Similarly, a power on current draw of 25 amps for a vacuum cleaner and then an operating current of 10 amps. The vacuum cleaner and the amplifier do cause a very short momentary dimming of the lights at power up but the printer does not. This may put things in perspective. Hope it helps. Let us know what you find and how you solve your current situation.