David,
Thanks for the follow-up.
First and foremost – I was not sure the printer caused the prior two outages.
I was responding to the posting, moving it to cover the possibility
and was commenting on my observation
– that after it was securely plugged into the UPS (while turned off)
and then was turned on, then the UPS fired on.
Presumably the UPS considered the surge of it starting a potential circuit problem,
and went to battery in order cut off the devices from the circuit to protect them from the surge.
Everything else I had on UPS – computer, monitor, and a desktop USB hub was on
– the UPS happily kept those going
– and then after <30 seconds, it turned off battery, putting everything back to circuit.
[My UPS is also 1500 VA and relatively new]
That was the point at which I wrote my email and then read yours.
I subsequently left the printer in deep sleep for hours, used the computer without any problem,
and that time the UPS was its usual silent self.
I sent the printer a single page to print.
– and got the exact same response from the UPS
– including the UPS turning off battery mode even before the page started printing.
So all that fits your information exactly
– that the issue is the (very transient) surge of current required to get the laser printer ready to print
I took the printer off the UPS, connected directly to the same circuit,
with nothing else changed,
sent it the same page to print
and it printed – with no disruption of the circuit, no response from the UPS,
no effect apparent on my computer.
I conclude in my case it is not the printer that caused the circuit breaker to trip previously
There are other things on the circuit but nothing has changed from long before the first incident.
Regarding the circuit,
– it has a regular 15A circuit breaker – not AFCI
– essentially all the wiring in that circuit is new
– the breaker might be >10 yr old
I am inclined next to simply replace the circuit breaker.
– low cost, technically straightforward
Now ordered from Amazon.
One detail I’d appreciate your thoughts on
– would replacing the 15 A breaker with a 20A breaker be reasonable way to proceed
if one concludes that this very intermittent problem
is simply being triggered by another device with an intermittent surge demand.
The wiring is new, but it is 14G not 12G,
so I can easily understand the response could be “No, not reasonable”
Thanks for articulating your concerns about the stress on the UPS and pushing me to do more formal testing.
I was indeed a bit uncomfortable at the idea of the UPS jumping so, every time I printed even a single page.
Best,
Bob