Canon powerswitches

[stevena86]

I'm doing a DIY project in which I want to use a power switch that will automatically switch itself off when power to a system is shut off. I know on the Canon IR Advances they do this exact thing, but how do they do it? What kind of switch do they use? Is it a switch that has a magnet it in that when power is lost it release and the switch is flipped back to the off position? Is it done via a solenoid that pushes the switch back to the off position when the machine is shut down?

If anyone can clue me in to how they do it I would appreciate it.

Thanks.

[blackcat4866]

Re: Canon powerswitches

Many Canon and Toshiba power switches both do this. Typically they are DPDT switches with a 24v solenoid to kick it off when desired. It can't turn itself back on once it's off. So you've got +24vdc steady to one side of the solenoid, then a momentary pulse of ground from the controller board to the other leg of the solenoid, to kick it off. Solenoid voltage may vary based on specific model.

I remember when we would get fuser or lamp errors on Canons, we would hold the switch On to get into service mode. =^..^=

[stevena86]

Re: Canon powerswitches

Thanks very much, that was what I was looking for!