I'm having a problem with a Canon PIXMA iP4000 printer not powering up. It had been working perfectly but has refused to power up.
I have the power supply out and the primary side of the switch mode PS is fine and the two output feeds are 8 and 10 volts. I have read elsewhere that pin 5 of the output connector brings back a low voltage (3volt?) that tells the PS to increase these outputs to the rated 24 and 27v.
I haven’t traced this sense circuit yet but presume that it is not supplying the required “bias”.
Can anybody help with any experience as to common problems with this sense wire’s circuit, or where I can get a schematic?
(BTW the power board has 2 numbers on it, PS-A126 and P1222)