Hi folks.
I'm replacing a sticky relay on a power saver socket but the problem seems to be on the control side. It's 230v AC and the logic side uses a switching regulator IC to provide 5v DC for control; This in turn provides +5v to one side of the relay to energise, but what is confusing me a bit is that the -ve side of the relay is connected directly to the Neutral AC rail. The main problem I am getting is there is +5v DC to the relay when ON, but 2.5v AC to it when Off. This seems enough to hold the relay on providing a fault.
Smoothing caps have now been replaced as originals had vented, but I feel the fault lies elsewhere.
Rectifier diodes seem ok when checked off board at low volts, but is it possible they fail at high potential allowing leakage?
Many thanks, and an excellent forum btw.
I'm replacing a sticky relay on a power saver socket but the problem seems to be on the control side. It's 230v AC and the logic side uses a switching regulator IC to provide 5v DC for control; This in turn provides +5v to one side of the relay to energise, but what is confusing me a bit is that the -ve side of the relay is connected directly to the Neutral AC rail. The main problem I am getting is there is +5v DC to the relay when ON, but 2.5v AC to it when Off. This seems enough to hold the relay on providing a fault.
Smoothing caps have now been replaced as originals had vented, but I feel the fault lies elsewhere.
Rectifier diodes seem ok when checked off board at low volts, but is it possible they fail at high potential allowing leakage?
Many thanks, and an excellent forum btw.