Hi all, My 5061A has failed and I've isolated the problem to a faulty A18, the +3500 volt ion pump power supply.
The existing one has almost certainly has had the internal 200M resistor go open as the output voltage is about 5 kV and it does not decay quickly when the power is off. The output voltage to the current sensing circuit is 0. I have a replacement which I suspect is faulty - when energised from a +18 volt source it only produces 2 kV which decays quickly and the sensor output is +20 when the thing is unloaded. That 200M resistor may have gone low! Is this one worth installing ie: will +2 kV pump enough ions? So I'm looking for a replacement or advice from anyone who may have attempted to repair one. If anyone has a parts donor of course I'd be happy to pay appropriately including shipping down here to Australia. Morris _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
