开云体育

My 8643 failure message indicated 5V supply failure. Voltage at test point measured 4.9 volts. I replaced all the capacitors in both switching supplies of the 8643A. Both supplies checked out OK before capacitor changes, and OK after capacitor changes. But I'm happy it has new capacitors.

?

The battery voltage was OK, but being old and not interested in leaks, it has a new set of 3xAAA in little plastic holder.

?

After reading about tinned Molex connectors developing voltage drops I sprayed DeOxit on pins of the power supply connector, and both input and output connectors of the power filter board. And of course the cable pins that plugged into those connectors. Power supply and filter board input connectors were tinned pins. Pins on the output end of the filter board were gold. Did the best I could, but it wasn't as good a job as I would like to have done.

NONE of the connector bodies were discolored. There was maybe 1/4 volt drop, and not that many hours of use, before I took it apart. Probably not enough time and heat to discolor the Nylon.

?

Applied power, and test point now measures 5.10 volts. So looks like it was voltage drop in the tinned Molex connectors. ?No error message. While I haven't checked exhaustively to verify everything is working, but I expect it's OK again.

?

THANK YOU GUYS FOR POINTING TO THE CONNECTORS

?

Regards - Bill W7AAZ