Does anyone have a spare HV PS board (just the small board with the xformer and the two diode ladders in silicone potting) for an FTS 4060? My +3kv circuit seems to have died and the board is not easy to repair due to the potting. BTW, I did find that the board is not as hard to remove as it looks. Here is my procedure: 1) Remove the hex socket screws that hold the cesium tube assembly onto the outer chassis. 2) Detach the ribbon connector from the main PS board. 3) Slide the chassis out a few inches on the bottom side of the unit. (You may have to disconnect the distribution buffer assembly on the top side first). 4) Unscrew the two high voltage connectors and the plastic connector with the two orange wires (BTW, if anyone knows how to detach that connector please let me know - I ended up unsoldering the wires from the PC board). 5) Slide the whole power supply board out of the cesium assembly. 6) Remove the two screws and detach the small HV sub-board from the main PS board. Voila! I would be happy to send PayPal for item and shipping to Colorado. Thanks! Jim

Jim the potting is a pain. But if you decide to dig in, carefully pick/clean out small bits at a time. In my experience little bits come off and you can start to see if you are getting into trouble. If its anything like Tektronix HV supplies they are very repairable after dealing with the potting. Regards Paul On Fri, Nov 15, 2019 at 12:41 PM AC0XU (Jim) <James.Schatzman@ac0xu.com> wrote: > Does anyone have a spare HV PS board (just the small board with the > xformer and the two diode ladders in silicone potting) for an FTS 4060? > My +3kv circuit seems to have died and the board is not easy to repair due > to the potting. > > BTW, I did find that the board is not as hard to remove as it looks. Here > is my procedure: > > 1) Remove the hex socket screws that hold the cesium tube assembly onto > the outer chassis. > > 2) Detach the ribbon connector from the main PS board. > > 3) Slide the chassis out a few inches on the bottom side of the unit. (You > may have to disconnect the distribution buffer assembly on the top side > first). > > 4) Unscrew the two high voltage connectors and the plastic connector with > the two orange wires (BTW, if anyone knows how to detach that connector > please let me know - I ended up unsoldering the wires from the PC board). > > 5) Slide the whole power supply board out of the cesium assembly. > > 6) Remove the two screws and detach the small HV sub-board from the main > PS board. Voila! > > I would be happy to send PayPal for item and shipping to Colorado. > > Thanks! > > Jim > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. >