On Mon, 4 Mar 2019 16:28:59 -0000, you wrote:
So far I'm getting nowhere fast. I'm tempted to remove Q1254 (which will prevent the inverter stop signal from shutting the supply down), and using a 200W dim-bulb on the mains input to limit the current draw (supply is rated at 215W).
ok, limiting is your friend here.
I think this will force the supply to come up and blow out the component in the mainframe that's stopping the supply from running.
That's mean. It'll work, but not sure about the collateral damage.
Since you have storage scopes, have you any idea of which supplies are
causing the problem? Can some of the supplies be run independently?
Do you, for instance, have the ability to disconnect the 5, and say
+/- 15 volt supplies and just use the scope's 50 volt supplies? (and
anything higher). A lot of this would be dependent on the design of
the motherboard stuff.
I take it you disconnected all the boards, and then connected them
back up one by one?
First thing I'd do is disconnect the high voltage section. Then
vertical, horizontal and sweep sections. At this point, you shouldn't
be able to damage the CRT, and might be able to figure out what's
going on.
You've probably thought of this already, though.
Harvey
What do the mavens here think of this somewhat brutal approach?
Thanks
David
