Yep, set for 120 VAC.? I did move the jumper to Mid voltage.
I will try a night light in series as soon as I can.?
Thanks, Jeff
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-------- Original message --------From: Jeff Urban <JURB6006@...> Date: 6/24/18 10:11 PM (GMT-08:00) To:
[email protected] Subject: Re: [TekScopes] Dead 7603
That model, if the graticule lights work you got juice to the Xfmr. Other lights are a different story. If you get absolutely nothing, turn it on and see if the blades of the power plug read infinity between. If so it is either the primary of the transformer or a thermal in it, or maybe something to do with the voltage selection. You DO have the voltage selector in properly right ?
It is rare for a primary of a power transformer to open up. But on any given Tuesday a connection could be defective and it didn't show up. If you get an open reading find the actual primary and measure it. Maybe stick 120 VAC in it through a 100 watt incandescent.
If your main low voltage supplies are all there you should check for HV, and it is not like that requires a HV probe, there are places to measure where you can tell. The cathode voltage is only about 3KV, so even if it goes overload on a DVM that can handle 2KV it shouldn't hurt it. if it has HV then go to the deflection plate voltages, just because it is easy. The ones on the top should be within a few volts of each other, same with the side ones.
After that you might need to go to the CRT grids.
Whatever, if it does absolutely noting that is usually a good omen. If it is just something stopping the 120 VAC from getting to the iron, that is easy. (unless you need the transformer, but sometimes it is a thermal cutout and that can be replaced. Usually.
Keep us posted.
