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If the +130v supply is good, check the voltage on Q173's base. It should be 82vdc. If it is low check C171 for leakage. If C171 is OK, check CR177, CR173, and Q173 for leakage and shorts. Then check

I use Circuit Works CW2500 epoxy to repair traces on a PCB and overcoat the result.? Its a good epoxy but somewhat expensive.? All epoxy "glues" will melt when soldering so plan accordingly.? In

Good warning. Thanks.

OK Harvey, I did as you suggested, putting a V and H plugin. Here the results: 1) Trace is moveable in both horizontal and vertical position. So I put the trace off-screen to avoid CRT damage. 2)

Check to see if the astigmatism control works, if focus works (do

Oh dear - the dreaded one pin out problem. We've all done that at some point. I've got away with it until I did it on my 577 curve tracer and took out most of the silicon. Fixing it is a "work in

O.K. I checked power rails and found a short on -15V, pin 7 of P82 connector (sense). NOTE: some other people was attempted to repair this poor 7854, so...they left behind a disaster with no success.

Silicone will rip with mechanical stress. Epoxy is much stronger. Regards, Mark W7MLG wrote:

cheater cheater wrote on 5/4/2019 10:15 AM: Hello-- Do you have automobile-supply stores in Austria such as this one... https://www.autozone.com/ <https://www.vipauto.com/> If so, you might

I really don't understand this insistence on 'high temperature' epoxy, as I said, re-seat the connector and if it has no retention itself then clamp it or put a bit of epoxy away from the solder area

With the 76xx series you do need a dual timebase plugin, since there are only 3 slots. You're mixing up the letters. For 7000 series, the nomenclature goes as follows (not all inclusive) and there's

Overload. You had bad caps on the pow

Hi A regular ticking means that you have a short on one of the power rails in the mainframe. George G6HIG

Good news! I found another couple of leaky electrolytic. So I decide to change ALL electrolytic capcitors on inverter and control/rectifier board, using Nichicon PWM-R 105 deg (low ESR). Replaced the

That's the plan, unfortunately I can't find an acceptable source of high temperature resistant, electrically insulating epoxy in Austria. The closest is in Germany, but that's still 10 euro shipping.

John and Harvey, this really great information I wish I had BEFORE I got started acquiring stuff (though all is not lost). To be clear, in terms of acquiring additional scopes or plug-ins, today I

Aha! okay, it looks like the power pins are surface mount so there must be something designed to help add mechanical retention to the PCB as well? Either way looks like a real easy thing to fix as it

Glue it back - remove all debris first. After that I would reinforce the connections with a wire - solder onto existing traces. I'm thinking that there is a problem with the connector - why would it

Here you go! https://imgur.com/gallery/hlUeQKz

I understand Harvey how much work these SALES are. Yes, I also bought couple old scopes that are not gonna work as once intended, but it is fun to have them display something and show people that next