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Hi All I also would very much like to source the pain in the UK, ?the blue paint on the ?2XXX series appears to be water based and cannot even be washed with water without if coming off. 73 George

In that case Dave, what about sourcing the pigment in liquid (tube) or powder form...? That may be the shot. Jack

Has anyone discovered a source of this paint in the UK ? Getting it from abroad is tricky because of postal regulations. Dave

Hi Fred, We share a love of the 7854. I have a few troubleshooting related questions and suggestions of my own: It sounds you have isolated the problem to the display board. As Raymond Domp Frank

Albert, This is fantastic. Thank you so much. It's exactly the sort of thing I needed to know and it really gives me something to compare mine with. I also see the funny overshoot on output B - I

I am at home and have neither a 7854 nor a service manual available. So, just a question and some wild guesses: 1. Can you get an idea about the frequency of the jitter? That could give an indication

Just one more observation, if I disconnect the display board coax outputs from the horizontal and vertical amplifier boards. the readout is just a very stable point in the center of the CRT without

Hi Fred, I don't remember which circuitry (DAC and so on) is used in common to display stored waveforms, text and Readout. The fault in your 7854 seems to affect everything. Some further ideas. Is the

Hi Fred, I don't remember which circuitry (DAC and so on) is used in common to display stored waveforms, text and Readout. The fault in your 7854 seems to affect everything. Some further ideas. Is the

Hi, during work, all of the sudden my 7854 started to show jitter of the readout in the horizontal and vertical directions. In stored mode the waveform is jittery as well, but in scope mode the

Hi Chris, Yesterday I looked only at graphs 4 and 5, but I think I read these in the wrong order (or interchanged the TPs). Hence the purpose of C114 is the opposite of what I thought, this cap speeds

Albert, Thank you for these ideas. I'll check the relationship between TP106 and TP109 when I'm back in the office on Monday. The waveform I see at the base of Q546 is odd: it's a sort of castellated

Hi Chris, The hold-off multivibrator "looks like it's working". Did you check the waveforms at TPs around U110? The waveform at TP109 should be the inverted version of that at TP108 as shown in graph

If you search here for "7k extenders" you will get lots of hits. Among these those produced by John Griessen. Albert

There are mine that use 24 gauge single wires but I just ran out of custom connectors, so that needs a waiting list again, or maybe it's time is up... Then there are some extenders by Dan Meeks sold

I seem to remember someone talking about plug-in extenders - were they for the 7000 series ?? If so are they still available ? Dave

Is there anyone here intimately familiar with the internal workings of the 7T11 plugin? I ask because I'm trying to get one to work. The symptoms are that there's no trace visible on the screen. I had

Just a thought... It doesn't have to be a huge voltage, if it's at a high frequency. That 300 V RMS probably applies only to low frequency signals. The maximum allowable voltage is usually derated

Thank you, John, for the mention. For anyone looking for replacement scope feet, I would also add that I can supply them for a number of different scopes. They're available both on eBay and at a

That is what I've done and how I found the defective parts and fixed it. The link to the Tek forum with pictures was in my opening post. https://forum.tek.com/viewtopic.php?f=505&p=286211 There is no