Fixed: Philips PM 3355 hybrid analog/digital oscilloscope. Data acquisition board suffered damage from leaking capacitors, including a broken trace that took some diagnosis and circuit analysis to find. Oh and the power supply was bad, too. Oscillating frequency pulled into the audible range by a bad RIFA, that did not blow.
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Fixed: Monochrome MDA monitor. I figured the screen voltage G2 would be too high, or the focus voltage G1 gone. And sure enough, a cable to the neck board was loose. Broken solder joint.
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The second channel of my workhorse analog scope went out. I figured it'd be a simple fault not worth talking about (it was). But opening this thing to get to the input stage is a pain and a half.
I keep it around as a burner, where I can blow up the input stage on accident and fix it with readily available parts. Unlike other vintage oscilloscopes that use unobtainable custom hybrid ICs or my modern DSO that would be a paperweight then.
I keep it around as a burner, where I can blow up the input stage on accident and fix it with readily available parts. Unlike other vintage oscilloscopes that use unobtainable custom hybrid ICs or my modern DSO that would be a paperweight then.
First you have to pull off all the knobs and also desolder a bunch of wires. Yes, desolder. There is no connector.