Electronics > Repair
Metcal STSS-001 RFG-30 Disassembly and Measurements
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Jamieson:
The saved-from-the-trash STSS-001/RFG-30 power supply was fixed yesterday. The problem turned out to be the 5k pot VR1 on the power supply board. Normally this would be used to bias/adjust the FB signal and control the PWM chip. The pot failed open (oxidation?) and the FB signal was no longer in the correct range to drive the PWM controller, so it shut down shortly after power up. I would see V4 momentarily bump up to ~5V then fall back to zero. With a new 5k pot installed it fired right up and I used one of those Metcal inline power meters (also from the trash!) to adjust the idle power to about 5W.

Ernest1:
Wow that's really cool. I have one too. With the sttc 136p tip I can see it drawing 80 watts from the wall. Would you be able to test that with your tester to see how off it is from what its pulling at the wall? Also mine has H1 handle which the rubber disintegrated on and I used some tape as a grip in the meantime. I also don't have a stand for it, I'm thinking of designing one up similar to jbc and 3d printing it. I want it to have a internal sponge and compartment behind it which keeps lead dross and can be dumped. Also a silicone barrier so the solder doesn't come out during transport or splatter with copper sponge and a soft tapping spot.
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