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Re: Recapped PowerMac 8100 PSU and now unstable
So I pulled that cap and some of the blue ones and the other larger gray box one as well. My ESR meter couldn't read them because they are just too low capacitance (0.1µf, etc), but my DMM at least verified their capacitance to be good. As for the high ESR reading, that was in-circuit and it was misreading as the capacitance reading was off as well.
Should I just shotgun replace some of these? I'll keep pulling the filter caps up to and including those around the massive ones.Comment
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Re: Recapped PowerMac 8100 PSU and now unstable
no, check the 2 big filter electrolytics next.
i know you replaced them - but i dont know what withComment
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Re: Recapped PowerMac 8100 PSU and now unstable
I’ll do that. One thing also to remember is this problem existed prior to my changing out the caps. The problem existed 20 years ago when I acquired the machine, I just never got around to it till now!Comment
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Re: Recapped PowerMac 8100 PSU and now unstable
Sounds like maybe the PSU temp is too high. (or a thermal sensor problem)ASRock B550 PG Velocita
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Re: Recapped PowerMac 8100 PSU and now unstable
Re CX1, measuring its capacitance in circuit will include any other X caps in parallel with it. So, for example, if there's a .47uF that is also across the AC line your .1uF cap will measure ~.57uF.PeteS in CA
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Re: Recapped PowerMac 8100 PSU and now unstable
caps across the line usually have a parallel discharge resistor too.
that will make it read higher.Comment
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Re: Recapped PowerMac 8100 PSU and now unstable
I took that box cap out and it tested fine. Now, I have removed the blue disc caps and tested them out of circuit with the DMM, and they all test within tolerance for their specified capacitance. They are all far too small to test ESR. I tested the large filter caps, both published at 680µf, both with 0.17 ohm ESR, one 601µf, the other 592µf, so all around good. I also took out and tested the thermistor within the circuit...It appears to be rated for 7 ohm (it is 15SP M007), and tests at 11 ohm.
I can test more ceramics as I go, but I m running out of ones to test at this point.Comment
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I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles... -
Hello!
First want to thank folks on this forum (Toasty, etc) for the very useful info I've found here that has allowed me to repair a PowerMac G4 MDD Samsung power supply and get this ACBel one working better!
I got a PowerMac G4 MDD for free as it was dead (not booting at all). I was able to confirm it was it's ACBel power supply as another (above mentioned Samsung) power supply works ok with the system.
With this ACBel power supply installed, the system would not boot at all, no power light blink, nothing. I've gone ahead and replaced the "12... -
I bought this switching supply power a few months ago but did not have time to do anything but now because of being in between jobs I now have time for projects that were waiting for me to have time to do them
What do think about this switching power supply pictures are below
One note theses pictures are after I had recap this power supply
The capacitors were actually not that bad ESR value wise expect for a couple of them low UF value under 100 for non brand name capacitors
One other note I moved the indicator LED light to the outside of the... -
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
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