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  1. Replies
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    Thank you, I'll do that. The chopper transistor...

    Thank you, I'll do that. The chopper transistor on my PSU was a BU508A, and the one I replaced it with is a BU508AF. They are indeed not the same.. Having looked more closely at the specs. They are...
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    61699 I did some more testing, and as far I...

    61699

    I did some more testing, and as far I can tell they are checking out good so far.

    EDIT: And I was mistaken, it was not the chopper I had asked about. Sorry about that. There is a lot to...
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    61698 So, I'm assuming the one in red is...

    61698

    So, I'm assuming the one in red is busted. It measures nothing from base to emitter. It sohuld be .65v I suppose :P
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    I'm checking the components, as best I can, on...

    I'm checking the components, as best I can, on the primary side now. Regarding the chopper I tried to find one that match, and asked here if it would be a good replacement, however I was unable to...
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    No, I Charles Bronsoned it and just started the...

    No, I Charles Bronsoned it and just started the PSU without testing transistors or diodes. I ordered several of these choppers (etc), but it might still might have been a vulgar thing to do.
    I will...
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    I just put in a new chpper transistor and bridge...

    I just put in a new chpper transistor and bridge rectifier. The PSU powered on, whining and buzzing for a couple of seconds before the fuse blew again. The new chopper has shorted.
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    9V AC measured at 11.7 V (no load, obviously :P)...

    9V AC measured at 11.7 V (no load, obviously :P) Seems high to me, but what do I know.. Is it too high?
    Both fuses are OK.
  8. Replies
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    I should probably leave the chopper transistor...

    I should probably leave the chopper transistor out as well, as it's faulty, or should I leave it on for the test?
  9. Replies
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    Sorry, but I'm having a hard time finding a...

    Sorry, but I'm having a hard time finding a replacement for BY179. I suppose I could just replace it with some diodes, but a nicer solution would be better.
    BY179
    Would this one work?
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    :D Oh, I've been suffering from that since...

    :D



    Oh, I've been suffering from that since I was a teenager, but I've been remarkably lucky in that I've only ever had to recap motherboards, change ram-sockets/chips and program the odd...
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    I understand the confusion. What I wrote was...

    I understand the confusion. What I wrote was "someone much more competent then me". Not an expert, but someone who regularly brings old commodore-machines back to life. PSU's might not be within his...
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    I'm on it! Putting together a mouser cart as we...

    I'm on it! Putting together a mouser cart as we speak. This is exciting :)
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    Well, that's a shame! I was hoping that this...

    Well, that's a shame! I was hoping that this would most likely be the only problem with it :) Well, at least it's something! At least these two components need changing then.
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    Ok, I had another look at it and now I have it in...

    Ok, I had another look at it and now I have it in a holder and I do indeed measure just over 0.5v. There are four pins, -~~+, measuring - ~ = 0.06v, -~=0.5v, ~~ = 0.5v, ~+ = 0.06v, +- = 0.5v and +~...
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    Thank you for that post, Hugo! That was very...

    Thank you for that post, Hugo! That was very interesting. I'll get on that as soon as I figure out where the bridge rectifier is. :D
    I was in the process of testing tracking the signal when I read...
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    I had someone much more competent have a look at...

    I had someone much more competent have a look at it today, and it seemed to him that the power transformer was shorted. He had a pretty thorough look at it, but said that he had no such transformer...
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    I have a hard time knowing where to start with...

    I have a hard time knowing where to start with this comment. But I'll give it a try:
    I never intended to imply that the caps had continuity, but that there was continuity between positive and...
  18. Thanks for the suggestion! I've been...

    Thanks for the suggestion! I've been experimenting with nuts and bolts etc. today and I think I might have managed to get things level so that all the cards make good connection. One large nut, one...
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    I've picked up a replacement choke today and...

    I've picked up a replacement choke today and yeah, that didn't solve the issue.. So I guess I WILL have to get some help with this.
    @iz8dwf there was no burn marks actually. I would have taken a...
  20. ISA cards don't make contact with motherboard in my AT cases (486 motherbaord)

    Hi there,
    So I've been having an issue. I have a 486 build that I'm trying to put together but I can't find a case that fits. It's a regular AT motherboard and all regular cards, but the motherboard...
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    Well, I've wirejumped the connections left open...

    Well, I've wirejumped the connections left open when i removed the choke of course. If I didn't I wouldn't know if removing the choke fixed the problem. The choke had continuity between all pins. I'm...
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    Yes, the PSU should work without the filter, and...

    Yes, the PSU should work without the filter, and it might stricly not be needed, but I don't feel comfortable just leaving it out and wirejumping those points on the PCB. The filter must have been...
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    I've been poking around and desoldering...

    I've been poking around and desoldering components. First the big 385v 100uF capacitor, still continuity, then the other smaller capacitor on the highV side (50v 10uF), still continuity, and finally...
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    Yes, but when I unplug the PSU from the...

    Yes, but when I unplug the PSU from the motherboard it still blows a fuse. I've been poking around with the multimeter to test for continuity and to my surprise found that there is continuiti between...
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    My C128d (plastic) just died and I need help

    Hi all,
    My beloved C128 just died. It's the first computer me and my brother got and it's been with me all these years. I was playing around with it the other day and it suddenly just died. I heard...
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