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This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

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Why do we have this policy? Sending a "PM Sent!" type message basically wastes everybody else's time by making them having to scroll past a post in a thread that looks to be updated, when the update is not meaningful. And the person you are sending the PM to will be notified by the forum software that they have a message waiting for them. Look up at the top near the right edge where it says 'Notifications' ... if you have a PM waiting, it will tell you there.

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New user moderation

New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.

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Other suggestions
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Compaq Portable 386 PSU burn

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  • mdx
    replied
    Originally posted by george View Post
    Check FDD cables (power & data), check for stable +12V when FDD is accessed, check the fdd mechanics and if necessary clean and lubricate heads positioning mechanism.
    Good point about power stability, since I had trouble with the PSU already. Some of the larger capacitors in the PSU are outside the range of my meter so I couldn't check them. If it's not the power supply then I will just replace the floppy drive and see if it helps. I have some spares lying around. (I am currently trying to get an IBM P70's floppy drive to work again so I don't want to spend too much time on this 'standard' one...)

    Thanks, I'll report back soon

    Leave a comment:


  • george
    replied
    Check FDD cables (power & data), check for stable +12V when FDD is accessed, check the fdd mechanics and if necessary clean and lubricate heads positioning mechanism.

    Leave a comment:


  • mdx
    replied
    Hi All,

    just an update. I replaced the parts and everything seems to be working again. Here are some pictures.

    DSC_0260_scale.jpgDSC_0264_scale.jpgDSC_0268_scale.jpgDSC_0272_scale.jpgDSC_0343_scale.jpg

    Now there is one more problem. When booting, sometimes (but not very often) the compaq will show error 601 (floppy controller error).
    Any suggestions welcome ofcourse

    Leave a comment:


  • mdx
    replied
    Never mind about the values, I was able to read/google/measure them. R8 is 1kOhm Vishay FP3 3W/500V, CR3 is MUR 480 4A/800V. I will try to replace these with similar high power parts...

    I am still interested in any ideas on why this might have happened and in the schematics in case I end up frying more components...

    Leave a comment:


  • mdx
    started a topic Compaq Portable 386 PSU burn

    Compaq Portable 386 PSU burn

    Hi All,

    I have a Compaq portable 386 that works perfectly. Well, except for the fact that it started smelling burned a few days ago. I took everything apart and found inside the PSU some parts with burn/melt marks (R8 and CR3, mainly.)
    Any ideas as to why this suddenly started and what could be done to cure it? The fan is running fine.
    Does anyone have schematics for the PSU or at least the values for the parts? (at least CR3 looks like it should be replaced, even if the whole things still runs.)

    Any help appreciated!

    PS: I can upload some pictures of the parts later if that helps.
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