520ST+ with external floppy(SF314) floppy reading issues

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saulot
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520ST+ with external floppy(SF314) floppy reading issues

Postby saulot » Wed Jul 10, 2019 10:45 am

Hi, recently I've bought external floppy for short 520ST+, but it seems that it got troubles with reading floppies (led flashes like it should during startup, drive engine is spinning when it should), drive is detected (A/B floppy icons are present in desktop). Unfortunately it cannot detect if disc is inserted or not. It doesn't look like external drive issue, because it works fine with other mega 4.

Anyone knows how to diagnose where the problem is and what to check? Maybe ym2149 is faulty?
Last edited by saulot on Wed Jul 10, 2019 7:18 pm, edited 1 time in total.

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Re: 520ST+ with external floppy(SF354) floppy reading issues

Postby Zogging Hell » Wed Jul 10, 2019 6:27 pm

I remember having a similar issue with a SF354, which turned out to be a component had broken (a reed switch iirc). Might be a similar problem to yours, as there are two of them, one for the write protect and another which does who-knows-what. Certainly worth opening up the drive as it is simpler mechanically than later models. This was the rubber belt driven drive, however, if you have a more conventional single sided floppy I am out of ideas.

I tracked down the thread here... (the search on here is a right pain, I can never find anything)

viewtopic.php?f=15&t=22308&p=198001&hilit=sf354#p198001
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saulot
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Re: 520ST+ with external floppy(SF354) floppy reading issues

Postby saulot » Wed Jul 10, 2019 6:56 pm

Thanks, but drive works on other st fine, so i suspect it's 520 st problem.

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Re: 520ST+ with external floppy(SF354) floppy reading issues

Postby DoG » Wed Jul 10, 2019 7:10 pm

Is it set as ID 0 or 1?

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saulot
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Re: 520ST+ with external floppy(SF314) floppy reading issues

Postby saulot » Wed Jul 10, 2019 7:18 pm

It's external so I guess if there is no other drive connected then is treated as 0. No? I didn't open it, no one has opened it, so it should be in default state.
Sorry, I've made mistake in drive type, it's SF314 (double sided)..


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