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Brian,
you are too kind, I’m only musician, my knowledge of electronics is limited, despite my ability to do simple repairs. And I’m far from wisdom even when I became 60 this year :-) (Maybe because I don’t feel so old.)
I would measure voltage on RAM chips when instrument is off.
Checking the diode D4 is highly recommended, but when diagnostics showed proper voltage, probably it’s OK, isn’t it?
I would also check or replace tantalum cap 10/16 connected parallel to battery pins…
I suppose the battery polarity is OK...
Good luck!
Daniel Forro
> On Sep 4, 2018, at 10:40, Brian [email protected] <mailto:[email protected]> [YamahaDX] <[email protected] <mailto:[email protected]>> wrote:
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> That sounds like the diode might be blown.
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> Have a search through the files here for diode replacement or battery change.
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> Daniel in his infinite wisdom may be able to help. 😊
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> Brian.
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> From: geoff baltan [email protected] [YamahaDX] <mailto:[email protected]>
> Sent: Tuesday, 4 September 2018 6:39 AM
> To: [email protected] <mailto:[email protected]>
> Subject: [YamahaDX] DX7 Memory Corruption
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> Hi All -
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> I recently managed to get a semi-broken down DX7, first make and
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> model. The battery needed to be replaced, which was not too much
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> difficulty. The presets were wiped, but I ran the internal diagnostic
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> check and everything seemed to check out.
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> I have started programming new presets and storing them in the
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> internal memory...but the internal memory seems to "forget" after a
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> few hours of the machine being turned off. I'm wondering what might
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> cause this problem.
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> Thanks,
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> Geoff
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