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Date problems with old digital Casio

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Tom-HK

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Date problems with old digital Casio

Post08 Mar 2017, 00:02

My SP-400 (module 75) has just gone weird. It spends all its life in a watch box and has been performing flawlessly until now. Today I noticed that the date was wrong and when I tried to reset it I noticed that all but three of the months are missing and the dates from 1 to 31 exclude all days with the numbers 6, 7 or 8. Given the rarity of the watch / module, this obviously strikes me as a devastating development and I am hoping that someone can tell me it's not all bad news.

Has anyone got any ideas about what is going on or whether it can be fixed? I have emailed Casio for advice but the last time I questioned them about this watch they told me they had no records of it, so I don't expect them to be of much help this time.
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767Geoff

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Re: Date problems with old digital Casio

Post08 Mar 2017, 00:51

I know, probably tried this but:

1) get a new cell.
2) remove old cell.
3) short the +ve to the -ve to ensure no remaining charge in system or let sit over night.
4) install new battery.
5) the battery cover has the letters AC and an arrow.
6) When the new battery is installed, short the AC battery cover to the point the arrow points to.

This should remove any confusion that the IC may have due to a static shock or low battery.

My HP01 had an absolutely bizarre display and I thought like you, OHOH :bang: but following the above procedure I resurrected it. I actually had to leave it without batteries for a few days too remove all residual charge in any of the capacitors.

Geoff

Is this the one?

http://www.haq.watch/Casio%20SP-400%20Gallery.html

Edited +ve and -ve (stupid autocorrect)
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Tom-HK

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Re: Date problems with old digital Casio

Post08 Mar 2017, 09:46

Thanks Geoff. I haven't actually tried anything yet. Was hoping for advice before cracking the thing open. The particular watch to which you linked is the right model, but it is one that I sold some time ago. The one that is playing up is a shiny, NOS, practically unworn version. I had been dreading the possibility that something unfixable had happened to the circuitry (after an admittedly impressive 37 years of service), but now I have hope. I shall try the method you suggest and report results.

Thanks again!
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Tom-HK

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Re: Date problems with old digital Casio

Post26 Mar 2017, 10:50

Well, it took me a while to get the new battery and to get around to installing it, but I have finally done it and the watch now works perfectly! Thanks again for the advice.

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