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Found these inside a non-working 71B
03-17-2018, 05:40 PM (This post was last modified: 03-17-2018 05:41 PM by Dave Frederickson.)
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RE: Found these inside a non-working 71B
(03-17-2018 03:32 AM)MikeSD Wrote:  Here is the FORTH Assembler Module. I can't see anything out of the ordinary. Wonder if there was some jumper that was present that got removed when this was cleaned up.

Anyway, when 1-7, 8 and 13 are used, the system won't power up. I'll be checking voltages tomorrow.

I believe Raymond made this observation, there's battery corrosion residue on the module. That needs to be removed with a vinegar solution or DeoxIT D100 (red). Check for any shorts between the pins with a meter. Also, its possible that the corrosion may have spread under the encapsulation and this is what killed the calc in the first place.

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What's U10? - Dave Frederickson - 03-15-2018, 03:43 PM
RE: Found these inside a non-working 71B - Dave Frederickson - 03-17-2018 05:40 PM

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