lmcclaf writes:

Can you specify the model number of your Casio? That might spark a
light for someone that might have a non-working unit in their parts
box.

I'd suggest revisiting the 30 gauge wirewrap wire solution. That's
got to be easier than soldering 50 connections that are less than
1 mm apart!

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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