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41C won't power up



#4

Fresh batteries. No corrosion or stain. No activity. Any suggestions?


#5

Open it up (screw under each foot) and clean all the internal pressure contacts (battery and CPU board) with 91% isopropyl alcohol.

Check for broken screw posts and bosses under the battery contact assembly. Fix with plastic welding solvent (from a good hobby store).


#6

First try a memory reset. This is the softest possibility with which I could restart some HP-41.

Matthias


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