I recently repaired a 38C with a corroded battery connector
by soldering a couple of wires onto the circuit board and attaching them to a battery holder in the battery compartment. The calculator now runs on two 1.2V NiMH rechargeable cells. I now find that sometimes some of the display segments disappear (for instance, the top segment of every digit may be missing), but that I can make the display return to normal by squeezing or twisting the case a bit. Does anyone have any idea what might be causing this? Also, would it be fatal to use 1.5V cells?
HP 38C repair
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