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Inside the HP-41CX halfnut

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This HP-41 CX was opened to fix broken screw posts. This is a common problem for this series of calculators.

Lots of articles can be found on the web explaining how to disassemble this type of calculator.

To open the housing a crosshead screwdriver is needed. The four screws are hidden behind the rubber feet. After removing the screws the housing can be opened.

HP41CV_repair_1 HP41CV_repair_1

 

The pictures above show the interior of the HP-41 CX halfnut version. The left picture shows the large printed circuit board which contains all electronics. The HP-41 CX has an additional print soldered on the main print. This print contains the additional memory.
The picture on the right shows the back side without battery holder and connector which connects the batteries and interface modules with the main printed circuit board. The buzzer is glued to the back. To separate the two halves, the wiringto the buzzer were de-soldered.

 

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HP41 repair related links:

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