HP-41 - port not working

[Diego Diaz]

Hi Andi,

Some pics of the disfunctional port would be of some help to check for contact tracks misalignment.

However, Ports 3 and 4 share the same internal wiring in the Flex PCB, therefore it is very unlikely that loose post screws may cause the problem as you've described it.

Apart from ROM modules, does the problem happen also with non-addressable or fixed addressed modules? (e.g. X-MEM, TIME, PRINTER...)

Is the calc an HP-41C? If so, please check if it also happen with Memory Modules (or the QUAD)

Check if plugging the module and taking it out by just one millimeter makes any difference.

Also, narrowing the gap between the module's contact may fix the problem. Even if this module works as expected when plugged into a different port. It may worth a try.

Best regards from Canary Islands