How to fix an old HP41cx

[isanchez]

(06-09-2020 09:15 PM)brmarcant Wrote:  

(06-08-2020 08:23 AM)isanchez Wrote:  Hello,

I recommend the parts of http://www.thecalculatorstore.com

There are smart solutions for zebra connectors and many others. The new zebra design is incredibly simple and works very well.

For the back cover + IO connector problem, you will find a combined solution by sticking the IO connector to the back cover, this makes it stronger and avoids the weakness of screw areas. Also indenpendent solutions are available either for the screw areas or for the IO connector.

Reliable solutions for upper and lower posts, which are really the weakest design point of HP41 series.

I can say that, except for the display, you can find good solutions for any HP41 series at http://www.thecalculatorstore.com and at a reasonable price. I am not commercially linked to this portal, to avoid suspicions.

Kind regards

Ignacio

Thanks a lot Ignacio.

Not sure I understood about the combined solution of the back cover + IO. Can u clarify ?

I knew about the site and maybe I'll buy something, but first I want to understand if it's a contact problem and maybe just fixing all together correctly will make it restart working :-)

Hi,

yes I explain myself: The most frequent problem in HP41 series is the battery leakage that ruins the I/O port battery contacts. Due to the effect of the acid, in many times it also affects to the back cover plastic area around the upper screws heads, so it is impossible to screw them properly. In other cases this problem comes if you screw the screws too tight and break the plastic. In this case, when both are affected, then you can get a plain bottom I/O port (3D printed+flex) and glue it (I recommend E6000 glue) to the back cover. The plain bottom improves the contact surface and the glue effectivity. What you get is a solid union between the I/O port and the back cover, and the screw heads rest on the I/O port when tightened...I don't know if I explain myself well?

This solution has worked well for me and IMHO is better than just repairing the holes area by glueing a small plastic part to the back cover.

kind regards

Ignacio