HP41-CV Troubleshooting

[hoit]

When putting in new batteries / turning on my HP-41CV I'm either getting

1) a high pitched squeal
2) a set of characters on the screen

https://imgur.com/V363v29

I have tried a hard reset without success. The batteries are new and the battery terminals are in good condition without corrosion.

I have also tried the options here
https://www.hpmuseum.org/cgi-sys/cgiwrap...i?read=149

What can I try next.

Many Thanks

[Diego Diaz]

Hi,

Hard to tell without some pictures (from different angles) of your CV. Most common cause of failure on the 41 series (mainly on full-nut type) is the broken screw post syndrome.

You may want to open your calc and check if the screw posts are not damaged/broken.

Share some pictures if you're not sure about what to look for.

Regards.

Diego.

[hoit]

Hi Diego,

many thanks for the response. I guess people would get tired of answering the same noob questions. It would really help if there was a "sticky thread" that had basic troubleshooting tips.

In the end I cracked open the calculator and found the processor had some corrosion on it. I cleaned it as carefully as I could with isopropyl but could see some of the tracks looked to be in poor condition.

I sourced a replacement processor from a helpful seller on eBay which has fixed my problem.

Cheers
Hoit

[Diego Diaz]

Hello Hoit,

Good to know you managed to find a working replacement.

Enjoy your 41 and keep safe! ;-)

Diego.