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+--- Thread: HP41-CV Troubleshooting (/thread-15379.html)
HP41-CV Troubleshooting - hoit - 07-26-2020 05:38 AM
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/hpmuseum/articles.cgi?read=149
What can I try next.
Many Thanks
RE: HP41-CV Troubleshooting - Diego Diaz - 07-29-2020 11:33 PM
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.
RE: HP41-CV Troubleshooting - hoit - 08-12-2020 03:27 AM
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
RE: HP41-CV Troubleshooting - Diego Diaz - 08-13-2020 06:46 AM
Hello Hoit,
Good to know you managed to find a working replacement.
Enjoy your 41 and keep safe! ;-)
Diego.