Keyboard problem HP 41

[Peter]

Hi,

I got an HP 41CV which works fine, just one row (the + 5 6 7) row does not work. The keys click just fine, I dusted the whole thing inside out a few times, cleaned all internal contacts with alcohol.

Any ideas? Thanks so much in advance.

Peter

[Raymond Del Tondo]

Hi Peter,

if you have some spares, have you tried replacing

the CPU pcb and of course the zebra stripe ?

I had a similar case some time ago, where the rightmost

column of keys didn't work partially.

Replacing the zebra stripe alone didin't help,

but replacing the CPU pcb was the solution.

It's not necessarily the solution for your case,

but it's an option to try;-)

Another possibility is corrosion and/or a broken

lane on the keyboard pcb.

Regards,

Raymond