HP Forum Archive 15

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Mix and match parts between HP-41CV and HP-41CX Message #1 Posted by Andreas Terzis on 13 Mar 2006, 3:31 a.m. I have an HP-41CV in very good condition. Can I borrow parts from that and replace the ones on the CX with corrosion and possible corrosion of other parts? Both work currently. Should I not bother and wait until the CX fails?

Re: Mix and match parts between HP-41CV and HP-41CX Message #2 Posted by Tony Duell on 14 Mar 2006, 2:02 p.m., in response to message #1 by Andreas Terzis This depends on whether the machines are Fullnut or Halfnut. If one is a fullnut and the other a halfnut, then AFAIK the only common parts are the battery holder and I/O assembly (the flexible PCB on the plastic frame that connects to the battery pack, modules, etc). If both are fullnuts, then the CPU board is different between a CX and CV. Some of the chips might well be the same, though. The keyboard PCB, display module, all case parts (apart from labels!), I/O assembly, CPU board connector, etc are the same. If both are halfnuts, then you have less you can interchange. The ROM is different, and that's part of the display hybrid on a halfnut. So unless you want to start dismantling the heat-staked keyboard, the only things you can swap are the back case and I/O assembly. There's a bridge board in the CX only which contains the extended functions ROM, timer ROM, timer chip, extended memory, etc, but if you fit this to a CV all you get is the timer functions. The CV ROM will not detect the extended functions ROM.

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