HP-41CV - doesn't power on

Everything about 41C 41CV and 41CX Hardware

Re: HP-41CV - doesn't power on

Postby cappy2112 » Wed Nov 29, 2017 12:57 am

Garth wrote:Your pictures have always shown up correctly for me. No problem here. I have firefox running under Ubuntu 14.04 Linux and the Gnome Flashback Compiz GUI.


I'm at work, it's posisble the IT dept has links outside the US blocked.
I'll try when I get home
cappy2112
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Re: HP-41CV - doesn't power on

Postby wgh52 » Wed Nov 29, 2017 3:16 pm

Hello HP41 fellows,

now it's the final stretch.

Final Assembly

Oh well, the screw dealer did not get into business with me because I thought of my other hobby: Listening to LP Records with magnetic cartridge pick-ups. I've found a matching mini-screw in my small fundus of cartridge fastening supplies which just does the trick to close the HP41CV case thoroughly even using the shortened/damaged post:

5 Screw length 2.PNG
5 Screw length 2
5 Screw length 2.PNG (57.27 KiB) Viewed 503 times


So with this I went to putting it back together:

7 Final Assembly 1.PNG
7 Final assembly 1


To get the rubber feet fastened I'm using fresh thin double sided glueing tape and with this I seem to be done. The thing works again, so let's see how this repair last for the longer term.

In retrospect, just a little clarifying side-note:
rprosperi wrote:... Acetone (your nail polish remover) can damage all plastics and even some board materials...
The cleanser I used was explicitly stated "acetone-free".

So, thanks for all the useful hints and information!
I hope this repair documentation will come in handy for some other HP-41CV users suffering sudden "outage" of this brilliant calculator!

Best Regards,
Winfried
wgh52
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Re: HP-41CV - doesn't power on

Postby JClovesHP » Mon Jun 03, 2019 2:43 am

Thanks to everyone for these posts.

My beloved 41C has been dead for a while, and today instead of doing other things I probably should have been doing, I Googled, found this thread, and tore into my dead 41C. Being I appreciate this community for its help, I wanted to give back and quickly post my "quick and dirty" solution to this problem.

Sure enough, after reading this thread, I realized my "lower right post" was broken. Now, I had no glue handy. And, I was not sure glue would hold anyway. But, I did notice the screw seems to secure. And, as noted in this thread I think, applying some pressure to the corner when assembled would bring my 41C back to life. So, I decided maybe just a little more pressure in that corner will just be enough to keep things connected and running.

So, I took two 3X5 cards, cut out a little squire with a notch to go around the post, and inserted it as shown in the picture I'm attaching. I picked two 3X5 cards for thee thickness factor. I pondered cutting up a plastic, "credit card like" gift card I had sitting on my desk, but felt that might be a little too thick. I also picked the 3X5 card as it, of course, will not conduct or cause problems with the circuit board.

After inserting and reassembling, my 41C is alive! It's alive!!!!!

I hope this helps someone in the future who's 41C sorrows are as sad as mine were.
Attachments
HP41_RepairWithPaper.JPEG
Picture of 3X5 Cut Out Inserted
JClovesHP
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Re: HP-41CV - doesn't power on

Postby wgh52 » Mon Jun 03, 2019 3:28 pm

Hello JC,

thanks a bunch for sharing your repair idea!

Regards,
Winfried
wgh52
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