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HP-41C Sleeps Quickly
04-07-2016, 01:24 AM
Post: #1
HP-41C Sleeps Quickly
I just bought a 1983 fullnut HP41C with an eye toward a 41CL installation. The calculator powers up fine. I haven't done extensive testing but installing the byte grabber goes as expected. The calculator's ports are empty. There is no corrosion on the ports or on the battery contacts. I installed fresh batteries, and swapped those with know good batteries powering another calculator at one point.

The calculator sleeps about 12 seconds after becoming idle. I've never encountered behavior like this. Before I open the machine (as I must do to assess the 41CL install) can anyone shed any light on this behavior? The feet are well seated so I don't know if it has been opened before or not.

Howard
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04-07-2016, 05:12 AM
Post: #2
RE: HP-41C Sleeps Quickly
It may just be a poor connection issue. See:

http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=149916

http://www.hpmuseum.org/forum/thread-5564.html

http://www.hpmuseum.org/cgi-sys/cgiwrap/...311#113311
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04-07-2016, 05:37 AM
Post: #3
RE: HP-41C Sleeps Quickly
(04-07-2016 05:12 AM)Steve Simpkin Wrote:  It may just be a poor connection issue. See:

http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=149916

http://www.hpmuseum.org/forum/thread-5564.html

http://www.hpmuseum.org/cgi-sys/cgiwrap/...311#113311

Bingo! That's exactly what it is. Thanks for digging that out of the archives.

What search did you use, by the way?

Howard
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04-07-2016, 08:45 AM
Post: #4
RE: HP-41C Sleeps Quickly
(04-07-2016 05:37 AM)hbo Wrote:  Bingo! That's exactly what it is. Thanks for digging that out of the archives.
What search did you use, by the way?
Hward

I just used Google. The two search terms I used were:
HP 41 sleeps quickly site:www.hpmuseum.org
and
HP 41 turns off quickly site:www.hpmuseum.org
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04-07-2016, 10:20 AM (This post was last modified: 04-07-2016 10:21 AM by Howard Owen.)
Post: #5
RE: HP-41C Sleeps Quickly
(04-07-2016 08:45 AM)Steve Simpkin Wrote:  I just used Google. The two search terms I used were:
HP 41 sleeps quickly site:www.hpmuseum.org
and
HP 41 turns off quickly site:www.hpmuseum.org

If you listen closely, you may hear the sound of my palm slapping my forehead!

Thanks again. Smile


Regards,
Howard
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04-07-2016, 04:17 PM
Post: #6
RE: HP-41C Sleeps Quickly
LOLSmile No problem.
I also remembered reading about this symptom on this forum so I had a rough idea of what I was looking for.
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