Can anyone tell me whether I can get my faithful HP41C serviced?
The electronics are OK but it needs work done to the case internally. The small posts into which the screws holding the case together are embedded have cracked. This causes a bad connection between the main body and the LCD causing spurious readouts.
My heart does not allow me to bin this lifetime aid!
Thanks in advance for any advice!
Roger Hubbert


I have used Duco Cement, like the old airplane glue, with pretty good success on that plastic. It might depend on how many pieces your posts that the screws go into are broken into.

There are discussions here in the archives on procedures for performing this repair.

In general, the HP-41C series are pretty rugged and repairable. Good luck.


When you glue them, wrap a piece of thin wire around the post. Thin so it won't get in the way. Get some glue over it. This will prevent future splitting.

There seems to be enough clearance on the ones at the display end. The others are a bit more problem if you have a CPU board there, as it is fairly tight fit on the board.


DO NOT use a glue to fix the posts. It WILL eventually fail again.

My recomendation is to use a plastic welding solvent sold at most hobby shops. It works by melting the plastic and letting it fuse back together, just like a metal weld. The ones I use contain the solvent methylene chloride (dichloro-methane).

Use a small brush to work the solvent into the cracked post (wet it pretty good) and then clamp it (or wrap with THIN wire, if you must). Let it set for at least 24 hours (dont believe the bottle instructions that say use sparingly and sets in 10 minutes).

Possibly Related Threads...
Thread Author Replies Views Last Post
  How to check / repair a HP 82106A module for HP41C calculator ? Eduardo Mingo 13 2,043 01-07-2013, 11:05 AM
Last Post: Diego Diaz
  A simple question about the HP41C or HP41CV Antoine M. Couëtte 6 1,381 12-16-2012, 04:06 AM
Last Post: Antoine M. Couëtte
  HP41C repair ? Michael Paul 4 1,026 09-30-2012, 11:26 AM
Last Post: db (martinez, ca.)
  A cheap HP41C for sale...........999 EURO only aurelio 4 1,090 06-04-2012, 03:46 PM
Last Post: jerome ibanes
  HP41C: Factorial (kind of) in MCODE Frido Bohn 7 1,467 05-26-2012, 09:18 AM
Last Post: Frido Bohn
  Picture of HP41C from "The Dream is Alive" Christopher Johnson 0 536 04-20-2012, 02:38 PM
Last Post: Christopher Johnson
  HP41C "Power Module" Frido Bohn 10 1,663 01-03-2012, 03:35 PM
Last Post: Geir Isene
  HP Time Module+Overlay! 82182A for HP41c robertoataulfo 1 612 01-01-2012, 12:33 PM
Last Post: Howard Owen
  HP41c+ : i still prefer it Michel Beaulieu 40 5,134 10-19-2011, 03:11 AM
Last Post: geoff quickfall
  Anyone know anything about this HP41C RAM / EPROM ROM SIMULATOR? Bruce Larrabee 11 1,899 09-30-2011, 02:25 PM
Last Post: Ángel Martin

Forum Jump: