Need information on repairing 41CX keyboard


Anyone out there have any tips on what to try out when the PRGM rocker on a 41CX doesn't work? The ALPHA function is there after some jiggling with the rocker. I also have problem with the fraction mark "." button. The click is there but it need to be pressed for a little longer time than normal, so if I'm calculating I have to wait up and see if there is a fraction mark in the display.

Any help on this matter is appreciated.


Try to open the calculator. 4 screws under the rubber feet.

Then clean up the upper contacts (below the power/port module chip) and the lower cotacts. Re-position then correctly.

Check if both parts of the calculator are well sticked together when you remount it.

It should work.... Otherwise it's a problelm with the rocker contact, which is much more complicated to repair !


Thanks Thibaut, I already tried that. Seems to be the rocker switch that is the problem.


Sometimes a squirt of circuit board cleaner helps, I have used Electrolube Ultrasolve, you squirt it through the tiny hole in the back of the circuit board, the "exercise" the switch. When doing this, it is possible the switch will get worse before it gets better.

Possibly Related Threads...
Thread Author Replies Views Last Post
  Need service information for HP 82161A Cassette Drive Peter N1 2 1,050 07-14-2013, 04:11 AM
Last Post: Tony Duell
  Repairing HP 65 Michae Altmann 5 1,579 03-15-2013, 04:13 AM
Last Post: Joel Setton (France)
  [41CL] Repairing an image in Flash Monte Dalrymple 0 677 01-24-2013, 07:01 PM
Last Post: Monte Dalrymple
  Book on repairing HP calculators? Dave F 24 4,252 11-23-2012, 06:46 AM
Last Post: Bart (UK)
  Information that may be of interest to HP-75 users posted Paul Berger (Canada) 1 1,091 02-04-2012, 08:03 PM
Last Post: Geir Isene
  HP-25C Repairing aj04062 11 2,421 10-31-2011, 01:11 PM
Last Post: Randy
  Repairing HP 41C screw posts Fouad M. Kaadou 7 1,809 09-25-2011, 08:19 PM
Last Post: Randy
  Correct 15C information Tim Wessman 35 5,933 09-06-2011, 08:54 PM
Last Post: Dan W
  The week of repairing calculators David Ramsey 6 1,564 08-25-2011, 12:15 PM
Last Post: David Ramsey
  Some minimal information about roms in the upcoming 41CL library... Gene Wright 6 1,686 05-25-2011, 06:13 PM
Last Post: Monte Dalrymple

Forum Jump: