HP41CX weird behavior



#2

I found a 41CX at a thrift store for the princely sum of $2. It seems to work for basic operations, however, it has weird problems with certain functions. For example, if I try “CAT 1” it doesn’t allow me to enter the number portion of the command. Trying “RCL 01”, it allows me to enter the “0”, but the “1” changes the command to a “ST+”. I took the batteries out for several months, and when I put them in again the screen displayed “EMORY LOST G”. In PRGM mode, there appears to be something still in the program memory, because when I try “GTO . .” it assumes it is program step 08. Hitting “BST” just locks the whole calculator up.

Any suggestions on how to fix this calculator?


#3

Internal contacts probably need to be cleaned.

#4

I would recommend first resetting the machine by holding down the gold shift key and the pressing and releasing the "ON" switch. You should see "MEMORY LOST".

If problems persist you will need to clean the internal contacts between the keyboard and the battery assembly and CPU cards.

#5

Thanks to those who responded. I cleaned all the internal contacts with DeOxit and the calculator works much better.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP PRIME : strange behavior when trying user key capability Damien 12 1,021 11-03-2013, 11:02 AM
Last Post: Joe Horn
  Prime formatting behavior Camille 0 193 09-28-2013, 05:37 PM
Last Post: Camille
  HP41CX: Strange serial #... Stephan Matthys 1 276 09-13-2013, 01:38 PM
Last Post: Stephan Matthys
  hp50g screen weird line Sok-khieng Chum Hun 2 363 09-10-2013, 08:11 AM
Last Post: Sok-khieng Chum Hun
  wp-34s (Inconsistent Behavior) Barry Mead 2 309 07-23-2013, 02:54 AM
Last Post: Marcus von Cube, Germany
  weird statistics bug in wp34s Andrew Nikitin 5 565 06-20-2013, 01:54 PM
Last Post: Namir
  HP-41C Tall Keys Strange ON Behavior aj04062 3 414 12-02-2012, 06:49 AM
Last Post: aj04062
  Weird behavior from lithium AAs Dave Britten 4 362 11-14-2012, 06:22 PM
Last Post: Lars Bergström
  HP15C strange complex number behavior Mike W 5 531 09-11-2012, 04:36 PM
Last Post: Mike W
  Curious SINPLOT behavior on HP71B Christoph Giesselink 4 434 07-12-2012, 03:12 PM
Last Post: J-F Garnier

Forum Jump: