HP 41CX NULL MESSAGE



#3

This is my first time on this message board so please take pity !

For the first time ever I have a "NULL" Message on my 41CX.

I cannot figure out how to get rid of it and get back to normal functions.

I have pushed all the buttons (and wiggled them too) but obviously not the correct one(s) or sequence(s).

I've tried to turn it off with the ON button but this does not work at all to shut it off.

Removing the battery clears the screen but on replacing the battery, the screen NULL message comes right back.

There is a program set by cards on the CX that can be re-loaded.

Any hints would be most greatfully received.

Thank you

Derek


#4

Derek --

"NULL" is the message displayed when a command is cancelled by holding its (last or only) key down for a few seconds. The message should disappear when the key is released.

Possibly, a persistent electrical contact is being made on one or more of the keys on your HP-41CX, due to mechanical failure or contamination.

One thing you could try is a master clear: Turn the calc on while holding down the backarrow (CLEAR) key.

If that doesn't help, I'd recommend inspection and repair by
www.fixthatcalc.com. The site owner has repaired several of my own fullnut (pre-1985) HP-41's.

-- KS

Edited: 1 Jan 2008, 4:36 p.m.


Possibly Related Threads...
Thread Author Replies Views Last Post
  Formatting the app view message with bullets (dots) Geoff Quickfall 4 745 10-14-2013, 06:22 PM
Last Post: Geoff Quickfall
  message for Andreas Grund Don Shepherd 0 355 09-26-2013, 03:56 AM
Last Post: Don Shepherd
  Message to Eric Rechlin Etienne Victoria 3 659 09-24-2013, 07:50 PM
Last Post: john mantooth
  Message to Luiz C. Viera Peter A. Gebhardt 2 483 02-27-2013, 09:27 AM
Last Post: Peter A. Gebhardt
  Error Message/Procedure HP-48SX with TDS Survey SX card bporter101 6 919 12-10-2012, 10:18 AM
Last Post: bporter101
  WP34s Stopwatch & statistics, message for Matthew Krotzer pascal_meheut 2 538 05-23-2012, 03:30 PM
Last Post: pascal_meheut
  Message to Katie Wasserman: thanks! Ignazio Cara (Italy) 2 532 12-20-2011, 05:04 AM
Last Post: Ignazio Cara (Italy)
  Message concerning shipment from Samson Cables kc 6 798 09-15-2011, 12:15 PM
Last Post: Neil Gruending
  Message to Diego Diaz about HP 41 flex PCB Alexander Oestert 0 350 08-02-2011, 08:57 AM
Last Post: Alexander Oestert
  HP-67 Error message aj04062 3 562 05-15-2011, 01:32 PM
Last Post: Randy

Forum Jump: