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HP Forum Archive 16

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Reset for the 41CV?
Message #1 Posted by christopher morgan on 3 Apr 2006, 7:11 p.m.

I started getting all the character/number elements on at once on the display where each display/number space is - rather than the outer four to make a "0", or the center horizontal one for a "-", or the center vertical and horizontal ones for a "+", I get something that looks like a "sunflower" (too many elements to make anything recognizable). I have left the batteries out for a while and it didn't help. Is there an "all reset" button or something I can use to give it a good, swift reboot? I wonder if the circuit board died just before it's 23rd birthday, and if repair is even possible to revive my dear companion. Thanks, Chris Morgan

      
Re: Reset for the 41CV?
Message #2 Posted by Thomas Okken on 3 Apr 2006, 7:39 p.m.,
in response to message #1 by christopher morgan

The reset sequence for the HP-41 series is: turn the machine off, then press and hold the left-arrow key, press and release ON, then finally release the left-arrow key. That should reset everything to its original state and show the MEMORY LOST message in the display.

- Thomas

      
Re: Reset for the 41CV?
Message #3 Posted by Karl Schneider on 3 Apr 2006, 9:06 p.m.,
in response to message #1 by christopher morgan

Christopher --

The "sunflower pattern" is undoubtedly "all 14 segments on" in a character position.

Thomas posted,

Quote:
The reset sequence for the HP-41 series is: turn the machine off, then press and hold the left-arrow key, press and release ON, then finally release the left-arrow key.

And if that doesn't work, you can read my recent thread, HP-41CX back to life using X-Function "PCLPS".

  1. Eliminate variable storage by executing "SIZE 000"
  2. Clear program memory by executing PCLPS from the X-Functions module (if you have one) with an empty Alpha register and the program pointed positioned at the beginning of program memory.
  3. Execute PACK.
  4. Reset as above.

-- KS

      
Re: Reset for the 41CV?
Message #4 Posted by Doug Wilder on 4 Apr 2006, 5:31 a.m.,
in response to message #1 by christopher morgan

There is also the "hot" reset while the calculator is on.

Press and hold the backarrow key, then quickly press and release the ON key. This procedure re-sets the program counter to 0000. Most usefull for crashed rom functions but worth a try.

Best

Edited: 4 Apr 2006, 5:32 a.m.

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