HP41CV



#2

does anyone know how to fix the display turning off within 2 seconds of my last entry. i have check the function that sets the calculator to turn off after no use, but that seems to be okay. the batteries are new also.

any suggestions?


#3

As long as I know the HP41 turns off after ten minutes of inactivity, not just two seconds. Have you set the flag 44 with the ON function (XEQ "ON", not the [ON} key) ?


#4

There is a fault that produces this behaviour.

I'm sorry but I don't recall what it is. As I understand it (and I may be wrong) but the timer for the 10 minute power off is located on the display board.

Maybe you have a fault on this?

The problem may be a bad connection in the calculator somewhere. If you're feeling brave you could open it up and try to find and fix it.

The points of weakness seem to be the connections between the upper and lower board, and the connections to the display board.

Best of luck


#5

This is just to confirm that the automatic off function is controlled by the display, so it is a possible suspect.

Keep in mind that the HP 41 has three operating states:

- sleep (off but keeping memory contents),

- standby (display is showing the last result),

- running (a peripheral is operating, a program is running or a key function is being pressed or calculating)

When in standby state, the display is the "only" working part of the calculator. ("only" is a relative word in this context...)

Other (less probable) suspects are the power supply chip and the internal connections between boards.


Possibly Related Threads...
Thread Author Replies Views Last Post
  hp41cv memory modules tim peterson 10 713 11-07-2013, 11:09 PM
Last Post: Garth Wilson
  HP41CV Mike Powell 12 750 10-30-2013, 08:17 AM
Last Post: Mike Powell
  HP41CV Bry Sun 11 732 10-22-2013, 12:52 PM
Last Post: Geoff Quickfall
  HP41cv expiriences of a new user Wolfgang 28 1,280 02-13-2013, 08:02 PM
Last Post: Mike Morrow
  A simple question about the HP41C or HP41CV Antoine M. Couëtte 6 440 12-16-2012, 04:06 AM
Last Post: Antoine M. Couëtte
  Problem with HP41CV Bruce Larrabee 19 1,036 09-18-2012, 09:29 AM
Last Post: Luiz C. Vieira (Brazil)
  HP41CV drains battery. Schematics? Harald 15 813 03-18-2012, 09:22 PM
Last Post: Luiz C. Vieira (Brazil)
  HP41CV batteries John Abbott (S. Africa) 3 308 03-02-2012, 06:15 AM
Last Post: John Abbott (S. Africa)
  HP41CV faulty Steve Hunt 6 380 12-27-2011, 12:45 AM
Last Post: Kerem Kapkin (Silicon Valley, CA)
  Repair HP41CV. Help needed. Kees van der Sanden 4 310 10-11-2011, 07:44 AM
Last Post: Ronald P

Forum Jump: