HP 67 and 97 odd behavior- HELP
#1

Hello,

I have a problem with both my hp67 and hp97 both bought off auction sites. They both sometimes stop responding and when I press certain* buttons (not all have this problem) one of the numeric LEDs shuts off and turns back on when unpressed. The buttons always correspond to the same LED. Does this mean that both have fried circuits?

*On the hp67 only the last column (E, SST, h, CLX, 9, 6, 3, R/S)

*On the hp97 only the right set of buttons.

Help

-Fouad

#2

The keys on the 67 correspond to all the keys on the one column scan line. If the problem is intermittent you likely have a poor contact going to the keyboard on that line. Open up the calculator and clean the contacts to the keyboard.

On the 97, is the problem also intermittent and are all keys on the right half of the keyboard problematic?

Edited: 22 Nov 2011, 4:42 p.m.

#3

Hello Katie,

Yes all the keys on the right hand side of the hp97 have this issue.

I will clean the keys on the hp67 and tell you what happens.

Thanks,

-Fouad

#4

Don't clean the keys on the 67, just the contacts between the keyboard and the main board.

On the 97, the only thing that distinguishes the right half of the keyboard form the left half is the contact sheet sandwich. It must be that the right half sandwich is misaligned. You need to take the keyboard apart and check the alignment. This is actually pretty easy to do, no keys need to be remove just unscrew the keyboard PCB from the keyboard and you should see the problem immediately.

#5

Thanks Katie...

Cheers,

-Fouad



Possibly Related Threads…
Thread Author Replies Views Last Post
  request M.E. pac for HP-67/97 wallet cover scan Ignacio Sánchez 0 1,046 11-06-2013, 09:36 AM
Last Post: Ignacio Sánchez Reig
  HP PRIME : strange behavior when trying user key capability Damien 12 3,803 11-03-2013, 11:02 AM
Last Post: Joe Horn
  HP-67/97 Mechanical engineering PAC cover Ignacio Sánchez 0 999 10-30-2013, 04:35 AM
Last Post: Ignacio Sánchez Reig
  Prime formatting behavior Camille 0 843 09-28-2013, 05:37 PM
Last Post: Camille
  wp-34s (Inconsistent Behavior) Barry Mead 2 1,304 07-23-2013, 02:54 AM
Last Post: Marcus von Cube, Germany
  HP-41C Tall Keys Strange ON Behavior aj04062 3 1,656 12-02-2012, 06:49 AM
Last Post: aj04062
  Weird behavior from lithium AAs Dave Britten 4 1,558 11-14-2012, 06:22 PM
Last Post: Lars Bergström
  HP15C strange complex number behavior Mike W 5 1,952 09-11-2012, 04:36 PM
Last Post: Mike W
  Curious SINPLOT behavior on HP71B Christoph Giesselink 4 1,625 07-12-2012, 03:12 PM
Last Post: J-F Garnier
  HP-67/97 Mag Cards...Can they be marketed again? Matt Agajanian 11 3,449 05-14-2012, 10:22 PM
Last Post: Dale Reed

Forum Jump: