HP-67 Display: Big Trouble -> HELP!



#3

Hi

I've a big trouble with my HP-67 display: two days ago it began to light on several segments as a "shadow". I mean, for instance: 0.00 is shown as 8.88, but not on all segments with the same brightness. It happens on the 'almost' every 15 digits (sign digits shows "-" dull).

The machine works fine (programming, calculating and storing run OK).

Would anyone bring me the two ICs display drivers pin out? May be the three current drivers were out at the same time? Is a bastard drain resistor guilty, or a dead capacitor? Perhaps the problem is there ... I don't know, really. What can I do?

Thanks in advance,

Albert


#4

The middle segment of the HP67 display is a very weird thing. It is driven differently than the other segments because of the way the sign and exponent sign are decoded. Most of those discrete transistors on the keyboard circuit board are for doing that segment.


Possibly Related Threads...
Thread Author Replies Views Last Post
  OT--Found!!! An HP reference on 'The Big Bang Theory' Matt Agajanian 0 580 11-08-2013, 10:23 PM
Last Post: Matt Agajanian
  OT--'The Big Bang Theory' and RPN/HP--Any connections? Matt Agajanian 19 2,485 09-05-2013, 08:27 AM
Last Post: Adrien Bertrand
  trouble flashing wp34s under Linux Glenn Becker 8 1,313 07-23-2013, 02:21 AM
Last Post: Marcus von Cube, Germany
  TVM WP34s trouble Jim P 4 926 06-28-2013, 07:31 AM
Last Post: fhub
  Trouble dumping Pioneer ROM via IR Neil Hamilton (Ottawa) 6 1,240 06-20-2013, 08:14 AM
Last Post: Neil Hamilton (Ottawa)
  41CL :TROUBLE IN FILE TRANsFER aurelio 22 3,021 06-18-2013, 03:44 PM
Last Post: aurelio
  Trouble entering a HP35s program line Arno 2 771 04-05-2013, 06:28 PM
Last Post: Arno
  wp34s reflashing trouble... Calckidd (USA) 3 660 03-04-2013, 04:32 PM
Last Post: CalcKidd (USA)
  [41CL] Trouble compiling CLWriter.cs Dan Grelinger 3 791 02-17-2013, 10:52 PM
Last Post: Dan Grelinger
  Trouble with RS-232/HP-IL Interface (HP 82164A) Hans Holzach 9 1,537 01-08-2013, 01:52 AM
Last Post: Marcus von Cube, Germany

Forum Jump: