HP-41 internal construction


Can anyone give me some pointers on how to determine what type of logic connector was used, perhaps based on serial number? I understand that early models used a connector material is difficult to reuse, and I don't want to pull apart a calculator that I can't re-assemble.



The problem connectors where typically on early CV's only. Rather than trying to identify by serial, it is much easier to identify by sight.

Remove the case bottom and look between the logic board and keyboard at the bottom edge. Problem connectors have flat edges and are pink in color. They are elastomeric material only. With the pink parts, the logic board will be firmly stuck to the keyboard and it will require a bit of force to pop it off.

Good parts are gold in color and use small wires rather than carbon to make the interconnects. Gold connectors may be one or two pieces, depending upon the age.

FWIW: If there are any white labels inside the calculator with coded numbers and a date, it was serviced by HP and the problem connectors would have been replaced with reusable parts.


Randy, exactly the information I needed. Thank you.


Possibly Related Threads…
Thread Author Replies Views Last Post
  HP-41(CL): The easiest way to transfer FOCAL programs from a Linux PC to the HP-41 Geir Isene 13 5,625 12-05-2013, 02:40 AM
Last Post: Hans Brueggemann
  Bug Bounty Programs Beat Internal Researchers Peter Murphy (Livermore) 0 906 07-12-2013, 06:59 PM
Last Post: Peter Murphy (Livermore)
  HP-67 internal function timings Dieter 3 1,414 02-10-2013, 05:18 PM
Last Post: Paul Dale
  HP-50G Internal help? Matt Agajanian 3 1,275 04-02-2012, 05:02 PM
Last Post: Matt Agajanian
  HP35s Internal Investigations - new processor? stefan 5 2,039 03-08-2012, 04:48 AM
Last Post: Paul Dale
  HP48S, different hardware construction Cristian Arezzini 5 1,824 01-12-2012, 04:29 PM
Last Post: Mike Morrow
  Talking about the WP 34s at the internal HP calculator forum Gene Wright 34 8,094 08-11-2011, 09:05 PM
Last Post: Paul Dale
  HP45 - internal pics Alberto Fenini 2 1,197 08-17-2010, 04:27 PM
Last Post: Alberto Fenini
  Pioneer series internal photo (17BII, 27S, 42S) Lyuka 4 1,833 11-16-2009, 06:26 PM
Last Post: geoff quickfall
  Improved Internal Accuracy in Newest Version of Free42 Les Wright 2 1,181 08-12-2009, 07:01 PM
Last Post: Les Wright

Forum Jump: