HP-25C needs chips to come back to life


Hello all,

my HP-25 I was given recently powers up and shows "0.00" on display, but unfortunately the keyboard remains non responsive.
Sounds like the keyboard controller is dead.
One or probably three chips are fried.

If anyone of you has some spare chips he could give/sell me, please contact me, I will give him the exact part numbers of the chips and the way to proceed.

Before you tell me: I have already asked Randy (FixThatCalc). Unfortunately he does not have the parts.

Kind regards.



e-mail me. Chances are I may have one/some of these.

linux underline lcv (at) yahoo (dot) com.br


Luiz (Brazil)

Edited: 10 June 2010, 9:14 p.m.



did you read this post? That's the main reason I may have the chips you need. In fact, I have already tested two of the ACT units and they are not OK. I use an HP25 PCB with IC´s sockets so I can easily test any of them. Even the two IC's under the LED display are readily changeable.


Luiz (Brazil)

Possibly Related Threads...
Thread Author Replies Views Last Post
  HP Prime: Converting number to Sci notation and back BruceTTT 1 379 11-12-2013, 02:11 AM
Last Post: Phil Wipf
  HP-25/25C Potential Matt Agajanian 14 1,397 07-17-2013, 02:57 AM
Last Post: Matt Agajanian
  Later HP-25C Keyboard Repair aj04062 2 411 04-23-2013, 07:25 PM
Last Post: aj04062
  For sale: HP 25C and Stat Pac 2 for HP 65 Michae Altmann 1 390 04-21-2013, 01:24 PM
Last Post: Raymond Del Tondo
  Getting back to the CL Geir Isene 6 661 03-20-2013, 07:02 PM
Last Post: Geir Isene
  Repaired HP-97 card reader doesn't show any signs of life jbssm 6 809 02-17-2013, 03:15 AM
Last Post: Alberto Fenini
  shelf life time of a ROM, EEPROM, EPROM vs Mask Rom Guido (Canada) 6 792 01-11-2013, 04:09 PM
Last Post: Thomas Falk
  dm-15cc battery life David Griffith 7 750 12-04-2012, 10:07 PM
Last Post: Walter B
  battery life and the 50G Al 4 541 11-23-2012, 06:23 PM
Last Post: Chris Randle (UK)
  Battery life John Mosand 2 372 11-11-2012, 10:55 AM
Last Post: Eddie W. Shore

Forum Jump: