doscoloration of HP-71B's metal cover



#3

Recently, I've got an HP-71B whose metal cover surrounding the display shows a brownish discoloration. The former owner of the machine says that this is probably due operation of the unit in a metallic protective case. I tried to get rid of this grime using both a household detergent and 94% isopropyl alcohol. Unfortunately, the results were poor and unsatisfactory! Does anyone know how to get rid of this brownish grime? Any advice would be appreciated! Thanks for your time!

Regards, Juergen


#4

Try white gas (Coleman camping fuel). It sometimes works wonders (particularly for adhesive residues). It does not harm the plastic cases but can leave "water" marks on the keyboard background. Make sure your solvents are compatible by testing in on the back of the battery cover first.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-41 module covers and side port cover Nate Martin 1 356 12-02-2013, 01:51 AM
Last Post: Giancarlo
  HP67/97 M.E. Pac cover Ignacio Sánchez 2 375 11-22-2013, 04:04 AM
Last Post: Ignacio Sánchez Reig
  request M.E. pac for HP-67/97 wallet cover scan Ignacio Sánchez 0 279 11-06-2013, 09:36 AM
Last Post: Ignacio Sánchez Reig
  HP-67/97 Mechanical engineering PAC cover Ignacio Sánchez 0 259 10-30-2013, 04:35 AM
Last Post: Ignacio Sánchez Reig
  HP 50G battery cover replacement wildpig 1 235 08-03-2012, 11:53 AM
Last Post: Tim Wessman
  HP-28S Battery Cover Kerem Kapkin (Silicon Valley, CA) 2 439 04-09-2012, 10:29 PM
Last Post: aj04062
  HP classic calculator battery cover tabs Fouad M. Kaadou 0 185 11-07-2011, 04:54 AM
Last Post: Fouad M. Kaadou
  HP-01 Back Cover Tool aj04062 8 604 04-05-2011, 02:13 AM
Last Post: Geoff Quickfall
  HP 25 Battery Cover Stuck? M. Pollock (Canada) 7 510 04-03-2011, 08:40 AM
Last Post: M. Pollock (Canada)
  HP-IL 71B to 71B via HPIL Geoff Quickfall 11 838 12-01-2010, 06:55 PM
Last Post: Michael Meyer

Forum Jump: