Problem - HP-97



#2

I ask for help.
In a HP97 with the battery totally full and tested in other 97 when I activate only appears the led indicating that I need to recharge the battery
I thank any help

#3

Hi Gileno,

Have you tried running it on the AC adapter? (with the battery pack in of course). Also, try scrubbing the calculator's battery contacts real good with an eraser, then some alcohol on a cotton swab.

Best regards, Hal


#4

Have you tried running it on the AC adapter?

Yes :-(

Battery contacts

Good :-(

Thank's :-)


#5

What electronic test equipment do you have, and what experience do you have with electronic repair?

The HP97 service manual is on the CD-ROM set. It contains full schematics of the machine.

I'd start by checking the voltages on the Vss (+6.2V) and Vgg (-12V) lines. If the power converter circuit in a Topcat isn't running, the protection circuit tries to bring the battery voltage right down and gets hot-and-bothered in the process!.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP 67, 97, 97+ emulator Olivier De Smet 8 667 11-11-2011, 09:57 AM
Last Post: Israel Otero
  Odd sign problem with HP-97 Dan W 0 187 07-15-2009, 09:05 PM
Last Post: Dan W
  HP-97 Card Reader NOT gummy wheel problem ZOleg 3 345 02-03-2009, 07:12 PM
Last Post: ZOleg
  Problem with HP-97 Card reader jbssm 1 232 05-20-2008, 03:21 PM
Last Post: plasmoid
  HP-97 Keyboard Problem Nick Taylor 1 250 12-04-2007, 09:24 PM
Last Post: Randy
  Odd sign problem with HP-97 Dan W 0 152 07-20-2007, 04:44 PM
Last Post: Dan W
  HP-97 printing problem Juergen (CH) 10 597 05-24-2003, 08:00 PM
Last Post: David Smith
  HP-97 printer problem George Merriman 1 230 03-28-2003, 05:59 PM
Last Post: David Smith
  HP 67/97 "Trick" Cards Warning for HP-97 Users Dan M (Vermont, USA) 0 178 09-12-2002, 08:31 AM
Last Post: Dan M (Vermont, USA)
  HP-97 Power/Charging Problem sok 2 247 07-09-2002, 01:26 AM
Last Post: sok

Forum Jump: