repair of HP65


I recently bought a HP65 in (I think) good condition. I replaced the battery pack with a brand new one, and turned it on. It started up and I played with it for maybe 10-15 minutes. Worked perfectly. Then did a small program, tested it, worked fine. Finally inserted a magnet card and tried to record data into that. Some mecanic trouble occured and a screaming sound (rubber wheel skidding?) Had to by force pull out the magcard.
And now after this episode the HP is half dead. When powering it on, the display looks okey (with a few stable zeroes in the correct positions), but if i press any key at all, all possible number are moving across the display "everywhere", some positions are having numbers counting up frenetically, and most positions just have flickering random numbers. Now if I turn off power, and on again, it again has the correct steady start up screen with a few zeroes in the correct position, and I can not press any button without it "explodes" again...
Apart from that my card reader needs maintanence/replace, how, if possible, can I get the calculator to work again? Or is it dead and gone?


Hello Richard.

Was the new battery pack fully charged before you started using the machine? Also, have you tried operation with the AC adapter connected (with the battery pack in place!!)? The card reader draws substantial current even when working and a bad one can draw even more. It sounds to me as if the attempted card read took the battery down to below minimum operating charge.

Best regards, Hal

Possibly Related Threads...
Thread Author Replies Views Last Post
  HP65 Prices - have I missed someting? Harald 9 2,458 05-17-2013, 06:54 PM
Last Post: ClausB
  Cheap rare HP35 and HP65 report Waon Shinyoe (China) 4 1,495 02-20-2013, 08:47 AM
Last Post: Frank Boehm (Germany)
  Restoring an HP65 (trying to .... few pics) Alberto Fenini 31 6,698 06-29-2012, 10:55 AM
Last Post: Peter HOFMANN
  HP67 motor in HP65 card reader - too slow Harald 4 1,615 05-21-2012, 06:52 PM
Last Post: Dave Shaffer (Arizona)
  HP65 program cards compatibility aurelio 2 1,014 05-04-2012, 04:43 AM
Last Post: aurelio
  Most worn out HP65 ever Harald 7 1,736 05-03-2012, 07:45 PM
Last Post: Harald
  HP65 related: I know it belongs in the adds, but I need advice. Luiz C. Vieira (Brazil) 2 915 04-07-2012, 07:31 AM
Last Post: Luiz C. Vieira (Brazil)
  HP65 vs HP67 card reader Alberto Fenini 2 964 04-17-2011, 05:09 PM
Last Post: Alberto Fenini
  HP65 in Nonpareil Harald 4 1,270 01-28-2011, 02:05 PM
Last Post: Harald
  HP65 (card reader) magnetic head Alberto Fenini 0 552 01-10-2011, 12:02 PM
Last Post: Alberto Fenini

Forum Jump: