Re: HP65 Display Problem



#2

Hi John It sounds like your problem might be the anode or cathode driver chips or faulty circuit board connection. Rather than open my HP-65, I looked at page 5 of the HP journal issue (May 1974)which covers the HP-65 and has a picture of the driver chips. Since I have a photocopied version of this journal I can't be completely sure, but it looks like the part # for the anode driver is 1818-1029 and 1820-1226 for the cathode driver. I took out a 1820-1029 and 1820-1226 from a HP-35 recently, so I think the 65 used the same chips.I think the 1818-1029 and 1820-1029 are probably the same but don't hold me accountable!. I have noticed in the past that HP used different part numbers for chips with the same function. If you find you need to replace one or more of those chips, maybe I can help you.


#3

Thanks Erik, I'll ket you know how it goes. Cheers - John


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-41c display problem Ignacio Sánchez 6 423 09-04-2013, 10:52 AM
Last Post: Ignacio Sánchez Reig
  HP65 Prices - have I missed someting? Harald 9 653 05-17-2013, 06:54 PM
Last Post: ClausB
  Cheap rare HP35 and HP65 report Waon Shinyoe (China) 4 415 02-20-2013, 08:47 AM
Last Post: Frank Boehm (Germany)
  Can the display for a HP32Sii be replaced with the display from another model? Bruce Larrabee 8 574 10-10-2012, 10:05 PM
Last Post: Luiz C. Vieira (Brazil)
  Restoring an HP65 (trying to .... few pics) Alberto Fenini 31 1,677 06-29-2012, 10:55 AM
Last Post: Peter HOFMANN
  HP41 Display Problem Fouad M. Kaadou 3 303 06-29-2012, 07:46 AM
Last Post: Fouad M. Kaadou
  HP67 motor in HP65 card reader - too slow Harald 4 416 05-21-2012, 06:52 PM
Last Post: Dave Shaffer (Arizona)
  Sharp PC 1211 display change -- problem overnight -- suggestions? Gene Wright 12 690 05-16-2012, 03:31 AM
Last Post: Bart (UK)
  HP65 program cards compatibility aurelio 2 293 05-04-2012, 04:43 AM
Last Post: aurelio
  Most worn out HP65 ever Harald 7 457 05-03-2012, 07:45 PM
Last Post: Harald

Forum Jump: