HP-65 goes on hold after reading a card
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11-18-2020, 03:00 AM
(This post was last modified: 11-18-2020 03:01 AM by teenix.)
Post: #24
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RE: HP-65 goes on hold after reading a card
The original hybrid obviously has a problem with the display.
The original keyboard also seems to have a problem causing display issues. Maybe while operating together, they are causing too many issues for the CRC to operate properly. Are the power supply voltages ok when both faulty boards are used together, no increase in supply noise? Do any ICs or hybrid get warm to the touch after being operated for awhile. Is the wiring between the boards frayed at the connection and maybe should be re-soldered? If you are using a mains power supply to power the calculator, sometimes connecting a mains operated oscilloscope causes earth loops and upsets the operation. cheers Tony (11-17-2020 10:15 PM)albertofenini Wrote: Hi Tony |
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