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HP80: blank display, low Vcc
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HP80: blank display, low Vcc
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HP80: blank display, low Vcc
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10-23-2020, 02:19 AM
Post: #1
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HP80: blank display, low Vcc
I bought a non-functional HP80 off Ebay. Aside from some corrosion from battery leakage, it's in good physical shape. The display is totally blank on power-on. Using known good batteries, I did a quick test of voltages: Vss and Vgg are good, but Vcc is showing +3V (it should be +8.2V), which might explain the blank display. I don't have a scope yet, so I can't check waveforms, but I wonder if anyone has a suggestion as to what the problem might be.
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| Messages In This Thread |
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HP80: blank display, low Vcc - andrewsiegel - 10-23-2020 02:19 AM
RE: HP80: blank display, low Vcc - teenix - 10-23-2020, 03:52 AM
RE: HP80: blank display, low Vcc - andrewsiegel - 10-24-2020, 01:47 AM
RE: HP80: blank display, low Vcc - teenix - 10-24-2020, 09:36 PM
RE: HP80: blank display, low Vcc - andrewsiegel - 10-24-2020, 10:30 PM
RE: HP80: blank display, low Vcc - andrewsiegel - 10-24-2020, 10:35 PM
RE: HP80: blank display, low Vcc - teenix - 10-25-2020, 04:07 AM
RE: HP80: blank display, low Vcc - andrewsiegel - 10-25-2020, 04:51 PM
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