HP-35 Power Supply Waveforms
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04-08-2019, 05:52 AM
Post: #24
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RE: HP-35 Power Supply Waveforms
Hi
this is the guide we are using : http://home.comcen.com.au/therobinsons/h...repair.pdf if you look at page 7, after disconnecting the measurement points the values should be : Vcc should be just around 8.2V. Vgg should be about –12.4V Vss should be about 6.28V which are the same we encounter on a working HP65 our are a little higher, which to me is difficult to explain considering the similarity of all of the components used The idea was to have a working PSU and use it for both testing unknown components from broken units, or to power units (classic only) under troubleshooting whose PSU condition is uncertain ... but with these values we are afraid to use ... Thanks for all the support and take care ! Edoardo & Alberto |
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