HP-71B Changing Lower and Upper Halves

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HP-71B Changing Lower and Upper Halves

03-23-2018, 10:20 PM (This post was last modified: 03-23-2018 10:31 PM by Dave Frederickson.)

Post: #8

Dave Frederickson Offline

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RE: HP-71B Changing Lower and Upper Halves

(03-23-2018 09:31 PM)MikeSD Wrote: Here are two different plastic back boards. Much different.

Actually, some of the via patterns look similar. Looks like the top board is multilayer with a ground plane and probably a VCC plane. Can we see a pic of the other side?

Thanks,
Dave

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Messages In This Thread

HP-71B Changing Lower and Upper Halves - MikeSD - 03-18-2018, 10:22 PM

RE: HP-71B Changing Lower and Upper Halves - Dave Frederickson - 03-19-2018, 01:43 AM

RE: HP-71B Changing Lower and Upper Halves - MikeSD - 03-19-2018, 03:28 AM

RE: HP-71B Changing Lower and Upper Halves - MikeSD - 03-19-2018, 12:58 PM

RE: HP-71B Changing Lower and Upper Halves - Paul Berger (Canada) - 03-19-2018, 01:53 PM

RE: HP-71B Changing Lower and Upper Halves - MikeSD - 03-19-2018, 07:24 PM

RE: HP-71B Changing Lower and Upper Halves - MikeSD - 03-23-2018, 09:31 PM

RE: HP-71B Changing Lower and Upper Halves - Dave Frederickson - 03-23-2018 10:20 PM

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