HP 85 calculator repair help

[Gianni]

My HP85 had some disaster and now I am trying to fix the power supply board.

Currently, the problem is that Vcc = 6.5V instead of 5V. Maybe that it caused other catastrophes but to understand I must first fix the power supply.

MY PROBLEM is that my PSU board is DIFFERENT from the manual. Has somebody the schematic diagram of this board? I would be very grateful.

Thanks

[cruff]

There are lots of HP series 80 enthusiasts on the hpseries80@groups.io list who can be of help. It would help to know which specific model (A or B) of the HP85 you have. The HP Computer Museum http://www.hpmuseum.net/collection_document.php has many manuals for HP products including the series 80 systems if you haven't yet found them.

[Gianni]

thanks, I will follow your suggestion

[Gianni]

Just to leave a record for other interested. My is a "B" model, so I had to use the right manual. This power supply requires a minimum load on the +5V (300mA) to work. So no disaster, everything was OK and my HP-85B is up and running (besides the cassette that I am fixing).