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Asked: 2021-11-18T15:03:40+00:00 In:

Olivetti PCS 286 Power Supply Problem

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Hi all.

I have an old Olivetti PCS 286 and when I plug it, then I turn it on and then, the fuse “explodes”.

How can I solve the problem?

(You have a lot of pictures here in my Dropbox: https://www.dropbox.com/sh/j5dmnory…

Thank you and bye.

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    1 Answer

    1. Hello all
      After reading a little bit and make some electronics recall I started reparing my Olivetti PCS 286 PSU. The good news it: It’s done !!!
      Mine PSU explodes the fuse: It’s problem was located in the bridge rectifier (it was short circuited), the power transistor was also short circuited and also replaced the PSU driver (FD1) and also the optocopler: that one with a number 3 above it. One advise NEVER replace the fuse with a higher one or you will melt the board tracks. Please note that the primary transistor is a BU508AF (equivalent one)

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