Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!ig!ames!think!husc6!psuvax1!psuvm!kdm101
From: KDM101@PSUVM.BITNET (Kevin Maher)
Newsgroups: comp.sys.ibm.pc
Subject: Re: PS/2 Model 50 Problems
Message-ID: <89198.132659KDM101@PSUVM>
Date: 17 Jul 89 17:26:59 GMT
References: <111700119@uxa.cso.uiuc.edu>
Organization: Penn State University - Center for Academic Computing
Lines: 26

According to my PS/2 family repair guide, it sounds as if you have a power
supply failure. The IBM tech just dropped by too, and agreed, but said this:
Try to reseat the power supply.  You will have to remove 3 screws to do this.
If that fails, chances are rather good that it is the PS unit and it will have
to be replaced.  If you really want to check it, take it out completely, and
check the various pins for proper voltage if possible.  Here are the correct
voltages for the power connector.


             1 3 5         15
             | | | | | | | | | | | | | | | | | | | | | | | | |
             | | | | | | | | | | | | | | | | | | | | | | | | |
             2


                     V Dc
                    Minimum      Maximum       Ground pin      Pin
                     -9.0         -15.0            2            1
                     +9.0         +15.0            2            3
                     +3.7          +6.2            2            15
If any of these voltages are incorrect, replace the power supply.  There could
be a few other problems, but like I mentioned before, this should be the
problem.

Let me know if you still have other problems. (By Email to
KDM101@PSUVM.PSU.EDU / PSUVM.BITNET)