Need IBM Portable 5155 power supply

From: Russ Blakeman <rhblake_at_bigfoot.com>
Date: Mon Apr 23 15:44:21 2001

Exactly right. I use an old 360k drive attached to one of the Molex
connectors to get the old ones to kick in - threw away 3 old supplies before
I knew that, long time ago.

> -----Original Message-----
> From: owner-classiccmp_at_classiccmp.org
> [mailto:owner-classiccmp_at_classiccmp.org]On Behalf Of Tony Duell
> Sent: Monday, April 23, 2001 2:38 PM
> To: classiccmp_at_classiccmp.org
> Subject: Re: Need IBM Portable 5155 power supply
>
>
> >
> > Hi,
> >
> > The PS in my IBM Portable seems to be dead.
>
> How are you testing it? Most IBM PC PSUs of that period need a load
> before they will start up. The PSU on its own will appear to give
> no outputs.
>
>
> >
> > I would appreciate it if someone could send me a new
> > PS!
>
> Would you be interested in having a go at repairing the existing PSU.
> From what I remember it's a fairly conventional SMPSU, similar to the one
> in the PC/XT machine. You'll need bristol spline keys and tamperproof
> torx drivers to get inside, though, and at least a multimeter for
> troubleshooting (a 'scope and isolating transformer are useful!). You'll
> need the bristol spline keys to get the whole PSU unit out of the
> 5155, BTW.
>
> If you do decide to go inside, remeber there are dangerous voltages in
> there. Much of the circuitry is not isolated from the power line. And
> there are capacitors that charge up to a total of 400V (and when the unit
> is operational, that circuit can easily supply enough current to kill
> you!). Take great care if you do pull the cover.
>
> -tony
Received on Mon Apr 23 2001 - 15:44:21 BST