RE: Tempest help please!

You check for AC ripple on a DC line by:

 - Switch the meter to check for AC
 - Connect the leads to the DC +/- lines

If there is ripple, you will then see this as an AC voltage. Anything over
0.05 should be considered abnormal and the applicable filter caps and
possibly rectifier(s) should be replaced.

> -----Original Message-----
> From: owner-vectorlist@vectorlist.org
> [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Roger Smith
> Sent: Thursday, October 9, 2003 3:52 AM
> To: vectorlist@vectorlist.org
> Subject: Re: VECTOR: Tempest help please!
>
>
> How do I check for "ripple" with a digital multimeter? Thanks.
>
> Rog
>
>
> >From: "mccullar" <mccullar@flash.net>
> >Reply-To: vectorlist@vectorlist.org
> >To: <vectorlist@vectorlist.org>
> >Subject: Re: VECTOR: Tempest help please!
> >Date: Wed, 8 Oct 2003 19:01:38 -0500
> >
> > > 2.) While checking for power problems, I noticed that there is an
> >immediate
> > > voltage drop from the +5 edge connector pins to their respective
> >contacts
> >on
> > > the board edges, which measure 4.89. Should I adjust the
> +5 pot on the
> >AR
> > > board to compensate?
> >
> >I wouldn't touch that pot yet. It sounds like you may have
> "heat rot" on
> >the edge connector pins. With the power off, remove the
> cable harness and
> >see how corroded the finger contacts are on the CPU board
> and auxiliary
> >board. If they're corroded or dull, you can clean them up
> nice and shiny
> >with an ordinary pencil eraser.
> >
> >That may not be the end of your problem, though. Make sure
> your +5 volts
> >is
> >nice and clean, with no ripple. Also check the interconnect cable
> >connectors between the CPU board and Aux board for bad
> solder joints. That
> >happens a lot.
> >
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Received on Thu Oct 9 10:54:46 2003