RE: Tempest help please!

Unless I have been misinformed about "ripple" (Somebody please tell me if I
am wrong), it is just AC voltage (picture a sine wave) flowing down the same
wire as a DC voltage. So all you have to do is change your digital
multimeter to measure AC voltage and stick it on the +5 line. If you see
any AC voltage, you have ripple. When I measured my Asteroids, I got
readings in the .005 to .010 of a volt range. I don't know what the
acceptable range is, but that is pretty low. Knowing how sensitive games
can be to the +5, I'd say anything over .1 would be cause to start checking
the AR. I've never had to do more than replace a couple burnt up diodes on
them, but they don't have that many parts and the schematic reads very
straight forward.

Sean McLachlan
MIS Manager
LithoFlexo grafics inc.
801.484.8503

-----Original Message-----
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org]On Behalf Of Roger Smith
Sent: Thursday, October 09, 2003 4:52 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 11:12:22 2003