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I'm not sure why. I was looking for any physical damage and I gave
them each a slight tug to see if any of them wiggled and two of them
snapped off like twigs. The rest were fine. I'm pretty sure this
board was worked on before.
Matt
On Mon, 03 Dec 2007 09:11:53 -0600, Pat Danis wrote: Why did the
pots break off? From rough handling/storage or from breaking the glue
and trying to adjust them?
Pat D.
Matt Rossiter wrote:
Ok,I almost have it fixed. I think what happened is either a bad
15v voltageregular really wreaked havoc on the AVG and took out a
bunch of parts orsomeone may have put in a wrong part (maybe a -15v
regulator by accident). That's the only theory I can come up with for
so many bad IC's. I didn'tsee any physical damage though.I bridged
pins 2 and 3 on both Analog switches (without pulling them outfirst).
I got the signal all the way to the final amps, and found those tobe
bad too. I replaced those and finally got a picture on my scope.
Sothe
two analog switches and the final two amps were all bad. The X
and YSize pots also broke off so I had to replace those.So, I guess I
just need to wait a few days for the analog switches. Thanksfor the
tip!MattOn Sun, 2 Dec 2007 21:51:32 -0500 (EST), "Christopher X.
Candreva" wrote:
On Sun, 2 Dec 2007, Matt Rossiter wrote:
I\'m trying to figure out a weird issue on a tempest board in the
AVGSection. The game is running blind and I traced the fault down
tothe outputs (pin 2 and 15) of both LF13201 analog switches. I\'ve
put the schematic here and dotted where the good/bad signalsare.
http://games.rossiters.com/images/Tempest.jpg [1]
Does anyone have any idea why the output on pins 2 and 15 of
bothanalog switches would not work when they are getting proper
inputs?
The chip is busted ? :-)All the analog switch does is determine if
the output is inverted or not(for cocktail mode). If you are
replacing it anyway and don't want towaitfor the
new ones to arrive --
pull the chip, put in a socket, jump thepins for one of the signals
(inverted or not invereted) with a piece ofwire and see if it works.If
it's not in a cocktail table and you don't plan moving the board to
acocktail table you could just leave the correct ouput
directlyconnected and not use the switch at all, and have one less
thing to
break.
==========================================================Chris
Candreva -- chris@westnet.com [1] -- (914) 948-3162 [2]WestNet
Internet Services of Westchesterhttp://www.westnet.com/ [3]
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<p>
I'm not sure why. I was looking for any physical damage and I gave th=
em each a slight tug to see if any of them wiggled and two of them snapped =
off like twigs. The rest were fine. I'm pretty sure this board =
was worked on before.
</p>
<p>
Matt<br />
<br />
On Mon, 03 Dec 2007 09:11:53 -0600, Pat Danis wrote:
</p>
<blockquote style=3D"padding-left: 5px; margin-left: 5px; border-left: #101=
0ff 2px solid; width: 100%">
Why did the pots break off? From rough handling/storage or from brea=
king the glue and trying to adjust them?<br />
<br />
Pat D.<br />
<br />
Matt Rossiter wrote:=20
<blockquote>
<pre>
Ok,I almost have it fixed. I think what happened is either a bad 15v vol=
tageregular really wreaked havoc on the AVG and took out a bunch of parts o=
rsomeone may have put in a wrong part (maybe a -15v regulator by accident).=
That's the only theory I can come up with for so many bad IC's. I didn'ts=
ee any physical damage though.I bridged pins 2 and 3 on both Analog switche=
s (without pulling them outfirst). I got the signal all the way to the fin=
al amps, and found those tobe bad too. I replaced those and finally got a =
picture on my scope. Sothe two analog switches and the final two amps were=
all bad. The X and YSize pots also broke off so I had to replace those.So=
, I guess I just need to wait a few days for the analog switches. Thanksfo=
r the tip!MattOn Sun, 2 Dec 2007 21:51:32 -0500 (EST), "Christopher X.=
Candreva"<a href=3D"mailto:chris@westnet.com" class=3D"moz-txt-link-r=
fc2396E"></a> wrote: =20
</pre>
<blockquote>
<pre>
On Sun, 2 Dec 2007, Matt Rossiter wrote: =20
</pre>
<blockquote>
<pre>
I'm trying to figure out a weird issue on a tempest board in the AVGSe=
ction. The game is running blind and I traced the fault down tothe output=
s (pin 2 and 15) of both LF13201 analog switches. I've put the schematic he=
re and dotted where the good/bad signalsare. <a href=3D"http://games.rossi=
ters.com/images/Tempest.jpg" class=3D"moz-txt-link-freetext">http://games.r=
ossiters.com/images/Tempest.jpg</a> =20
</pre>
</blockquote>
<blockquote>
<pre>
Does anyone have any idea why the output on pins 2 and 15 of bothanalo=
g switches would not work when they are getting proper inputs? =20
</pre>
</blockquote>
<pre>
The chip is busted ? :-)All the analog switch does is determine if the =
output is inverted or not(for cocktail mode). If you are replacing it any=
way and don't want towaitfor the new ones to arrive -- pull the chip, put i=
n a socket, jump thepins for one of the signals (inverted or not invereted=
) with a piece ofwire and see if it works.If it's not in a cocktail table a=
nd you don't plan moving the board to acocktail table you could just leave =
the correct ouput directlyconnected and not use the switch at all, and have=
one less thing to =20
</pre>
</blockquote>
<pre>
<!---->break. =20
</pre>
<blockquote>
<pre>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3DChris Candreva -- <a href=3D"mailto:chris@westn=
et.com" class=3D"moz-txt-link-abbreviated">chris@westnet.com</a> -- <a href=
=3D"livecall:(914)948-3162" class=3D"htc">(914) 948-3162</a>WestNet Interne=
t Services of Westchester<a href=3D"http://www.westnet.com/" class=3D"moz-t=
xt-link-freetext">http://www.westnet.com/</a> =20
</pre>
</blockquote>
<pre>
<!---->------------------------------------------------------------------=
--------- =20
</pre>
<blockquote>
<pre>
** Unsubscribe, subscribe, or view the archives at<a href=3D"http://www.=
vectorlist.org" class=3D"moz-txt-link-freetext">http://www.vectorlist.org</=
a>** Please direct other questions, comments, or problems to<a href=3D"mail=
to:chris@westnet.com" class=3D"moz-txt-link-abbreviated">chris@westnet.com<=
/a> =20
</pre>
</blockquote>
<pre>
<!---->------------------------------------------------------------------=
---------** Unsubscribe, subscribe, or view the archives at <a href=3D"http=
://www.vectorlist.org" class=3D"moz-txt-link-freetext">http://www.vectorlis=
t.org</a>** Please direct other questions, comments, or problems to <a href=
=3D"mailto:chris@westnet.com" class=3D"moz-txt-link-abbreviated">chris@west=
net.com</a> =20
</pre>
</blockquote>
--------------------------------------------------------------------------=
- ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.=
org ** Please direct other questions, comments, or problems to chris@westne=
t.com
</blockquote>
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** Please direct other questions, comments, or problems to chris@westnet.com
Received on Mon Dec 3 11:09:45 2007
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