Re: ms pac voltage trouble

From: tony <sales_at_htbsusa.com>
Date: Fri Mar 18 2005 - 06:53:32 EST

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</head><BODY BGCOLOR="#F0F0F0" ><p><SPAN style="font-size:10pt;">is there a way to test the 2114 ram on the board or do i have to pull all of them and test in </SPAN></p>
<p><SPAN style="font-size:10pt;">my mod-a tester </SPAN></p>
<p><SPAN style="font-size:10pt;">thanks Tony<br /><br /> On Thu, 17 Mar 2005 21:10:23 -0800, John Robertson wrote:<br /></SPAN><SPAN style="font-size:10pt;color:navy;">> If the board produces a good image when you increase the 5VDC</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">> supply then your video RAM has at least one bad IC. RAM is usually</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">> the most susceptible to voltage fluctuations and will show errors</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">> faster than other parts.</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">> Also the fact that the game runs indicates it is not on the Data</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">
> bus, rather it is the video handling circuits...</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">> John :-#)#</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:navy;">> At 9:53 PM -0500 3/17/05, tony wrote:</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:maroon;">>> i am working a a ms pac man with a daughter board all ac voltages</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:maroon;">>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> are fine sound works great its 5 volt line is at 4.95 vdc at c2</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>&g
t; and</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> c3 and the game plays but the graphics are real bad and lines</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> through the picture, the d7 un banded to d8 ubd 13.5 vac and</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> d3</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> to d4 ubd 25.5 vac i pulled it from the game and hooked it up on</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purpl
e;">>>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> the bench to a good monitor and my dc power supply though pin</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> 18</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> and ground and gave it 4.95 volts same thing then i turned it</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> up to</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> 5.75 vdc and bam it all came in fine looks great so how do i get</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:
10pt;color:purple;">>>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> the ac in the game up or the dc on the board up checked for ac</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> in</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> the dc and there is none and checked d9 for a short or leaky</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> and it</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>> was not any help</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:purple;">>>>
</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:maroon;">>> thanks ton</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:maroon;">>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:maroon;">>></SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:maroon;">>> _______________________________________________</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:maroon;">>> Techtoolslist mailing list</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:maroon;">>> Techtoolslist@flippers.com</SPAN><SPAN style="font-size:10pt;"><br /></SPAN><SPAN style="font-size:10pt;color:maroon;">>> http://seven.pairlist.net/mailman/listinfo/techtoolslist</SPAN><SPAN style="font-size:10pt;"><br /><br /></SPAN></p>
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Received on Fri Mar 18 07:49:14 2005

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