Re: Stuck output(s) on G80 X/Y Cards / CPU no LED.

>  
> Appreciate any and all input or ideas.
>  

I sold all my G80 stuff years ago, but can't you just pull the backplane
out of the chassis to work on a boardset? I seem to remember that is how
I used to work on them.

Mit

> Thanks,
> Sent: Tuesday, January 17, 2012 8:46 AM
> Subject: Re: VECTOR: Stuck output(s) on G80 X/Y Cards / CPU no LED.
>
>
>>Anyone have any ' good ' methods for troubleshooting SEGA G80 CPU
>>and / or - X/Y Timing / Control - Cards?
>  
>>I also wonder if I may have a Watchdog issue on the CPU Board itself?
>
>>But if the X/Y Cards provide clocking to the CPU Board and if these are
>>not functioning correctly, then I suspect the CPU may never come up.
>  
>>Again appreciate any ideas that anyone can offer.
>  
>>Thanks,
>  
>
> Sent: Tuesday, January 10, 2012 9:59 PM
> Subject: VECTOR: Stuck output(s) on G80 X/Y Cards / CPU no LED.
>
>
>>I have three sets of Sega G80 X/Y Timing and Control Cards. 
>>All three sets of the ' Timing ' Cards remain stuck a constant voltage 
>>output in the range of 1.50 to 1.66 VDC. Also the ' Control '
>> Card output 
>>remains at 0.16 to 0.22 VDC on all three ' R G B ' ouputs. I suspect
>> that 
>>this may be the reason that my CPU card will not come up, and the CPU's
>>LED remains off. I have replaced the crystal, on the CPU card, Z80 CPU
>>along with memory (2114) on both the X/Y and CPU Cards. I also replaced
>>the LED, itself. So far I get no output and the CPU seems to be non
>> functional.
>
>>As a sidenote, I am using an Original Sega G80 power supply /
>> transformer.
>>All voltages(including the Reset power on voltage) measure as ' Good ' .
>
>>Appreciate any ideas that anyone can offer.
>>Thanks,

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Wed Jan 18 11:23:35 2012