Re: Tempest Boards

Jilayne Stanclif wrote:

> I don't know if its just me or everyone, but I have the hardest time
>repairing Tempest's and SW.
>
> Maybe someone with a bit more logged time on Tempest repair can help me
>out.
>
> Here is what I have.
>
> I have one complete working Tempest board so I check out the aux(smaller
>pcb with Pokeys) pcb on the bad boardset and it works.
>
> Problem is definitely on the main big PCB.
>
> Roms are known good as I tested them on my working board.
>
> Watch dog does not reset. Using oscope for display so I know that works.
>Cpu is good tested that on the other boardset.
>
> Displays a bit of junk then the dot just floats around a bit.
>
> I think its in the Vector timing or that part of the circuit. Anyone
>have a faq or known area that is problematic. I don't see any stuck high or
>low pins anywhere and I find it hard to believe that both the X and Y dac's
>and amps would be bad.
>
>Thanks,
>
>Fred
>
>

You may have already done this, but the FIRST thing to do on a Tempest
is to resolder the Molex connectors where the ribbon cable connects the
main to the aux board. These almost always have cracked solder joints.
 Don't just reflow, wick them off and use fresh solder, preferably 63-37
alloy.

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Received on Sun Mar 2 00:47:52 2003