We worked on the Tempest again last night. Changed the Y axis DAC at F10,
same problem. Then we changed both TL-082 op-amps in the Y circuitry (at D11
and D/E13).
The screen was much better, but looked odd. Then I realized we needed to
re-adjust the pots. Turns out, the only pot that really needed adjustment
was the Y BIP pot! That implies to me that the op-amp the BIP control
is attached to (the one at D11) was weak, and finally died, and when we
replaced it with a working one, we had to re-adjust the BIP pot to compensate
for it.
The game is fully functional again!
All we have left to do is clean and lube the spinner with nyogel 779, and
I'd like to install the protection fuses in on the WG6100 HV board as
described in the HV-2000 docs:
http://www.arcadeshop.com/wgxy-fb/wg_install.pdf
Thanks everyone!
___
Ken
On 08/25/11 15:39, Christopher X. Candreva wrote:
> On Thu, 25 Aug 2011, Ken Sumrall wrote:
>
>>
>> http://www.youtube.com/watch?v=KzoSp907Vlg
>>
>> Any clues where I should look? From what I've read online, I should start
>> with the DACs, analog switch and op-amps. Anything else I should look for?
>
> My first thought is a stuck bit on a DAC. The problems look "square".
>
> ==========================================================
> Chris Candreva -- chris@westnet.com -- (914) 948-3162
> WestNet Internet Services of Westchester
> http://www.westnet.com/
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Received on Fri Sep 2 16:35:15 2011
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