Re: Atari Tempest issue

Then its most likely a buffer chip not allowing the address and data lines
to talk to the aux. Don't have schematics right now, do you have a logic
probe ?

Kevin
On May 10, 2012 11:08 PM, "Elliot Braun" <elliotsphone@gmail.com> wrote:

> Yes I have done that twice... Thanks for the suggestion though.
>
> Thanks,
>
> Elliot
>
>
> On Thu, May 10, 2012 at 1:14 PM, Rodger Boots <rlboots2@gmail.com> wrote:
>
>> You keep talking about edge connectors, the usual problem on tempest is
>> the ribbon cable connectors between the main and aux boards. Where the
>> pins are soldered to the boards develop very hard to see cracks in the
>> solder. Usual fix is to wick off the solder and resolder with 63-37 solder
>> (Radio Shack calls it "high-tech" solder)---best done with the ribbon cable
>> removed. 63-37 has a high resistance to cold solder joints.
>>
>>
>> On Wed, May 9, 2012 at 11:48 PM, Elliot Braun <elliotsphone@gmail.com>wrote:
>>
>>> Ok, here is the latest.
>>>
>>> I re-did the interconnect and did a continuity test and all is well. I
>>> re-did the connector on the aux board (blade connector that attaches to
>>> side of the PCB) with all new crimp on ends.
>>>
>>> Voltages on Aux are: +22 is +23.6 -22 is -23.5 +5 is +5.06 -5 is -5.06
>>> Voltages on main board are same +-.01
>>> Voltages on Audio board are same +- .01
>>> all voltages taken from the loop lugs
>>>
>>> Here is a strange thing: if I disconnect the edge connector on the aux
>>> board the game fires up in to a semi demo mode, full color but things seem
>>> to be missing.
>>> When connected it is same old thing, in test mode EPQM is up no response
>>> to spinner. In normal mode spot killer activates.
>>>
>>> I am thinking a new aux board may help but it seems so strange that
>>> everything is out on the aux!
>>>
>>> Is the 23.5 voltage the cause? If so how do I fix it?
>>>
>>> Thank you all for the help so far. Hopefully soon I can try to avoid
>>> the spikes again!
>>>
>>> Thanks,
>>>
>>> Elliot
>>>
>>>
>>>
>>> On Tue, May 8, 2012 at 5:28 PM, Matt J. McCullar <mccullar@flash.net>wrote:
>>>
>>>> **
>>>> All those letters make me think that the CPU board believes the
>>>> Auxiliary board isn't connected. Make SURE the Aux board is getting +5
>>>> volts. Reseat all the socketed chips on the Aux board (as in, pull them
>>>> out, clean contacts, reinstall them). Clean contacts on edge connectors
>>>> with an eraser. Reseat the Molex connectors on the Reg/Audio II board.
>>>> (Also reseat all the EPROMs on the CPU board.)
>>>>
>>>> Avoid spikes!
>>>>
>>>> Matt J. McCullar
>>>> Fort Worth, TX
>>>>
>>>>
>>>
>>>
>>
>

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Received on Fri May 11 06:19:50 2012