Re: Atari Tempest issue

From: Elliot Braun <elliot_at_smartcomputercare.com>
Date: Sat May 12 2012 - 12:40:08 EDT

I don't have a logic probe. Can you suggest a good yet inexpensive one? Or
a method of testing?

Thanks elliot

On Friday, May 11, 2012, Kevin Moore wrote:

> Ok after looking at the schems. You should check the function of H2 LS245
> to make sure the Aux board is getting the signals via the board
> interconnect.
>
> Kevin
>
>
>
>
>
> On Fri, May 11, 2012 at 5:19 AM, Kevin Moore <talon.k@gmail.com<javascript:_e({}, 'cvml', 'talon.k@gmail.com');>
> > wrote:
>
>> 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<javascript:_e({}, 'cvml', '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<javascript:_e({}, 'cvml', '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<javascript:_e({}, 'cvml', '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<javascript:_e({}, 'cvml', '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
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>

-- 
Thanks,
Elliot Braun
Smart Computer Care
SmartComputerCare.com
775-453-4349
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Sat May 12 17:32:49 2012

This archive was generated by hypermail 2.1.8 : Sat May 12 2012 - 18:50:03 EDT