Re: Where to start on Missile Command PCB repair

Hey Kevin,

Thanks for the response. I guess I should have started out saying I
did check the voltages, +5 is right at 5.01, +12 is 11.98, and -5 is
-5.01 I believe, they were all basically spot on. How do I check the
clocks? I've verified the roms are correct with my programmer.

Thanks
Grant

On Wed, Oct 30, 2013 at 9:11 AM, Kevin Moore <talon.k@gmail.com> wrote:
> Like all boards, make sure you have correct voltage going to them.
> Then start out checking clocks, then check to make sure the roms are reading
> correctly, then the ram. That's a good starting place.
>
> You'll also want to find a 6502 pod, sell the catbox, make a nop to use with
> the 5004a with a clock divider to get atari signatures, learn how to use the
> fluke 9010a Then Practice Practice Practice.
>
>
>
> On Wed, Oct 30, 2013 at 7:32 AM, Grant Thienemann
> <grant.thienemann@gmail.com> wrote:
>>
>> Hey Guys,
>>
>> I've got a stack of Missile Command PCBs that don't work and I need
>> some guidance on where to start. Here is what I have done with my
>> first PCB.
>>
>> Checked the PCB in test mode, doesn't nothing, just an audible hum
>> Felt all the chips to see if any are hot, none were warm to the touch
>> Replaced all the 4116 ram with sockets and cleaned the ram legs, still
>> nothing.
>>
>> I have the following equipment at my disposal though honestly, I don't
>> know how to use some of it.
>>
>> HP Logic comparator
>> HP 5004a <-- haven't used them yet
>> Atari Catbox <-- haven't figured out how to use it correctly yet
>> Fluke 9010a but no 6502 pod :-(
>> Logic Probe <-- haven't used it yet
>>
>> Any information would be fantastic!
>>
>> Thanks
>> Grant
>>
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>
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Received on Wed Oct 30 09:21:01 2013