Re: Fixing Asteroids explosions

I have never seen a Deluxe that does this. I've almost never seen an Asteroids that doesn't. I have one -05 PCB that doesn't. I pulled the -02 PCB I was running in my Asteroids which does this and visually inspected all the 161s. None of them match the date codes I listed.

On Feb 3, 2013, at 12:01 PM, Altan Stalker <pinball@aaarfamily.com> wrote:

> Just Asteroids or Deluxe also? I have not noticed it on Deluxe.
>
> On Feb 3, 2013, at 2:59 PM, Andre Huijts <a.huijts@upcmail.nl> wrote:
>
>> FYI:
>>
>> I've noticed this on my Asterock (Italian Asteroids bootleg) too and always wondered it it was a defect because I too saw it on most Asteroids cabs.
>>
>> Maybe worthwhile to have a look the Asterock schematics too....
>>
>>
>> Op 3 feb. 2013, om 19:47 heeft Ian Eure <ieure@mac.com> het volgende geschreven:
>>
>>> Pretty much every Asteroids I've ever played has had an intermittent issue where explosions sometimes display as a flat, inconsistently dashed line instead of the animated dots. They can be either horizontal or vertical, it can happen one in five or ten or fifteen explosions. Everything else works fine. I have heard that this is caused by bad LS161 counters.
>>>
>>> I'm wondering if this is usually the case, and if so, whether there are any good techniques to isolate the faulty ICs. There are a ton of these on the PCB and I don't want to socket everything to track down a single faulty IC. I don't have an IC tester, scope, or any advanced diagnostic tools, just a logic probe. The problem is so intermittent and only occurs during gameplay, so it seems like the probe isn't going to be much help in this case.
>>>
>>> I read on the (sadly now defunct) usbdesigntech.com site that the following 161s were very prone to failure:
>>>
>>> Type SA 74LS161 with a date code of 8108
>>> Type SA 74LS161 with a date code of 8045
>>> Type SA 74LS161 with a date code of 8046
>>>
>>> I could start by swapping any of those I find, but I was curious to know if there is a better way to do this.
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>>
>> Andr?? Huijts
>> andre.huijts@upcmail.nl
>>
>>
>>
>>
>>
>>
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>
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Received on Mon Feb 4 14:36:51 2013