boesch Posted July 24, 2015 Share Posted July 24, 2015 So I have a CX2600 model that has some issues with a controller port. The left port always registers the button as being constantly pressed or not pressed at all. The joystick still works fine. I've tried multiple controllers and none of them work in the left but they all function in the right. I was wondering if anyone could help me diagnose the issue and potentially find a solution. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted July 25, 2015 Share Posted July 25, 2015 Have you opened up the machine to check for a for a shorted trace from the controller port? If you don't see a short, it time to consult the VCS Field Service Guide and follow the troubleshooting flowcharts. I could be a bad transistor on that line or possibly a bad chip. The flow chart suggests (in order) swap out the TIA chip, the 6507 chip, the RIOT (6532) chip, and finally replace the resistor on that line (R226 for the left controller). Good luck! Quote Link to comment Share on other sites More sharing options...
BigO Posted July 25, 2015 Share Posted July 25, 2015 I think this recent thread may be relevant: http://atariage.com/forums/topic/239419-2600-light-sixer-keeps-reseting-after-game-is-over/?do=findComment&comment=3259543 Quote Link to comment Share on other sites More sharing options...
zylon Posted July 25, 2015 Share Posted July 25, 2015 I think this recent thread may be relevant: http://atariage.com/forums/topic/239419-2600-light-sixer-keeps-reseting-after-game-is-over/?do=findComment&comment=3259543 I would agree. 1 Quote Link to comment Share on other sites More sharing options...
Mef Posted July 25, 2015 Share Posted July 25, 2015 (edited) Since you've got a Sixer, my bet would be it's the hexbuffer chip only found in Sixers. Luckily It's a $1off-the-shelf component, shame they left this out in later re-designs as it tends to protect other ICs by failing first in case of short, static discharge, etc. Check out this thread. PS, it describes the same issue as the thread presented by BigO & zylon above, only in more detail. Edited July 25, 2015 by Mef 1 Quote Link to comment Share on other sites More sharing options...
+RichG1972 Posted July 25, 2015 Share Posted July 25, 2015 I had a sixer with the same problem so rather than hunt down the faulty circuit, I just ordered a brand new populated motherboard from Best Electronics and was good to go Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted July 25, 2015 Share Posted July 25, 2015 Since you've got a Sixer, my bet would be it's the hexbuffer chip only found in Sixers. Luckily It's a $1off-the-shelf component, shame they left this out in later re-designs as it tends to protect other ICs by failing first in case of short, static discharge, etc. Check out this thread. PS, it describes the same issue as the thread presented by BigO & zylon above, only in more detail. If it is indeed the hex buffer, they're 39¢ from Jameco as of this morning - I know, because there's one in the XL series of computers as well, and the one in my 800XL decided to take a powder last night. I pulled one from another machine and fixed the problem for now, but I'll be picking up a few extras soon. 1 Quote Link to comment Share on other sites More sharing options...
thadsilverfox Posted July 26, 2015 Share Posted July 26, 2015 I had a sixer with the same problem so rather than hunt down the faulty circuit, I just ordered a brand new populated motherboard from Best Electronics and was good to go I decided to browse their website and found their consoles to be somewhat pricey. Quote Link to comment Share on other sites More sharing options...
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