machrcode Posted May 30, 2017 Share Posted May 30, 2017 when you turn it on the game just keeps reseting ( i had donkey kong in it) I had buffer chips on hand and replaced it but no change if you hold the reset button down it stops but you can not play any ideas I have not swapped anything else but have spare chips on hand any help would be appreciated, Nick Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted May 30, 2017 Share Posted May 30, 2017 (edited) I'm not sure because I haven't had experience with that particular issue. But C227 I'm thinking may could have possibly failed open causing the reset input to float and behave erratically. EDIT: If you can try swapping C225 and C227 and see if you notice any change. Oh, and I would try a different cartridge first too if you can get a hold of one. Edited May 30, 2017 by SignGuy81 Quote Link to comment Share on other sites More sharing options...
Atari-Collector Posted May 30, 2017 Share Posted May 30, 2017 I'd check the voltage at the 7805.. see if it's running hot too.. voltage dips can cause all sorts of weirdness 1 Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted May 30, 2017 Share Posted May 30, 2017 Open it up and clean the bejesus out of the reset switch with electrical contact cleaner. Inspect the traces along the switch board to the ribbon cable, then inspect the cable for obviously broken or shorted wires. Finally, consider replacing IC's. I think the 6532 RIOT chip handles console switches but I'd have to look at the schematics to confirm. Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted May 30, 2017 Share Posted May 30, 2017 (edited) Open it up and clean the bejesus out of the reset switch with electrical contact cleaner. Inspect the traces along the switch board to the ribbon cable, then inspect the cable for obviously broken or shorted wires. Finally, consider replacing IC's. I think the 6532 RIOT chip handles console switches but I'd have to look at the schematics to confirm. I second all of that, and yes you are correct about the RIOT chip. To OP that cap I mentioned earlier C227 I forgot to mention the first time also check the solder joints on each side of the cap too cause that could also cause an open and make the input float if you have cracked solder joints there. If so try reflowing those joints first before swapping caps like I first mentioned. Edited May 30, 2017 by SignGuy81 Quote Link to comment Share on other sites More sharing options...
machrcode Posted June 1, 2017 Author Share Posted June 1, 2017 Voltage 6.3 swapped the riot chip took the reset button off swapped c227 c225 nothing worked I might give up? any other thoughts Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 (edited) Voltage 6.3 swapped the riot chip took the reset button off swapped c227 c225 nothing worked I might give up? any other thoughts that is too high voltage at the 7805. You are checking the 3rd pin right? You may need to replace the regulator. Edited June 1, 2017 by SignGuy81 Quote Link to comment Share on other sites More sharing options...
machrcode Posted June 1, 2017 Author Share Posted June 1, 2017 I guess it was about 10v on the one side and 6.3 on the other Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 I guess it was about 10v on the one side and 6.3 on the other Your output voltage is too high. You need to change the voltage regulator, it shouldn't be that high(6.3) on the output. Quote Link to comment Share on other sites More sharing options...
machrcode Posted June 1, 2017 Author Share Posted June 1, 2017 OK next chance I get I will put a new one in and let you guys know what happens thanks again for the help Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted June 1, 2017 Share Posted June 1, 2017 Yeah that's too high. You should be getting between about 4.95 and 5.05 V if the regulator is within spec. Good news is it's a cheap and easy fix. Bad news is it's inconvenient to order one 7805. Buy a bag of 10-20 of them and keep them handy as long as you own old Ataris. 1 Quote Link to comment Share on other sites More sharing options...
machrcode Posted June 1, 2017 Author Share Posted June 1, 2017 I had them on hand swapped it and now everything is fine thanks for the help it was very much appreciated 2 Quote Link to comment Share on other sites More sharing options...
SignGuy81 Posted June 1, 2017 Share Posted June 1, 2017 I'd check the voltage at the 7805.. see if it's running hot too.. voltage dips can cause all sorts of weirdness And first place goes to ^ Quote Link to comment Share on other sites More sharing options...
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