double dragon

signguy

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bardstown, Kentucky
i have a double dragon that the player one always goes into the wall it wont let me go up or down but let me go left and right i have taken it apart and tried bypassing the stick to see if it would work but doesnt any help would be great.or if any one lives in the bardstown ky area maybe they can fix it and make a little money

added:
i have taken the board out and put it another machine and it does the same thing
 
Last edited:
i have a double dragon that the player one always goes into the wall it wont let me go up or down but let me go left and right i have taken it apart and tried bypassing the stick to see if it would work but doesnt any help would be great.or if any one lives in the bardstown ky area maybe they can fix it and make a little money

added:
i have taken the board out and put it another machine and it does the same thing

At least now it is narrowed down to a board level issue (assuming other things work fine in the cabinet you tried it in :) ). Good call trying it in another cabinet.
 
At least now it is narrowed down to a board level issue (assuming other things work fine in the cabinet you tried it in :) ). Good call trying it in another cabinet.
so is there a chip that controls that or is it easier to just replace the board?
 
Use a logic probe on the input pins for the controls that aren't working.

They should be tied logic high and go low when the control is activated. If they are not at logic high then either the controls or wiring harness is shorted to ground (which is not the case since you swapped the board into a different cab) or there's a chip or resistor pack on the inputs that is open.

Follow the trace back from the edge connector to figure out which resistor pack or IC that the input goes to and replace it.

RJ
 
do you have to use a logic prob to do it or can i use a volt meter i have never worked on anything like this before so i dont want to break it even more than it is
 
Take your meter and put it on diode check and find you input I.C. and put your positive lead on your ground pin and check each leg for a diode reading. There should be a pattern depending on the ic which leg will give a diode reading. some might have every leg a diode reading or every other leg. Now look for one reading that does not look right.
Also check your resistor packs if it has one by the edge connector, maybe it has a couple of open resistors.
find a schematic and follow the edge connector in and find the right pins on the ic and jumper it to ground and see if guy moves correctly then.
 
Take your meter and put it on diode check and find you input I.C. and put your positive lead on your ground pin and check each leg for a diode reading. There should be a pattern depending on the ic which leg will give a diode reading. some might have every leg a diode reading or every other leg. Now look for one reading that does not look right.
Also check your resistor packs if it has one by the edge connector, maybe it has a couple of open resistors.
find a schematic and follow the edge connector in and find the right pins on the ic and jumper it to ground and see if guy moves correctly then.


ok thanks i will try that
 
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