newbie help please

mazzeo

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hey everyone im fairly new to this hobby and my ? is my taito double dragon game wont play with the marquee light on, but it doesnt effect my double dragon 2 pcb. the game plays perfect but as soon as i put the light on it gets all messed and im pretty sure i have the right starter and light. thanks guys!
 
I would say that the power supply is not working correctly. Try checking the voltage when the marquee light is on. See if drops to low. Some PCB are temperamental with needing the correct voltage.
 
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volts are the same with the light off, double dragon 1 is the only pcb that acts up with the light on. thanks for the reply!!!!
 
volts are the same with the light off, double dragon 1 is the only pcb that acts up with the light on. thanks for the reply!!!!

Where are you measuring the voltage? Measure the voltage at the PCB with a load. If I would guess, the +5 drops a bit with your Double Dragon 1 when the light is lit.
 
dd

dude thanks so much i turned it up and it now runs perfect i had no idea the ac light would effect dc output thanks again!!!!!!!!!!!!!!
 
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