Laser Ball
Williams, 1979You're currently viewing posts by Pinsider grumpy.
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Quoted from Atari_Daze:the type 89 lights stay lit constantly (LEDs I did not think to try incandescent).
LEDS will always stay lit in a 100% perfectly fine machine, the warming resistor is keeping them on by supply just enough current to light them.
Quoted from Atari_Daze:I'll replace missing components, install incandescent bulbs and try again.
Let us know what doesn't work after you put it back together. PS, ease up on the coffee and get some more sleep before the repairs. 
Quoted from Atari_Daze:Question, would removing the warming resistors allow that circuit to support LED 89s?
Yes.
Quoted from Atari_Daze:I've now cooked something else, hopefully NOT the new mpu
Sorry to say that it is most likely the MPU that was damaged. By reversing those two connectors you sent unreg 12 volts into U-6. If U-6 was damaged then the displays wont be strobed on, but the rest of the MPU will work correctly.
Yes that is the chip I was referring to. It operates at 2-6 volts, you sent @ 14 volts to it. I would still test if it was me.
Quoted from Atari_Daze:20-23 pulse
1-10 NO pulse, they were all HI
Sounds like it has no more magic smoke in it. 
Quoted from Atari_Daze:all solenoids banged once upon turning on game
Can't happen if you have J-9, J-11 and J-12 disconnected.
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