1986 comet no play

dollar

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Dec 3, 2009
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green bay, Wisconsin
when machine is turned on all lights come on.stays in game over mode.diagnostic segment display says 0 test pass only way to start game is to press and hole diagnostic button then it starts. plays well when game is over press free play and it starts ! is this a bad power supply. any info on a system 9 !!thanx.
 
Sounds like a memory problem. did you try turning the game off and back on quickly? try that, and if it works then replace your battery box
 
not the batteries, the battery box. Havent fooled much with system 9s, but had 2 system 11s go straight to diagnostics when turned on, one had a bad box, the other a cold soldier joint on the box
 
Yes, the battery holders do take a shit. If the holder is bad, the board will never see the batteries. Can you measure the voltage (with batteries installed) somewhere on the board thats 'downstream' from the battery holder?
 
dollar

hi guys do i test with or with out power turned on. and what is the purpose of the battery box to start the game! this machine did not come with a instruction manual. but one is coming found on e-bay.
 
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