Missile Command Issues

JBell

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Feb 21, 2011
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Pella, Iowa
I have a Missile Command mini that is having issues. The game will not function in either test or run mode, the screen just shows a putrid green color. When starting the machine, test mode or normal, the lower coin counter attempts to cycle. The counter doesn't actually increment it just clicks. When in normal mode you can see the cycles as glitches on the screen.

Board voltages:
5.01 volts
-5.26 volts
12.01 volts

Any input would be appreciated. Thanks.
 
Sounds like it's constantly resetting. Try the usual suspects yet? Pull and re-seat all the socketed chips as well as the edge connector. Also try grounding the w/dis line (watchdog disable). Connect a wire from that pin to a pin marked ground and see if it will go into test mode.
 
I pulled and cleaned all the socketed chips and cleaned the edge connector. The game fired up in test mode and everything checked ok. I switched it to game mode and started to play. Within 15 seconds the game reset again and the reset cycle continued about every five seconds. Any ideas? Thanks in advance.
 
sounds like your power supply is sending some ripple on the 5vdc .....check the power supply for bad caps.
 
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