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Use the button on the MPU or the coin door button to get to switch test mode.
Does the start button register? Does both ball trough switches register? note that it only shows you the lowest switch number closed... so open all the switches... ie raise drop targets.
Quoted from whizz:I just powered the machine up again.7 flashes -everything reset but would not start a game.I turned power off and back on and it booted again.I pushed the self test button and lamp test worked.pushed again and all displays counted properly but top right pop bumper picked up several times during this test.It had not done this before.All solenoids pulled in and dropped out in correct order.Sound worked but was scratchy.switch test shows #21 which my schematic shows to be drop target #4 .Switch looks good,diode tests good.
in test mode the CPU will fire the pop bumper solenoids when the switch gets closed in most games and I think this includes Xenon, so the CPU is thinking that switch is getting closed. The pop bumper will probably have a capacitor across the switch on the playfield. You can snip one leg loose and see if that fixes the pop bumper firing. The caps go bad and can cause that problem.
To help isolate issue to the PF or MPU try to unplug the PF connector while in switch test and see if the stuck switch clears. MPU J2, top right. You can also try unplugging the cabinet switches, J3 to see if that makes the PF switches behave.
Quoted from whizz:The start button does nothing after it boots.In self test I can use the start button to change high score etc
The CPU must not be seeing the balls in the trough then. Since this is a multiball game it checks to make sure both ball trough switches are closed before it starts a game.
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Newcastle, OK