That indicates that a switch (most likely an opto) is active when it shouldn't be.
Use the test menu to clear all the balls then put the machine in switch test and check all optos, then leave it in switch test for 20 mins to see if any optos change status (to find a flaky opto). If nothing then thump the playfield with the palm of your hand and see if any optos are triggered.
I've a sneaking suspicion that you may need to change a capacitor on the 12-way opto board but try the above tests first to help rule out other possibilities.
Hi Moonraker,
Interesting, I had played it for a lot longer yesterday than I thought, probably 10 hours. (A bit embaressed
) My wife was playing for a bit.
So, turned the machine on today, ran the switch opto tests, all correct, closed when should, open when ball goes through. Started to play the machine, all working correctly as it should, no issues with missing balls or left gun firing. Not sure how long I have been playing exactly today but maybe 1 to 1 1/2 hours, the issue started to appear again,
So the issue appears when either the machine is hot (played for quite a bit) or just when its played for a bit
Would you think this is a capacitor on the 12 way opto or something else? or too much playing! (it is old! !)
Ran all the switch tests again, after it had been played (without switching the machine off, all correct and playing as it should)
Many thanks for your help.