Im having issues with my single totem drop target at the back of the game. If the drop is up, thus its switch is not made then all my switches on the game work fine.
If the drop goes down then the mode start switch and position 6 in the trough fail to operate any more and possibly others too. All these switches are in the top row of the matrix.
I have checked all the diodes in this row, they are correct way round and have desoldered to prove the diodes are working.
I have unplugged all optos in the row one at a time too.
Drop target in up position, all ok, when down problems.
Today i have also renewed the 3 lm339 chips under the playfield that work with the optos, and socketed new chips in.
But still having the same issues.
Anyone else had this problem?
Fault diagnosis ideas welcomed.
Cheers
Moose
If the drop goes down then the mode start switch and position 6 in the trough fail to operate any more and possibly others too. All these switches are in the top row of the matrix.
I have checked all the diodes in this row, they are correct way round and have desoldered to prove the diodes are working.
I have unplugged all optos in the row one at a time too.
Drop target in up position, all ok, when down problems.
Today i have also renewed the 3 lm339 chips under the playfield that work with the optos, and socketed new chips in.
But still having the same issues.
Anyone else had this problem?
Fault diagnosis ideas welcomed.
Cheers
Moose