tec9
Active member
Hey all-
I'm afraid as soon as I mention that this is a 4 player Demolition Derby, people will hit the back button!!! If you don't feel like reading my through this post, just check the question at the bottom.
I need some general advice on the MCR transformer caps. I've been having no luck repairing my 4 player Demolition Derby machine. Now I know not many people have this 4 player machine, so I'm just asking for some MCR advice in general. The problem I am having is with steering wheel controls. In game mode, the cars kinda randomly turn just a bit here and there...they don't go in constant circles or anything, but every once in awhile, the car turns a bit. I've been trying to figure this out, and haven't had much luck. When you turn the wheels the cars do turn, but when you are not turning the wheel, they kinda just randomly turn here and there...here is what I have done.
-swapped main PCB stack
-swapped around all of the optic boards, even tried spares on all the players.
-played around with different voltages on the rebuilt linear power supply
-swapped out the power supply with a MCR switcher from my test bench.
-Triple checked the wiring to the optic boards, and main board...even wrote down the pinouts, which seem to be non-existant in any manual or online.
-drank lots of beers and walked in circles cursing!
So as it stands right now..the game has the original/rebuilt power supply in it, and I feel I've swapped out everything except the large caps in the transformer/ suitcase assembly. Any chance that they could be causing this issue...I'm thinking it's possible because these opto boards get 5VDC and 12VDC, and perhaps the caps are allowing AC ripple through.
So has anybody replaced the big blue caps in a MCR game and have it solve input issues?
-Mark
I'm afraid as soon as I mention that this is a 4 player Demolition Derby, people will hit the back button!!! If you don't feel like reading my through this post, just check the question at the bottom.
I need some general advice on the MCR transformer caps. I've been having no luck repairing my 4 player Demolition Derby machine. Now I know not many people have this 4 player machine, so I'm just asking for some MCR advice in general. The problem I am having is with steering wheel controls. In game mode, the cars kinda randomly turn just a bit here and there...they don't go in constant circles or anything, but every once in awhile, the car turns a bit. I've been trying to figure this out, and haven't had much luck. When you turn the wheels the cars do turn, but when you are not turning the wheel, they kinda just randomly turn here and there...here is what I have done.
-swapped main PCB stack
-swapped around all of the optic boards, even tried spares on all the players.
-played around with different voltages on the rebuilt linear power supply
-swapped out the power supply with a MCR switcher from my test bench.
-Triple checked the wiring to the optic boards, and main board...even wrote down the pinouts, which seem to be non-existant in any manual or online.
-drank lots of beers and walked in circles cursing!
So as it stands right now..the game has the original/rebuilt power supply in it, and I feel I've swapped out everything except the large caps in the transformer/ suitcase assembly. Any chance that they could be causing this issue...I'm thinking it's possible because these opto boards get 5VDC and 12VDC, and perhaps the caps are allowing AC ripple through.
So has anybody replaced the big blue caps in a MCR game and have it solve input issues?
-Mark