Arcade Collecting > Pinball
Playmatic Chance MPU Problem
DarkSide:
Something fishy is going on.
The Ball dispenser keeps activating every time the slingshots are activated, but only the slingshots, any thoughts on that ?
Short Circuit, PCB failure, Contacts ?
DarkSide:
It does have a test program, and the strange thing is when activating that every coil on the playfield activates as it should.
But the ball dispenser keep trying to kick a ball every 10-15 seconds, it should only happen once, it smells a bit like a MPU failure ?
Edit: Sometimes when i turn on the machine it also kicks the ball out, so logic failure sounds possible, but it only activates once.
DarkSide:
--- Quote from: pinballjim on September 15, 2011, 04:24:26 pm ---If it's engaging every 15 seconds that the game is on and playing, even without you knocking the ball around, you've got a board problem. If there's a diode anywhere in the wiring associated with that switch, I'd replace it first. It could be on the actual switch, it may be on a board inbetween the wiring and the MPU....
If that doesn't do it, my advice would be to defeat the ball trough switch connection at your MPU and see if the coil is still engaging. It's sounding increasingly like you do have a board problem, but this way you can be 100% sure.
--- End quote ---
I will try and disable that switch tomorrow and see what happens, when game is playing the ball dispenser only activates when the slingshots are active, nothing happens when the pop bumpers, drop targets, flippers are used.
Its only on the test program it keep activating the ball dispenser every 10-15 seconds, can a dead diode really make that kind of problem ?
ChadTower:
--- Quote from: pinballjim on September 15, 2011, 04:02:06 pm ---Way to check that is to really gap that ball trough switch or snip a wire to one of the leads.
--- End quote ---
I usually just put cardboard between the contacts for this.
DarkSide:
Okay a little update, took the switch out of the circuit, and it still does the same, tried activating the switches under the playfield, and it only happes with the switches for the slingshots, also just by activating them without the coil is active, followed the wire to the MPU at connector 03, but so far no solution.
Edit: Disconnected the wire for the scoring switches for the slingshots and now the game runs, but i cant see how a set of scoring switches can make the ball dispenser freak out, unless there is something wrong with the MPU board, ive also found out that its not just the ball dispenser freaking out when it happens, its all the coils that activate for a short period of time.
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