I'm fixing a STTNG that I bought not to long ago. I'm trying to deal with both cannons that are moving way to slow in game mode but move perfect in test mode (with no load - opto beam unbroken).
I've searched around and found more topics on this matter with a solution saying the shafts in the cannons should be taken apart for cleaning and thereby removing the problem. So I've done just that but still struggles with the cannons being to slow.
I found that the cannons turn slow as a result of closing the opto in the loading part of the cannon. So if I break the beam the cannon will slow down and if I remove the object breaking the beam, the cannon will regain it's speed. I guess you can say this proves that it's NOT grease slowing the cannons. I mean - would anyone suggest that the grease is reacting to breaking the beam on the optos
I've also found an solution that says it could be the transistors controlling the cannons. And others saying it could be the 12v on the power driver board. To target that, I've swapped the PDB with another pinball - but this has not cleared the problem. I guess this eliminates the PDB as the source of the problem?
I've also swaped the opto board in the play field. That also changed nothing. Thinks we can rule out the opto board also then?
I've tested the cannons in the test menu and both register their switches correct as they turn. So the physical switches under the cannon also seems to be fine. I've also looked at the switch matrix and found that all optos registers as they should.
So - I'm stuck here hoping some of you can point me in the right direction.
Cannons move slow in game. Moves perfect in test mode if there is no load (opto beam is not broken). PDB has been swaped. Opto board has been swapped. Grease on the shaft of the cannons has been removed. So what's next ??