Quoted from swirvin:The left slingshot on my TFTC will not fire in game play or test.The coil is good and will fire when the collector is grounded.Replaced the tip 122,the 2n4401,the 7402 or gate,the 7404 hex buffer, and the pia 6821. The switch does score points.I have no idea where to go from here
Hi there,Have you tested the main transistor and the pre drive transistor(Smaller one) that run that slingshot coil?Did you check the fuse,Pull it out and check with meter.Are there any diodes on the slingshot coil?if so those will also need to be checked.
1.The main transistor
2.The pre drive transistor
3.The coil and the coil diodes(If there are diodes on that coil)The coil very seldom ever goes bad unless it is fried.
All these 3 would need to be tested/checked with a multimeter.Replacing all 3 would be best so you won't be doing the same work over and over again,it is possible you may have shorted that transistor again if diodes,pre driver were shorted/faulty