Q5 and Q6 are for the pop bumper. I don't see in your notes where you have replaced Q5 (pre-driver).
Do you have a logic probe?
(Topic ID: 285648)
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Black Knight
Williams, 1980
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Quoted from Atari1977:Which manual did you see that in? The copy I have lists Q4 and Q6 for the jet bumper, though I do know Williams manuals are sometimes wrong
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Do not have a logic probe.
The schematic lists Q5 as the pre-driver and Q6 as the driver. Also, there are 2 solenoids with Q4 listed in that table 
Q6 is listed twice as well.
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