Gottlieb system 80 Blackhole issues

ixtlann

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Gottlieb system 80 black hole up kicker from lower playfield to main playfield doesnt work.
Things i have tried so far.
replaced under play field mounted transistor, coil, and driver board transistor q15,manually ground transistor q15 tab does nothing. fuse is good

I need this information
can some one please verify q15 is the lower playfield to main playfield upkicker transistor.


Next step?
i am thinking possible the diode on the coil has a dead short but would that cause lock on or blow fuse?
if i ground under playfield mounted transistor body it should test wiring and coil/ fire right?

I was working before...
b4 this it was working but locked on during a bad power up, and fried coil.

8-5-11
Update. Cut leg off one side of diode, now coil can manually fire with under pf mounted transistor. So diode was def bad, no surprise there.But still not fire by grounding tab on driver board.
If the shorted diode across the terminals fried the under pf mount transistor, that would match my symptoms. Will have to continue later at work for rest of day. Comments suggestions?
 
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how do i verify power to the coil? big wire to ground with meter?
 
Did you check the fuse will a meter? Don't trust visual fuse testing.

If the coil diode were short, I think I'd expect the fuse to blow. Also, it's easy to check for a shorted diode.

Do the lower PF drop target banks reset OK?

If you briefly jumper the non-banded side of the coil diode to GND, does the coil activate?
 
Update. Cut leg off one side of diode, now coil can manually fire with under pf mounted transistor. So diode was def bad, no surprise there.But still not fire by grounding tab on driver board.
If the shorted diode across the terminals fried the under pf mount transistor, that would match my symptoms. Will have to continue later at work for rest of day. Comments suggestions?
 
wait you're grounding the tab of the coil to the driverboard transistor ?
isn't it a small mps45 transistor ? that's just enough to drive 2 lamps - not coils

what you do is not going to work as that transistor is not powerful enough - and you can damage it this way

that's what the underpf transistor is for - driverboard transistor has only enough power to drive the underpf transistor, that one is more powerful and drives the coil

if the driverboard transistor could handle that load, there wouldn't be a need for an extra transistor under the pf..
 
wait you're grounding the tab of the coil to the driverboard transistor ?
isn't it a small mps45 transistor ? that's just enough to drive 2 lamps - not coils

what you do is not going to work as that transistor is not powerful enough - and you can damage it this way

that's what the underpf transistor is for - driverboard transistor has only enough power to drive the underpf transistor, that one is more powerful and drives the coil

if the driver board transistor could handle that load, there wouldn't be a need for an extra transistor under the pf..

i tried grounding the un pf transistor, it fires no with diode cut off the coil lugs.
still cant fire it by grounding tab on driver board which should drive under pf, and in turn fire coil.
I believe i did it correctly, please correct me if i am wrong.

side note picked up enough supplies to pope bumper driver board fixes mandatory mods x10 pbdb's since have like 5 sys 80 machines!
also ordered some new pins since my a1j5 normally closed titl switch harness plug has abd contacts and causes random resets etc, potentially my core problem that made me lock on and burn once a years for last 3 or so years!!!!
 
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