Gottlieb Solved The Incredible Hulk (Gottlieb, 1979) Weak 'A' and 'B' solenoids

[Vannos]

I'm wondering if anyone has any insight into why the "A" and "B" shooters are weak on my Hulk. The "A" is especially weak and cant even launch the ball out of shooter. B is much better, but still feels weak.

Additional info:
I've verified the +24 is OK. Both shooters are hooked up to replacement MJ2955 under-mounted transistors. Pull-up resistor mod not done (but I tried it with jumpers and it made no difference.) I'm running a Pascal PI-X4 all-in-one board. Both coils are new A-5194s with new sleeves. Resistance checks out ok, and both contain new diodes.

Other coils on the machine are strong (target bank resets, knocker, houthole.)

If you place your finger in front of the A shooter it has no power and makes a humming noise under resistance.

Finally, the old coils which were there before replacing them with new ones were no better (suggesting my new coils are ok.)

Any insight would be helpful, Thanks!

 

[pinballdaveh]

things to check. are the kicker arm pivots working freely and not gummed up, do the bakelite links have excessive wear or play. using a dmm with the wires unsoldered to the under playfield transistors ,do the junctions read the same. poss. 1 of the transistors has been weakened and needs to be changed. since the under playfield transistors are capable of driving higher powered coils like a bank reset coil , you might try installing a stronger coil like maybee a pop bumper coil

 

[Vannos]

Thanks, its much better now!

The arm was moving freely but the pin which connects the arm to the bakelite was very loose. I removed the arm assembly and hammered the pin in tightly, reassembled and it works much better. There is still a little play but its not too bad.

I also first checked the values with my dmm of the transistors, they were ok.

As interest to anyone else, I would def consider adding stronger coils to these two shooters in the future.