I was adjusting the right pop bumper stack under the play field with the power on. I touched the EOS switches and heard a hum and blew a fuse on the power aux board. I replaced fuse and this is what happens: This happens ONLY when I start a game NOT when just powered up. when I press the credit button the right pop bumper locks up.... I thought it might be a 1N4003 #19 diode on the power aux board but that did not cure it. If I unhook the ground thin wire on the right pop bumper everything works as it should. HELP!

#2 9 years ago

BKB

the96stang

Bushey Bro's

Enfield, CT

12y 122K 2,940 16 13

Sell it to me, youve caused thousands of dollars in damage and the game is worthless.....

I kid...

Anyway, sounds like you may have blown a transistor, though I would have thought it would lock on at power up. My other guess is that you messed up the switch matrix. Nothing else is acting funky?

#3 9 years ago

ECS

smersh

Pinside member

Rumford, ME

11y 40,050 598 30

nope every thing works great. I ground transistor 73 and it pulls the pop bumper. I was not to think that it could be a pre driver?

#4 9 years ago

KJA

tonedef131

Pinside member

Fort Wayne, IN

9y 55,050 368 18 9 1

We've been troubleshooting the same problem on a friends machine for a couple months and have yet to find a solution. Good luck, I'll keep an eye on this thread and post if we find a solution.

#5 9 years ago

DLD

Dewey68

Pinside member

Plainfield, IL

12y 66,800 2,503 4 15

OP
Quoted from smersh:
when I press the credit button the right pop bumper locks up.

What is the "credit button"? If you put the game in switch edge test mode, what happens when you press the "credit button"?

#6 9 years ago

ECS

smersh

Pinside member

Rumford, ME

11y 40,050 598 30

the credit (start) button. I will do the switch edge and see.

#7 9 years ago

DLD

Dewey68

Pinside member

Plainfield, IL

12y 66,800 2,503 4 15

Okay, wasn't sure if that's what you meant or one of the switches in the coin mechanics.

Does Taxi trigger the solenoids to reset the Marilyn and Pin-bot drops at the start of the game even if they are up? If so it could be related to that. It sounds like you must have introduced solenoid voltage into the switch matrix. You would think that if it was tied with the pressing of the start button it would fire and stop, not lock on.

1 week later

#8 9 years ago

ECS

smersh

Pinside member

Rumford, ME

11y 40,050 598 30

bad zen 1/2 watt diode on cpu board. Fixed

#9 9 years ago

KJA

tonedef131

Pinside member

Fort Wayne, IN

9y 55,050 368 18 9 1

Can you specify which one it was? I know we replaced one, but it may have been a different one.

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