(Topic ID: 160540)
Linked Games
Jack*Bot
Williams, 1995
Topic Gallery
Kansas City, MO
Quoted from LTG:If your 12 volt test point on the power driver board is good, you likely took out U20 on the CPU.
LTG : )
What is U20? And how much to fix??
Quoted from EMsInKC:Uhh, wrong board.
Just meant to be a pic of the message I have on my pin.
Quoted from Casinorun:Just meant to be a pic of the message I have on my pin.
I meant this is an EM board.
Quoted from Casinorun:What is U20? And how much to fix??
U20 is an integrated circuit on your CPU. If yours is socketed, simply pull and replace, relatively cheap. If soldered on, then it costs more if you have a pro experienced with circuit board repair.
LTG : )
Quoted from LTG:U20 is an integrated circuit on your CPU. If yours is socketed, simply pull and replace, relatively cheap. If soldered on, then it costs more if you have a pro experienced with circuit board repair.
LTG : )
Its soldered, all good I do have a local pinball repair shop that ive been in contact with, just going to have to pay up and get it fixed through them.
Quoted from Casinorun:Its soldered, all good I do have a local pinball repair shop that ive been in contact with, just going to have to pay up and get it fixed through them.
The picture you show is of the DMD controller board. The U20 that LTG mentioned in on the CPU/MPU board (bottom left board).
Quoted from PinballManiac40:The picture you show is of the DMD controller board. The U20 that LTG mentioned in on the CPU/MPU board (bottom left board).
Found it in the bottom left, it is socketed, but just my luck its located behind where the battery mount is lol, cant access the chip without taking the battery mount off.
It's easy to remove the battery board to replace U20. Just pop the 4 corners loose. Pull the board out of the game.
Your LEDs show you have +12, so the problem is almost certainly on the CPU.
Real easy to short solenoid voltage to a switch when you're working under the playfield with the game turned on. Always do that sort of thing with the game powered off.
Quoted from johnwartjr:It's easy to remove the battery board to replace U20. Just pop the 4 corners loose. Pull the board out of the game.
Your LEDs show you have +12, so the problem is almost certainly on the CPU.
Real easy to short solenoid voltage to a switch when you're working under the playfield with the game turned on. Always do that sort of thing with the game powered off.
Yeah that was a stupid move on my behalf, just wanted to make sure I switched out every light, rookie move!!! Curious what you mean by my LEDs show I have +12?? So in your opinion its my U20 then??
Quoted from zaza:Check Fuse F116, LED7 is OFF
That would be nice if it were just the fuse!!
It was fuse F116, and fuse F109, I replaced the U20 but it was unneccesary. Lol so now I have an extra U20 for a rainy day. Thank you everyone who commented and made the effort to help me.
Glad you found it.
BTW on some Bally/Williams machines (e.g. Safecracker) a bad connection at the opto board (or in the wiring to it) in the playbox will cause this error on powerup and there is utterly nothing wrong with U20, the +12V, the connector or any of the fuses. Been there chased that one.
Quoted from Casinorun:Yeah that was a stupid move on my behalf, just wanted to make sure I switched out every light, rookie move!!! Curious what you mean by my LEDs show I have +12?? So in your opinion its my U20 then??
The LED under the ribbon cable on the left side of the driver board is the LED indicating the +12 regulated circuit is working.
I was looking at the wrong LED. Forgot this is a +12 unregulated error - they are 2 different circuits.
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