Terminator 2: Judgment Day
Williams, 1991Could someone do me solid and post a pic of the proper way to wire the ball popper switch behind the skull. I had a wire pop off which I did solder back on. However the switch is still dead as well as other switches in that column of the matrix. Just want to make sure it’s correct.
Thanks!!!
Another update. I tried switching out the socketed uln2803 chip. Still have the whole column dead. Is it possible the socket is bad?
Quoted from ruddiger52:I had a wire pop off which I did solder back on.
Look at all the other switches in your game. All wired the same. White wire and black end of the diode to a lug, green wire to a lug, silver band end of the diode to a lug.
Do you have a broken wire from CPU to first switch ?
Remove the column connector that is out from the cpu and with a wire and diode see if the CPU has an issue or it is good and problem lies out in the game.
LTG : )
If there are two green wires do they go to the same lug?
I soldered the broken green wire to the lug with the other green wire.
I tried multiple chips and having the same issue. Normally When I blow that chip things go haywire. Never had one dead column.
Could a fuse be the issue?
Will try pulling the connector tonight.
Thx for the help !
Thanks for that. Does the number 07 on U20 correspond to the 07 on the j207 connector? Should I be figuring out if those have continuity? According to the matrix 07 is the column that is dead.
Quoted from ruddiger52:Does the number 07 on U20 correspond to the 07 on the j207 connector?
Yes, but the easiest way is to check with a jumper.
Unplug J206 to J209 + J212 and go into switch-test
see animation:
https://pinside.com/pinball/forum/topic/wpc-89-cpu-board-info#post-3872333
Quoted from zaza:Yes, but the easiest way is to check with a jumper.
Unplug J206 to J209 + J212 and go into switch-test
see animation:
https://pinside.com/pinball/forum/topic/wpc-89-cpu-board-info#post-3872333
Thanks for Jumping in Zaza. Trying to jump on while traveling is so difficult.
Ok so I did the jumper test. The number 7 pin on 206 does not register any switches. The rest of the pins seem fine. Since I’ve tried multiple new chips in u20. Possible the socket is loose? Or am I looking at a larger issue??
Thanks for all the help!!!!
Could be a few things.
1st you want to know if the socket has been installed the proper way.
Machine OFF
Is there continuity between U20-12 and J207-7
And is there continuity between U20-7 and U14-15 (orange 7 in picture above)
If both connections are ok, you will need a logic probe to see if the line is pulsing at U14, U20, J207
Yes there is continuity between U20-12 and J207-7
Yes there is continuity between U20-07 and U-14 on the 7 pin
The U-15 chip however only had continuity between its top left pin and U20-07 orange. No other combination of pins between those chips had continuity
If you are saying that U14 pin 15 (orange 7) has continuity with the ground of U15 (blue square), then either U14-15 is stuck LOW or U20-12 is.
Or maybe a short somewhere on the traces
U20 is on a socket so when chip is removed from it and there is still a short to GND, only 2 options are left.
Sorry I didn’t test that U14 pin 15 (orange 7) has continuity with the ground of U15 (blue square),
What I did find was that the u15 (blue square) has continuity with U20-07. But no other pin from u15 has continuity with any pin on u20
If U20-7 has continuity with U15 pin 10 (blue square) , then there is a short somewhere to GROUND.
Are there signs of other repairs on this board ? (besides socket on U20).
All readings in the videoclip are as expected.
That means that U14 pin 15 and/or U20 pin7 (orange 7) is/are shorted to Ground.
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