Elektra
Bally, 1981I have a few switches out that all seem to have the same common wire (white with brown stripe)
The switches are: middle top standup, middle main standup, middle lower left and right, left out lane, and the 2 shooter lane rollovers.
I've redone the connectors on the MPU and checked the connectivity to the switch.
Any suggestions?
PIA socket with an associated open pin could cause your effect, or even a bad PIA for that matter. Follow that line back towards the PIA using the manual. See if you have continuity from the pia leg to the first component stop (i think would be a resistor /cap junction of top of my head).
Logic probe at the PIA while someone closes switches too.
Quoted from brenna98:Need help bump..
i had the same issue and troubleshot it by moving the standup targets around. they are indeed tied together which is f'd up in my opinion. mine ended up being on the lower PF. I replaced the diode and capacitor on the standup and it fixed everything else
Ok, this issue is still driving me nuts.
I redid all the connectors on the MPU and solenoid driver board, replaced all the caps and diodes on the associated switches, and just rebuilt the bridge rectifier board. Still, no response from the switches : (
I know that the J2 connector has all the switch pulse and return wires, but these all look to have good connection running from the beginning of the wire to each switch.
Looks like white w/brown is the return wire and this has connection when I touch all switches.
What's weird is, sometimes all the switches will work, but only for a few hits, then they go out again.
Any more suggestions for me to try???
Run a test wire from the brown/white MPU pin to any switch in that switch line. Should do the trick for testing and maybe perm resolution.
Quoted from brenna98:Ok, this issue is still driving me nuts.
I redid all the connectors on the MPU and solenoid driver board, replaced all the caps and diodes on the associated switches, and just rebuilt the bridge rectifier board. Still, no response from the switches : (
I know that the J2 connector has all the switch pulse and return wires, but these all look to have good connection running from the beginning of the wire to each switch.
Looks like white w/brown is the return wire and this has connection when I touch all switches.
What's weird is, sometimes all the switches will work, but only for a few hits, then they go out again.
Any more suggestions for me to try???
Found the issue!
After rebuilding the solenoid driver board, bridge rectifier board, and repining all the connectors, and replacing the diodes and caps on the associated switches.
I found short was traced to the wires going to the coin door. The bundle of wires was being pinched over the years by the coin return mech, so this was grounding out those switches.
I guess the lesson learned here, is that not all switches are listed in the matrix; cabinet switches are not listed and can be the cause.
Quoted from brenna98:I guess the lesson learned here, is that not all switches are listed in the matrix; cabinet switches are not listed and can be the cause.
Yeah they separated the playfield matrix from the cabinet matrix in the schematics. I wish they would have included a matrix that overlays the two, but no luck so you have to go investigate manually.
Quoted from brenna98:Found the issue!
After rebuilding the solenoid driver board, bridge rectifier board, and repining all the connectors, and replacing the diodes and caps on the associated switches.
I found short was traced to the wires going to the coin door. The bundle of wires was being pinched over the years by the coin return mech, so this was grounding out those switches.
I guess the lesson learned here, is that not all switches are listed in the matrix; cabinet switches are not listed and can be the cause.
nice piece of work man!
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Wind Point, WI