(Topic ID: 309324)

System 11a Power issues?

By dsquared_314

1 year ago

Topic Stats

  • 9 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by wayout440
  • No one calls this topic a favorite


Linked Games

#1 1 year ago

I turn it in, press start, and it acts like it’s going to kick ball out then goes to game over. Press start again and it works fine.
Then during game play, noticed during multiball, it stops and end game? Sometimes it does fine and plays like normal.

Power issue? Maybe tilt issue (I’ll check that)

#2 1 year ago

If it were a power issue, the game would normally reboot, not go into game over. If it were a tilt, you would usually get a tilt warning or slam tilt notice on the display. I'd start by going into the diagnostics and checking everything especially switch functions and coil tests to look for some possible triggering event. My guess is this is some kind of logic failure: bad PIA, RAM, CPU etc...

#3 1 year ago

Logic power dropping possibly, start simple first, replace the caps on the power supply. Big Daddy has the kit. If that doesn't cure it move onto the next step. I just had Funhouse reboot when both flippers were used together. In my case it turned out ground resistance between Driver board and CPU.

#4 1 year ago

Seamlesswall He did not say the game was rebooting, so in all fairness dsquared_314 can you further describe this symptom?

Also, you can easily check the ripple voltage on the logic supply voltage with a DMM before replacing capacitors unnecessarily.

#5 1 year ago

You’re right it’s not game over mode.
I was just playing it and all displays go blank, playfield goes blank, flippers don’t work. Sound and backbox lights still work. Displays didn’t come back this time. Had to turn off and turn back on.

Also when I turn on, it does it’s test (I guess?) coils fire, lights cycle on and off, and the visor raises & lowers. Displays then goes blank. Displays come back on. Does start up test again. Displays go blank then come back on.

#6 1 year ago
Quoted from dsquared_314:

it does it’s test (I guess?) coils fire,

Hmmm blanking circuit? Searching for ball?

Quoted from wayout440:

He did not say the game was rebooting

You are correct! My bad.

#7 1 year ago

Yes, start the process of troubleshooting this by checking source power first.

*** Williams System 11 Power measurements and test points ***

Logic power
MPU IJ17 Pins 4,5,6 = +5.03 VDC @8.1 mV AC ripple
U26/U27 ROM Pin 1 = +4.91 VDC

Audio power
MPU IJ17 Pin 9 = -14.04 VDC (Unregulated)
MPU IJ17 Pin 8 = +12.02 VDC (Unregulated)
Audio board U11 (U17 on Sys11B) Pin 8 -13.9 VDC @250 mV AC ripple
Audio board U11 (U17 on Sys11B) Pin 4 +11.8 VDC @50 mV AC ripple

Controlled lamp power
PS 3J4 pins 5,6,7,8 (Sys11A) or backbox bridge 6BR1 (Sys11B)= +15VDC to +18VDC nominal.

General illumination power
PSU 3J8 (Sys11A) or Interconnect board output 2P7 (Sys11B) = 4.5 VAC to 6.3 VAC nominal

Display power
3J5 pin 3 (Sys11A) or 3J2 pin 3 (Sys11B) = +90 to +110VDC nominal
3J5 pin 4 (Sys11A) or 3J2 pin 1 (Sys11B) = -90 to -110VDC nominal

Flipper power
Game [email protected] supply board outputs= +65 to +75 VDC nominal

Solenoid power
PS 3J3 pins 6,7,8 (Sys11A) +32 to +35 VDC
Interconnect board F1/F3 (Sys11B) +41 VDC
Interconnect board F4 (Sys11B) +75VDC

Reference test games used:
Williams Pinbot - System 11A/D-8345-549 PS
Williams F-14 Tomcat - System 11A/Rottendog WDP-011A PS
Williams Taxi - System 11B/PinScore PJ-12246 Rev. B

#8 1 year ago

wayout440 thank you for detailed points to check.
Tomorrow, I have a quick draw to get working but I’ll report back when I get time to work on pinbot. It was funny though my wife likes pinbot, was playing tonight and thought she was going to beat my high score then it died. She wasn’t happy and I had to eat cereal for dinner.

#9 1 year ago

Ouch. You are definitely going to need to do some thorough quality checking after repairing.

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