(Topic ID: 309324)

System 11a Power issues?

By dsquared_314

2 years ago



Topic Stats

  • 9 posts
  • 3 Pinsiders participating
  • Latest reply 2 years ago by wayout440
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#2 2 years 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...

#4 2 years 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.

#7 2 years 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 specific@flipper 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

NOTES
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

#9 2 years ago

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

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