(Topic ID: 286497)

WMS System 6 startup issue

By EMDude

1 year ago

Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 1 year ago by chad
  • No one calls this topic a favorite


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61E7826D-B262-4CEB-B3B6-185DAD60B7C4 (resized).jpeg

#1 1 year ago


Recapped Power and Sound boards (sound works now), installed new MPU to Driver board connector, reflowed all other connectors, installed new AA batteries (battery holder/MPU free of corrosion), checked/replaced all fuses.

On power up, the 2 MPU LEDs flash twice then go out. GI lights up okay, but game goes into ‘audits’ mode. If I open coin door and off/on a few times I get sounds and displays flash and sometimes a solenoid or two fire, but displays either go on, then off after a few seconds or stay on but game will not register credits.

I swapped out driver board with a known working unit from my FLASH but symptoms are the same.

Any and all suggestions greatly appreciated!

61E7826D-B262-4CEB-B3B6-185DAD60B7C4 (resized).jpeg

#2 1 year ago

Diode 17 on MPU board 1N4148 could be bad. The cmos chip 5101 itself could be flaky. Just to make sure you have 3 good AA batteries installed.

#3 1 year ago

Possibly an intermittent coin door switch, the large white rectangle one.

Have you tried turning the game on/off quickly twice via the under cab switch?

Also assuming with all the work you've done, you have checked for any dry solder joints? Or even reflowed headers anyway?

#4 1 year ago
Quoted from chad:

Diode 17 on MPU board 1N4148 could be bad. The cmos chip 5101 itself could be flaky.

Thanks! Your suggestion is very specific, have you had a similar issue?

#5 1 year ago

This sounds like a 40 pin interconnect issue to me. Since you just replaced it I would double check your solder work, but I would also make sure when putting the two boards together that you give them a firm push to make sure the interconnect is good. From the picture it looks like you used the shorter pins for the interconnect, I think that's all that Big Daddy offers now, but I prefer to get the longer ones to make sure the connection is good.

Also make sure that your screws on the driver board aren't putting too much pressure in the middle and making the interconnect actively worse.

#6 1 year ago
Quoted from EMDude:

Thanks! Your suggestion is very specific, have you had a similar issue?

Only a few times with the diode and many with bad/flaky cmos 5101

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