(Topic ID: 146889)

TMNT DMD stopped working

By siggsagg

8 years ago


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  • 15 posts
  • 4 Pinsiders participating
  • Latest reply 8 years ago by siggsagg
  • Topic is favorited by 2 Pinsiders

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dmdpanelpower.png
dot_matrix.png
dot_matrix_on_power.png
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#4 8 years ago
Quoted from zaza:

there must be a 12V difference between the last 2 voltages (-108 & -120 )

What he said. It won't work without that 12v. That's used as a power supply for a bunch of 12v logic (yuck) that controls the HV row decoder.

#7 8 years ago
Quoted from PinballManiac40:

-110.1V (-108)
-110.2V (-120)

Looks like you aren't getting the 12V? These two voltages must be 12V or so apart...

#10 8 years ago
Quoted from siggsagg:

Checked in the manual on ipdb, but I'm puzzled by that aswell.

That second image looks wrong - I'd be pretty certain that's a typo. This image is taken from Dale's schematics, other manufacturers will be the same:

dmdpanelpower.pngdmdpanelpower.png

Edit - just to clarify a couple of points - it doesn't matter much whether the two negative voltages are -120 and -108, or -110 and -98. I believe some machines run the negative rails at a lower voltage, to extend the life of the panels. The main thing is that they're 12V apart, whatever they are. Also, the image is the pinout of the DMD panel power connector, not the PSU connector in the machine.

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