Theatre of Magic - Dot Matrix troubleshooting?

Snarly

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Hi,
Not sure where to post thsi - my Theatre of Magic has been a solid machine for a while.

The dot matrix diplay has started to not work and then works....

Any ideas for troubleshooting? I just went through the manual and only see a reference to fuses F601 and F602 needing 3/8A 250v FB.

Thanks,
Chris
 
Hi,
Not sure where to post thsi - my Theatre of Magic has been a solid machine for a while.

The dot matrix diplay has started to not work and then works....

Any ideas for troubleshooting? I just went through the manual and only see a reference to fuses F601 and F602 needing 3/8A 250v FB.

Thanks,
Chris

The high voltage regulators on the DMD controller are the most common culprit.
 
Could be the cable, but usually when the display goes in and out like that, you're about to lose one of the sand resistors in the hv section. Might be a cold solder joint in the hv section as that area gets hot on the dmdpower board. Slap a meter on the three sand resistors and see if any are out of spec.

Mike
 
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