From Newsgroup: rec.games.pinball
On 2021/03/17 9:32 a.m., Jason Doe wrote:
On Monday, December 10, 2012 at 6:00:01 PM UTC-7, shardian wrote:
A bit more information:
I can light any non-lit cpu controlled lamp by grounding the
"switched" side to the ground braid.
Using a DMM with red lead on the cpu lamp power rail and black lead on
ground braid, I get 3.5Vac, and 6.5Vdc. I read in another place that
these should be about equal.
Also, I grounded the lamp associated with the GI flasher relay and the
GI lit up correctly, so no problem with GI.
I know I'm mostly talking to myself at this point, but I'm still
hoping someone like Clay will come along and tell me that one little
thing I'm missing before I go through the effort of needlessly
changing a boatload of connectors.
I know I am resurrecting an ancient thread but having very similar issues and wondering if by chance you still are around and ever figured it out.
If you have lights that aren't turning on by the CPU, yet you can light
them at the tab of the light bulb to ground, then the problem is logic, wiring, or blown SCRs.
Try grounding the lead for any suspect lamp at the driver board - it
should light up. Then try at the drive leg of the SCR - the lead going
to the pin on the plug... If it lights then the problem is perhaps
connections to MPU or bad SCRs.
Was there any corrosion in your game? Then check the lamp control lines
pins at the MPU connector first.
John :-#)#
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