(Topic ID: 194825)

SAM Drop Target Optos Not Registering

By Manimal

6 years ago



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  • 2 posts
  • 1 Pinsider participating
  • Latest reply 6 years ago by Manimal
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#1 6 years ago

Have a Stern FG that is not registering switches correctly and the 4 bank and single bank drops. The original 4-bank would only register on switch 2. Replaced the Opto board with a known working one and none of the switches will register, however the board does have the correct voltage, and the optos are working correctly (tested output). I tested wire continuity from the switch to the SAM board and all circuits tested fine, so I am sure the new optos boards and wiring are fine. All other switches work fine as well. Board connectors were tested and all pins re-flowed just to be sure. Anyone have a suggestion of where else to look? I do believe from testing that the original 4 opto board was probably bad as I could not get any reading on 1,3,4 optos like I can on the replacement....is there any history of these optos going out and messing up the main board? I appreciate the help.

#2 6 years ago

Solution: CPU board and Transistors were fine. As it turns out the "known good opto board" was defective. New optos and she is a s good as new.

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