Power for the GI Backbox lights come in through J6 on the interconnect board and it goes out J7. If you have voltage coming in at J6 and you have voltage at J7, then you might have a broken wire. If you don't have voltage at J7, then the problem is either at the J6 connector (very common), or somewhere between J6 & J7 (fuses are on one side, straight traces to the other).

Best regards,

Tom

Attached is the schematic of the GI Circuit on the Interconnect board. My understanding is as follows for the Green & Green/White Wires.

Power comes in through yellow wires into J6, pin 3. Goes to back box out J7, pin 9 (green wire). Through the lights (to illuminate them) back in J7, Pin 7 (green/white wire), through the fuse at F3, back out to the transformer through J6, pin 8. As this is A/C current, the Yellow and Yellow & White wires work in pairs. The Green and Green & White also work in pairs. The attached schematic shows what I am trying to explain.

Best regards,

Tom
IMG_3865.JPG

MPU does not control the GI Lights. How are you testing for voltage. Are you testing to ground, or the Yellow or Yellow/White at the J6 Connector? Remember, the Yellow & Yellow/White, the Green & Green/White wires work in pairs. Test the wires in pairs for voltage.

Best regards,

Tom

Check for wire breaks at the first socket on the backbox lightboard.

The tests I would perform

Issue: Green & White/Green GI string does not light

Turn off Game & Unplug Connector at J6 on the interconnect board

Keep Game Off Test for continuity between J6-3 & J7-9. If no continuity, then use the schematic to locate the break.

Keep Game Off Test for continuity between J6-8 & J7-7. If no continuity, then use the schematic to locate the break

Keep Game Off Test Green & White/Green string of lights for continuity

If you still have not found your break, reconnect J6 and very, very carefully with the machine on:

Test: DMM Test Connector J6-3 (one probe) & J6-8 (other probe), at connector plugged into interconnect board. Per schematic above, you should have 5.9v ac, If no, you do not have power from the transformer. If there is power, then maybe the relay on the back of the insert panel is giving you problems (I haven't seen that before, but who knows). I would be looking for broken wires/bad connections.

Best regards,

Tom

I would start at fuses, and from there look for a broken wire. Given all lights are out, I would be looking primarily for a common ground wire to be broken.

GI lighting can be such a pia we had a string out in the backbox of sorcerer and I got bored one day and broke the meter out and started checking and low and behold it was a fuse that was intact looking at it but no good