(Topic ID: 135864)

Thought it was an easy GI header repair... but kinda stumped

By JordanB

8 years ago



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  • 3 posts
  • 2 Pinsiders participating
  • Latest reply 8 years ago by JordanB
  • No one calls this topic a favorite

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#1 8 years ago

Hoping for some sage advice for a Jokerz GI problem I'm troubleshooting. Before I started out, the playfield GI and the backbox lighting was out.

I had some burnt connections on the interconnect board, so today I got around to replacing the pins and connectors. I redid J6 (labelled G.I. Input) and J9 (labelled G.I. L.PLFD)

After the repairs, the right side of the playfield lit up, and the backbox lit up, but the 1st strand of lamps was full brightness and the 2nd strand was dimmed. (image attached, same bulbs in both the top and bottom)

I checked the voltage on the bright series, and it was reading 6V. On the dim string, it was reading 3V.

The J6 connector appears to be the power in from the transformer -- 6V according to schematics. 4 wires, with 1+2 jumped, 3+4, 6+7, and 8+9.

The readings I'm getting from those wires are 1.5V on 6+7 and 8+9, and 3.9V on 1+2 and 3+4.

It's definitely possible that I'm testing the voltage wrong, or reading the schematic incorrectly, or both. At this point, I figure it can't hurt to ask for help.

backbox.jpgbackbox.jpg

GI.jpgGI.jpg

#2 8 years ago

check the connector for the GI coming off the transformer itself. They often burn. Make sure you test power in AC setting and use a test lead for each wire. Usually a bad header/pins or wires cause this. Also remove the fuses and meter them out to be sure they are good. Test the fuse clips too.

#3 8 years ago

Ahah, it was the connector to the relay board behind the backboard door. Here's things lit up and outfitted with LEDs:

LED1.jpgLED1.jpg

LED2.jpgLED2.jpg

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