(Topic ID: 228730)

Bally PF Light Power Issue

By tomdrum

5 years ago



Topic Stats

  • 2 posts
  • 2 Pinsiders participating
  • Latest reply 5 years ago by Quench
  • No one calls this topic a favorite

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#1 5 years ago

Finishing up a solid state Bally Night Rider. Last issue was the pop bumper lights. I installed new bodies and lamp sockets. Two do not light as brightly as the 3rd. After testing, one has a solid 7.2VAC the other two just 3.2V. I followed the PF wiring braid to the source wires. The good one receives voltage from the top of the PF via white wires and everything on that circuit is over 7V. The 2nd is the featured light bus which receives power from 2 blue wires from near the left slingshot. On this game it looks like the featured light bus also feeds some GI lights. These only show 3.2V, and all the feature lights on that circuit show the same. Looked at the rectifier board and the TP4 shows 7.2V. However testing the J1 pin 7 (feature light bus) shows only the 3.2V, pin 8 is 7.2V (GI light bus). Ideas anyone?

#2 5 years ago

You had this same problem with your Eight Ball machine we recently worked on.
The rectifier board has some bridge rectifiers that convert AC coming out of the transformer into DC for the game.
Bridge rectifiers are made up of 4 internal diodes. When one of those internal diodes goes open circuit, the bridge rectifier can only convert half of the AC to DC and this results in the output from the bridge being half voltage.

Bridge rectifier BR1 on the rectifier board is for the feature lamp voltage supply and one of its internal diodes has become faulty - hence why it's outputting only 3.2V now.

You need to replace BR1 - note the originals are no longer available so unless you have a spare rectifier board you can pull one from, you'll need to mock up a beefier bridge on top of the PCB with a heatsink like everyone does now. The original bridges are hard to remove if you don't have the right soldering equipment.

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