(Topic ID: 330000)

15B-6797 6.3 vac winding too high

By jscaptura

2 days ago

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  • 3 posts
  • 3 Pinsiders participating
  • Latest reply 2 days ago by Grizlyrig
  • Topic is favorited by 1 Pinsider


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#1 2 days ago

I've been having an issue with LEDs running hot in the GI in my Gorgar. Voltage at the GI sockets was 8.1 volts, so I added a bridge rectifier inline to bring it down to close to 7 volts, but I'm still seeing issues with the LED strips that I added overheating and failing. All other voltages from the transformer are within reason, so I'm thinking I've either got a shorted turn or two in the GI windings, or a transformer that was made at 4:55pm on a Friday at the factory. That may explain why there were bare spots in the backglass in front of the GI lamps...

Thinking of going one of 3 routes here and looking for some feedback:

1) installing a dedicated 6.3v filament transformer for the GI
2) adding another bridge rectifier inline with the GI to drop it another volt
3) seek out another 15B-6797 to replace the one in my game.

I should point out that when I bought the game, the GI was disconnected from the transformer. Didn't think much about it until I converted to LED and started having issues.

#2 2 days ago

Partially shorted GI winding would cause reduced voltage. Short in primary winding would make secondary voltages higher, but since your other voltages are normal, that is very improbable. It might be just that the LED's take less current than incandescent lamps, so voltage is a bit higher than under nominal load.

Another bridge could help, or two or three 6 amp diodes in series.

#3 2 days ago

Here is an idea for you to use.

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