(Topic ID: 304758)

Where is R145 on System 11 Schematic? Fire!

By smileymatthew

6 days ago



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  • 8 posts
  • 5 Pinsiders participating
  • Latest reply 6 days ago by smileymatthew
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system11_r145.jpg

#1 6 days ago

So plugged in a Diner that had been sitting for years with a rebuilt CPU from Coin Op Couldron... After about 15 seconds being on R145 Caught fire inside on the board. Of course, flipped the game off. Everything else seemed "Normal" beyond that.

Going through the schematics, I cannot find R145 anywhere? I found 146, but not 145. Anyone have any idea where this might be on the schematics. Trying to track down what's going on!

Many thanks!

- Matt

#2 6 days ago

In the BoM, it is listed as 1K 1/4W.
Where is it physically located on the board?

Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

#3 6 days ago

Page 2 of the MPU schematics, upper left corner.

Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

F92D077E-4A1B-4D30-AE43-882D21C1F7FB (resized).png
#4 6 days ago
system11_r145.jpg
#5 6 days ago

Thank you guys. I looked for that for 15 minutes. Now the question becomes, WHY did it smoke? As mentioned, this game sat for about 10 years- totally torn apart and put back together. Rebuilt MPU, new Aux board etc.

Obviously something in the switch matrix... Oddly, it looks like the transistor (q45 on the board) was fine but I'll have to inspect closer. As you can see, it's BLACK from the fire on the board. Nothing else looks damaged around it. Fluke maybe? Seems odd.

20211125_011553 (resized).jpg
#6 6 days ago

R144 doesn’t look to be in great shape either.

#7 6 days ago

For a 1k resistor burning out, I think there must be a short between solenoid voltage and switch column #1. One possible place is the interconnect board, where opto U1 is used to check A/C relay operation.

#8 6 days ago

Good point. I did not pull the Interconnect board, but every other board I did. I'll check it out.

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