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(Topic ID: 189067)

LM4094??? - Champ Pub Serial 24 driver board

By creech927

3 years ago

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  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 3 years ago by creech927
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TCP 24drv U3.jpg

#1 3 years ago

Hi Pinside, Tech question:

I've got a CP with the LED life meter lights not working. I've traced it to 4 very obviously cooked resistors on the Serial 24 Driver board. (R4, R9, R16 and R23). These are fed by an LM4094, an IC I can't seem to track down or find a cross reference for.

It's my guess that if I replace the IC (LM4094) and the obviously cooked Resistors, and a couple of diodes and transistors down the stream, I should be able to get this thing working again.

Does anyone know anything about an LM4094? I can't find anything on it.



#2 3 years ago

It's a shift register:

TCP 24drv U3.jpg

#3 3 years ago

"LM" is just a particular manufacturers code prefix (National Semiconductor) - HEF4094, CD4094 are other identical parts from different manufacturers.

There are many others - the clue is to look for a "4094".

#4 3 years ago

Thanks for the clue!

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