CNC Controller IC Help

[Audacity]

My company received a new CNC controller system for our router. It came with a small set of boards (one power, one controller, one interpolator). During intial setup, one of the guys putting it together thought he knew what he was doing and in fact didn't. The IC on the interpolation board began smoking and popped a hole in the top... so we need a new one!

I can't make out the entire part number on the top of the IC, which is a problem for me, but I need someone to possibly help knowing the application.

What I do know:
Texas Instruments SN74LS_____ (the burn through was right there)
Also, there is an additional set of characters: SCHXRXK
This was damaged by the blow-out, but I'm fairly certain that is what it has printed.


Can anyone help me determine which of the SN74LS series IC's this is? We are in desperate need of getting the machine up and running!

Thanks ahead of time!

 

[dV8r]

Doing this you are likely to be chasing bad components for a month, replace the whole board. Or send it in for repair.

 

[Skogsgurra]

Agree. There are probably a lot more components that are dead on that board. Perhaps in the whole system. It depends a lot on what actually happened - wrong supply voltage? wrong polarity? perhaps even a mistake regarding AC and DC?

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[Audacity]

Well, the worker who put it together hooked the output from the card directly to the stepper motors. When we would power it on, the IC would smoke immediately, but the rest of the circuitry shows fin function (including the 3 LED's on it for fault, function, and clock). Due to our lack of patience with our CNC supplier, we really just want to get the IC to see if the system works and if it doesn't move on to a new system entirely. We really don't want to work with getting another board.

Any chance anyone could help?

Here is the schematic of the board with the pinouts to the 3 axis driver system...

http://xs216.xs.to/xs216/07261/BufferCard.PNG

 

[Skogsgurra]

That is not a schematic of the board, just how to connect external wires. So it is not possible to find out what your IC is. But, if you have a supplier, he should be able to tell you what IC that is.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[jraef]

I hate it when equipment suppliers make it difficult to get service on their own equipment... oh wait, I resemble that remark!

I agree with otyhers that trying to replace just the IC is probably pointless, it was likely the LAST component to go in a cascade of failures.

Try looking into a 3rd party repair company, such as Electrical South, who specializes in repairing industrial equipment. They keep archives of schematics on anything they have ever worked on and often contract with manufacturers to do their repairs now that cutbacks have become the norm.

http://www.elsouth.com/

 

[itsmoked]

74LS???

Sadly the ??? is about 100 different values.
Too bad the "74LS" didn't fry instead.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com