Mesa 7i97T unresponsive analog outputs

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1 year 6 months ago #326394 by matasbuk
Hello, trying to setup the 7i97T, but output 0 always seems to be at 4.55v no matter what, its enough to power up the board and not connect it to anything. Output 3 is the same. other outputs stay at 0 and do not change through halshow then I enter value manually. Even though they are enabled and scale set. My .ini and .hal files are attached.

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1 year 6 months ago #326398 by PCW
If any analog output is not close to 0V at power up, (and no output mis-connections)
there is a hardware problem (perhaps a damaged op-amp) on the card and it needs repair.

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1 year 6 months ago #326401 by matasbuk
Tried with everything except power disconnected, tried to connect the drive, but the drive would proper forward with no command with stable speed with LinuxCNC off. Channel 3 was never even attempted to connect. Other channels are unresponsive.

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1 year 6 months ago #326407 by PCW
If you have nothing connected to the 7I97T but 5V power and any analog
output is not  close to 0V, the analog output circuitry has been damaged somehow.

This may occur if an output was inadvertently shorted to say +24V or
connected before a common ground was established between the drive and
the 7I97T.

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