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Mesa 7i95 INIT and DONE red lights at power on, not pinging

  • tovarna
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28 Mar 2022 08:59 #238512 by tovarna
Mesa 7i95 INIT and DONE red lights at power on, not pinging was created by tovarna
Hi, our Mesa 7i95 was functioning fine until last friday. We were testing out two stepper motors in a plasma cutter and suddenly stopped working. We think we could have accidentally touched the JTAG pins while powered on, but I don't know if this would've caused much trouble. It shows the INIT and DONE LEDs (CR19 and CR20) red, we tried to ping the board in 10.10.10.10 and 192.168.1.121 to try and flash it and it didn't ping. LinuxCNC shows the same error if the board is or not connected (hm2_eth: rtapi_app_main: Resource temporatily unavailable (-11)).
Any ideas on why is this happening? Thanks.

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28 Mar 2022 10:18 #238517 by tommylight
Replied by tommylight on topic Mesa 7i95 INIT and DONE red lights at power on, not pinging
Moved to "driver boards".

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28 Mar 2022 14:32 #238527 by PCW
Replied by PCW on topic Mesa 7i95 INIT and DONE red lights at power on, not pinging
I would first check the 5V supply, Low 5V can prevent
the 7I95 from starting.

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28 Mar 2022 16:26 - 28 Mar 2022 16:30 #238531 by BigJohnT
Replied by BigJohnT on topic Mesa 7i95 INIT and DONE red lights at power on, not pinging
When I plug in my 7i95 after booting up the only LED that's on is CR21 and it's yellow.

When I run a 7i95 configuration the 4 user LED CR1, CR2, CR3, CR4 are green.

When I shut down the configuration CR19 is red, CR20 is yellow, CR1, CR2, CR3 are off and CR4 is green.

JT
Last edit: 28 Mar 2022 16:30 by BigJohnT. Reason: add more info

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29 Mar 2022 06:54 #238571 by tovarna
Replied by tovarna on topic Mesa 7i95 INIT and DONE red lights at power on, not pinging
Hello! Thank you guys for your replys.

I've checked and the voltage once the power supply is connected to the board is 3,3V aprox. However, when measured without the board connected, the PSU gives 5,12V.

Maybe some board components are burnt?

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29 Mar 2022 07:25 #238573 by tovarna
Replied by tovarna on topic Mesa 7i95 INIT and DONE red lights at power on, not pinging
Checked the board and the zenner diode at the supply input is short-circuited. I'm gonna replace it and see if it solves the problem. Thanks!

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29 Mar 2022 11:25 #238593 by tommylight
Replied by tommylight on topic Mesa 7i95 INIT and DONE red lights at power on, not pinging
It means the polarity of the power supply was reversed.

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