CNI power supply voltages

Discussion in 'C-Bus Wired Hardware' started by Charlie Crackle, Oct 9, 2017.

  1. Charlie Crackle

    Charlie Crackle

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    I have a CNI which has stopped working. (1st gen DIN rail with black screw terminals)

    both network and cbus lights are orange. can be seen via tool kit on cbus

    can not ping network address. a wireshark trace shows it ARP for the gateway and that is it.

    Cbus and Lantronix device finders can not find it and a static ARP entry does not work either.

    I have taken apart to check power supply. the power supply input is 12v DC and the out put voltages on 1 and 2 are 6.48V and 10.85v respectively ? are these correct ??

    Charles
     

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    Charlie Crackle, Oct 9, 2017
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  2. Charlie Crackle

    tsman

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    I'd expect the 6.48V pin to be 5V due to that 7805 you see next to it. It may have damaged the Lantronix CoBox module which is why the network side appears to be dead.
     
    tsman, Oct 9, 2017
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  3. Charlie Crackle

    Charlie Crackle

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    I thought that but the resistors in the gnd pin and the feedback from output via resistor means voltage is being changed...
     
    Charlie Crackle, Oct 9, 2017
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  4. Charlie Crackle

    NickD Moderator

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    Both of those voltages look normal.

    Nick
     
    NickD, Oct 10, 2017
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  5. Charlie Crackle

    Charlie Crackle

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    Charlie Crackle, Nov 2, 2017
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    DarylMc and rikaussie like this.
  6. Charlie Crackle

    Charlie Crackle

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    I have had 2 more of these older CNI (black screws) fail for different customers. Looks like the Lantronix boards must have a limited life. Good job the same link on ebay still works so I can repair them !
     
    Charlie Crackle, Feb 15, 2020
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    Dan likes this.
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