CNI power supply voltages

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

 

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.

 

I thought that but the resistors in the gnd pin and the feedback from output via resistor means voltage is being changed...

 

For those of you interested. I purchased a new Lantronics board and hey presto. CNI is working again.

it was hard to find one with the LAN port and LED not installed but found this in canada

https://www.ebay.com.au/itm/CO-E1-00AAR-LANTRONIX-SNMP-interface-module/112335799529

 

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 !