K3 RS232 problem due to lightning strike

[Heinz-Josef Pick]

Last week we had a thunderstorm with a lightning strike into a neighbour house.
Some equipment connected to the telephone line is not working anymore and the K3 immediately went into TX mode after I switched it on. As I found out later this was related to the IC U1 (TI SN75C1406G4, costs < 1 ?) on the KIO3 main board. I replaced it carefully (you need some experience in soldering SMD devices!) and the RS232 interface is working fine again!

Voltage was -0,5 V at Pin 8 with the faulty IC and is now -8,5 V after repair.

Thanks to Atsu JE1TRV for advice in a previous email!

73

Joe

DK5WL
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