[Elecraft] Elcraft K2 6216, Problem with Voltage Sensor on Control Board

[Dianne & Richard Gething]

Hello All

Thanks to all who assisted with my previous problem with the IC socket. I changed it OK. 

I am now looking for help with another fault. 

It appeared as I was doing the Alignment & Test Part 1 on the Control & Front Panel boards of my K2. The fault occurred after I tested the Voltmeter Probe Assembly and I think I may have damaged one of the IC's.

When I first switched the unit on to test it the Voltmeter and Current display were working fine. However after I built & tested the Voltmeter Probe, the Voltmeter display read 23.0, and no matter what voltage I applied, internally or through the probe, the reading did not change. The current readings were fine and I was able to complete the all the tests in Part 1. 

I have carried out resistance tests, and all the components and the circuit board look fine, so I feel that the Voltage Sensor IC U3 may be the problem. I am hoping the fault would not have got to the microprocessor U6, as all else appears OK.

Before I remove U3 and request a replacement, has any one any thoughts?

Thanks again.

Regards  Richard  VK3AGQ