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My Tester has failed messages in some Tests at calibration, after repeating some Times, the Tests are ok, I think there are contact problems with relays.
![Electronic Circuitry Diagnosis And Fault Finding! [Repair]](http://i.ytimg.com/vi/LC7OjuYAOQE/mqdefault.jpg)
![Electronic Circuitry Diagnosis And Fault Finding! [Repair]](/img/tr.png)
My Tester has failed messages in some Tests at calibration, after repeating some Times, the Tests are ok, I think there are contact problems with relays.