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I changed the output circuit stk 412-150 and it worked correctly but after 15 days I return with the fault that turns on but does not switch the relay and remove the STK and still does not switch the relay
that is not stk problem
Strange. If you have 0.7V on the basis of Q644 and 0.6V on the basis of Q647, the collector of Q644 goes zero by saturation causing the relay to close.
Check the transistors