When this machine cannot boot or shutdown automatically, measure for microprocessor IC1101 7 feet high level, to judge the microprocessor into protection state.
 
Taken individually disconnected 7 feet external detection circuit, the method of individually disconnected D510, D519, D509, D805, D511, D842, D402 and D843, when disconnect D510 boot no longer protection, that is the core Q502 caused by loss of pressure, under-voltage protection circuit protection; Restore D510, again take individually disconnected Q502 base detection circuit, the method of individually disconnected D525, D510, D507, D513, D511, D508, D822, when disconnect D510 boot no longer protection, determine the 12 v rectifier filter or malfunction of the load circuit detection C860 14 v at the ends of the voltage is normal, but there is no 12 v voltage output, testing between R821, welding side open, 12 v, the pressure loss caused by the microprocessor protection. Will be resumed R821 welding is good, protective circuit after the commissioning, troubleshooting.