Unplug when checking line boot, after the green light, normally on again, no pressure. mUMservice manual download site
 mUMservice manual download site
From the fault signal may have a problem, the key check, line signal input all the way, because the machine has been changed in ignition coil, CPU, EEPROM, line oscillation chips, key check signals, all the way out after big, problems may also be in the CPU peripheral circuit, measuring the CPU power supply only 3.6 V, and the lowest CPU power 4.8 V, check the power supply filter capacitance is bad, change after the voltage is normal, because of much related with the signal, so the key to check line synchronization, field synchronization, clock, oscillation signal 4 original road, found out the CPU clock signal along the zener diodes soft breakdown, normal voltage value 4 V, the fault machine 1 V, to be removed after the normal measurement.mUMservice manual download site