Observe the relay suck and release the sound. vtiservice manual download site
 vtiservice manual download site
Press the "POWER" key "secondary" boot, again lights flashing and relay suck and release the voice of the measurement of switching POWER supply output voltage fluctuates up and down. Measurement of microprocessor IC1213 6 feet high level voltage, judgment is fracture in the microprocessor protection circuit into protection state. Disconnect + B and output load circuit, dummy load after boot, measuring voltage + B returned to normal, and no longer appear to protect phenomenon, analysis is a + B load circuit circuit leakage problems. Focus detection line output circuit, no obvious fault; By disconnect + B road load circuit, the method of turning experiment was carried out, when the operation when the drive circuit of power supply and switch on is no longer protected. To test the line drive circuit Q590, between the collector and emitter of around 1 k Ω leakage resistance. After replacing Q590, troubleshooting.vtiservice manual download site