Through the failure phenomenon, illustrate the + 5 v power supply is normal, is usually the sign of a protective stop. Fault occurred in other than + 5 v power supply and the load circuit, should check mainly related to the microprocessor circuit. For this type of failure, should check each output voltage is normal. LHYservice manual download site
 LHYservice manual download site
Due to instantaneous protection cannot be measured, can determine the specific first, hold down the power switch is not put (should assure a shorter time, in case of failure to expand), rapid measuring various voltage in turn. Common is sent to the camera CCD + 16 v working voltage of abnormal. Wearing parts for QR1003, D1003 of this part, after the damage, make + 16 v voltage drops, QR1002 deadline; QR1001 base potential rise and conduction, to IC6001 (69) feet of voltage drop to 0 v, so IC6001 power close command, the power to immediately stop work, various voltage are disappearing, thus protecting the CCD component. So, the light flash is destroyed. LHYservice manual download site
 LHYservice manual download site
In addition, when + 16 v circuit peripheral component damage caused by heavy load, will also cause the loss of + 16 v, produce this kind of failure. + 16 v now need to disconnect the load test can be back to normal, which can judge the fault parts, and then find out the fault components.LHYservice manual download site