Observe the standby indicator light, press the standby button on the remote control can not be switched on.3qqservice manual download site

     After the overhaul inspection in accordance with the method of Example 1 was not abnormal, indicating no AC voltage automatic switching circuit malfunction. Test for Power thick blocks (STR-M68338F04), is invalid. The key element to check the load of the brightest are no exception. To determine whether the fault is not completely pressure caused by the double rectifier circuit protection, detection D820, D821, Q803 optocoupler D819 and other components were normal. Detection in road divider resistors R816, R817 normal, measured R818 resistance significantly greater than the nominal value 2.2kn, remove it found to have been broken. After replacing a 2.2kΩ/0.5w resistance, troubleshooting.3qqservice manual download site
 3qqservice manual download site

     Because R818 circuit, making a substantial negative terminal voltage rises D820, D820, D821 breakdown conduction, conduction optocoupler D819, Q852 cutoff relay RL801 contacts release, to keep the machine in standby protected.3qqservice manual download site