Analysis and maintenance of auxiliary power supply is normal, the main power to stop vibration free output. The power control circuit is shown in figure.f82service manual download site
Press the power switch, main and auxiliary power supply are connected, the auxiliary power to work, the output +5V voltage for remote control system. The +5 voltage by the supply side switch makes Q1106, Q1105 conduction, CPU (IC1101) 10 pin key scanning output signal is applied to the 17 foot key scanning input, the CPU identification, control the output high level at the 32 foot power, Q1113, Q802, Q803, D826 cutoff, then Q806 cutoff, Q801 entered the state of oscillation the main power supply.f82service manual download site
Based on the above analysis, first check the IC11O1 32 pin is in the high level output, if not for the CPU power supply, reset, key scan and auxiliary power circuit fault. As for the high level, check Q1113, Q802, D826, Q803, Q806 for short circuit fault.f82service manual download site
After IC1101 32 feet high in the on state, off state to a low level, a change from normal. Q802 C, e, has the short circuit breakdown, leading to the switch tube Q801 base shorted to ground, the main power cannot startup. After replacement of the Q802, troubleshooting.f82service manual download site