The fault lies in computer-controlled power circuit AC220V power output by two step-down transformer T101 (6V × 2 and 16V) AC low, after a full-wave rectifier circuit filter was working as a display 6V power supply; Another group was after the half-wave rectified and filtered. regulator circuit through two series were too 5V (IC01 as microprocessors and other control circuitry power) and 12V voltage (as a relay RY1, RY2, RY3 its drive circuit working power).hgVservice manual download site

Check AC220V, FU, S4 were normal, and no secondary measure T101 6V, 16V AC voltage. Power, measure the primary circuit T101 found after replacing the T101, power on, and put into a microwave oven showed normal work, troubleshooting.hgVservice manual download site