What is the old burning power tube in the induction cooker?
Because the switch voltage C up to 300V, if C G 300V high voltage short circuit, through G, G input circuit element damage signal, switch pin 14 output drive signal of integrated block LM339 tube driving signal, amplified by the triode, and then by a zener diode. The IGBT switch work in the state. Measuring two driving tubes and stabilizing tubes and resistors with a multimeter, it is found that the replacement of damaged components can eliminate the faults. Especially after IGBT, in order to test the whole work is normal, to avoid damage to expensive IGBT, you can access the 100W-200W connection ring position bulb, the transformer secondary output diode rectifier after the end of the resistance of 1K 5V to simulate the receiving end, pan state, choose different stalls or temperature see the brightness of the bulb to determine whether changes in the work is normal, if the bulb lit that IGBT is in the normal state, indicating that there are other faults, needs careful maintenance.
The electromagnetic oven burning old IGBT power tube, the first is to repair fault IGBT power tube and the change of insurance, but do not rush to power test machine, or they may also burn IGBT power tube, replacing the two element element, some electromagnetic oven can resume normal work, and some power, indicating the lamp during operation can shine, but the machine drops will be issued, function does not work, later will automatically shut down.
1 repair IGBT tube electromagnetic oven fear trick; also remember to replace the IGBT drive tube change together (whether it is good or bad; many people have bad measurement did not change; the price is not too long to burn IGBT; two audions up to 1 yuan; a IGBT to turn over ten) also check the 0.27UF or 0.3UF, 5UF capacitor; everything is ready. 2 in the exchange of 220V, a series of 60-100W lighting, and pan, power on: (1). If the red bulb (suitable for inserting 220V after standby indicator), open the electromagnetic oven power a light bulb, a secret flash (and plug in the 220V after the standby light does not open), electromagnetic oven power, a light bulb that is dark is a dark light power resume; that the electromagnetic oven has the basic OK. 2. if the bulb is bright, it indicates that the IGBT pipe is fully connected. At this point, if the light bulb is removed, the IGBT tube must be burned! It should be the main driver of resonant capacitor voltage rectifier circuit. (3) if the bulb is dark red, open the electromagnetic oven power, lighting brightness unchanged. It should be the main control panel power supply side power circuit of microcomputer. (4) if the bulb is dark red, open the electromagnetic oven power, a light bulb of a secretly flashing, but the pot up light bulb is very bright; to lift the pan fried IGBT, check the CPU disk drive line.
