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Illustrated Supor Cooker Troubleshooting (c)

In Electronic Infomation Category: I | on April 23,2011

3. Supor C19S01 cooker indicator light, not heat

Examination and MC34017 datasheet and analysis: Based on experience in maintenance of the appliance is lit, it indicates high and MC34017 price and low voltage circuit and MC34017 suppliers and microcontroller circuit normal. It should be noted then check IC202 (LM339N) and its peripheral components, the circuit shown in Figure 1.

Upon inspection, found to IC202 (LM339N) 13 pin output voltage is OV, power failure is detected on the ground, the reverse resistance of only 0.01 k, normal, as shown in Table 2. Therefore, to determine IC202 damaged. Be directly replaced, the fault is ruled out.

Table 2 IC202 (LM339N) pin functions and voltages


Summary: In Figure 1, IC202 (LM339N) 13 foot main signal for output overvoltage protection, and municipal networks in the circuit when the voltage is normal, V201 full-bridge rectifier output voltage through R27 (820 k), R2 * 70 k), RJ9 (10 k) partial pressure of sampling after the added to IC202 pin, so that D of about 1.59 V comparator inverting input voltage, at the same time, +5 V power supply through RJ8, RJ7 11 feet to the IC202 input phase voltage is about 3.01 V, which is in comparison to D-state, IC201 (HT4 * 7) 17 feet was high, feet pulse width modulated output; when the network voltage increases as markets and other factors that IC202 feet voltage increases, and more than threshold value, D comparator deadline, IC201 17 pin was low, single chip implementation of standby protection. Therefore, when IC202 13 pin showing the internal circuit to ground short circuit fault, the appliance is in standby to protect the state. At this point, IC201 pin interrupt signal output of about 0.13 V, the IC202 feet down to 0.83 V the following potential, drive circuit and IGBT control to stop working.

4. Supor C19S01 cooker indicator light, not heat

Examination and analysis: Based on experience in repair, first check IC202 (LM339N) of the pin-line is, the reverse resistance, no abnormal (the normal Table 2). Further examination IGBT gate driver control circuit (the schematic diagram shown in Figure 3) found that Q6 (S8550) c, e among the most positive and negative resistance is zero, so that Q6 is damaged breakdown . Try to replace it, the fault is removed, as shown in Figure 6.


Figure 6 IGBT gate drive circuit components, pipe physical assembly diagram

Summary: In the cooker indicator light, heating troubleshooting, but not in power generally do not check the voltage first, but should first of all a "resistance measurement" Check some of the larger resistance of the power components and pulse width modulated drive circuit and so on, until no obvious short-circuit components, the only power checked some of the relevant parts of the operating voltage value.

(Continued)

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