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Illustrated Supor Cooker Troubleshooting (d)

In Electronic Infomation Category: I | on April 21,2011

5. Supor C19S01 cooker indicator does not light, failure of key functions, induction cooker does not heat

Examination and P87C54UBAA datasheet and analysis: According to the repair experience, the main reason for this kind of fault in the keyboard control circuit. Therefore, the repair should focus on examination of the circuit control board, in fact, printed circuit assembly and P87C54UBAA price and physical components shown in Figure 7 (see next page).

Circuit in the control panel, the core of the device is mainly U1 (51E99KKSN74HC164N) and P87C54UBAA suppliers and E101 (HX0430lBHB) and Q1 ~ Q5 and so on.

Where U1 is the shift register is mainly used for keyboard scanning and light control, its normal operating voltage and pin resistance shown in Table 3.

E101 as a digital display tube, the pin of the normal operating voltage and resistance values shown in Table 4.

Table 3 U1 (51E99KK SN74HC164N) pin functions and voltages


Table 4 E101 (HX04301BHB) pin functions and voltages


After inspection, R21 (10 k) pull open. Be replaced, the fault has been ruled out.

Summary: In the control panel circuit, R21 (10 k) main board circuit IC201 (HT4 * 7) 15-pin microcontrollers provide the bias voltage. Just plug in the power, IC201 15 feet through the R21 (10 k) of about 4.2 V high; when you press the K8 key (on / off) when triggered by the U1 13 feet, IC201 15 feet into 0.55 V low; since then K2 and other function keys, IC201 15 feet and then rise to about 2.7 V voltage, while U1 13 feet from the 1.9 V 2.7 V high to low, induction into the heating state.

In addition, when the R21 resistor open circuit, IC20l 15 feet will not work properly, the appliance can not enter standby mode after power on, then the failure of the other function keys, induction cooker does not heat.


Figure 7 Supor C19S01 cooker panel assembly and printed circuit components in-kind

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