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Position:IcFull.com » IC Electronic information » Category: 5

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5 cases of Induction Troubleshooting

In Electronic Infomation Category: 5 | on April 13,2011

Example 1 of a Taiwan and AD7730BRU datasheet and Australia Kangaroo UC18 machine does not heat, on screen "E1" characters.

Reset tone normal. Check for resistance thermometry kitchen surfaces (normal temperature is about 100 k) Variable is 165 k, resulting in check sent to CPU temperature and AD7730BRU price and the circuit surface temperature of the furnace and AD7730BRU suppliers and check the implementation of low voltage protection (equivalent to resistance thermometry open). After replacement with new parts, back to normal.

Example 2 A Taiwan and Australia Kangaroo UC18 machine, electricity, the issue of reset normal tone, on screen "E3" character, press all the keys had no response.

"E3" said the general meaning of the "Brown", so first check the over / under voltage protection circuit samples and found that the sampling resistor R24 ??(470 k) open. After replacing the resistor, and all back to normal. The cookers have a feature that is implemented over / under voltage protection action, it will also prohibit keying operation, so the button no reaction at all. Overhaul should be noted.

Example 3 Vantage HS20P a machine, the machine does not work. Check the power circuit

normal, low-voltage circuit 18 V, 5 V power supply, etc. are also normal, but did not issue a reset after power alert tone, the machine can not work. That failure in the CPU circuit.

Checked and found that all CPU pins flooded with grease and cockroach droppings, cleaning them after troubleshooting.

Example 4 a hemisphere 20B machine, reset the tone is normal, but can not boot.

The cookers with induction technique, and should therefore be focused on checking on / off sensitivity (because in normal circumstances, only the boot, the other keys to operate. So first check the on / off key is necessary.)

Remove and flip the control panel. Power, in the "On / Off" key sensor surface covered with small pieces of film, with your fingers to touch (Note that good insulation to prevent electrical shock) to test whether the induction of its action. The test, in the "On / Off" key sensor surface can still be covered by a thin layer on / off operation, but over the second floor is not valid, indicating the sensitivity worse. Cover with your fingers touch the surface of

operation signs, it can not sense out of the operation failure. Upon inspection, the on / off button circuit resistance sensor (no bit number, mark value 1 M) has been open damaged. Replacement of the resistance and what the appropriate fine-tuning "on / off" button sensitivity adjustment potentiometer (100 k), on / off back to normal operation.

Example 5 ViewSonic DZ-180X a whole does not work. 10 A AC

check the fuse has blown burst, indicating that there is a serious short circuit.

Measuring reactor power circuit of the rectifier bridge input resistance value of the exchange of 0 , measure the +, - end of normal, power management is also safe, that the exchange circuit short circuit. Disconnect the AC circuit in turn varistor, rectifier bridge pile and so on, testing the AC input circuit of the "zero" and "Fire" copper line resistance remains between 0 .

Further inspection, found connected to AC input switching power supply (for low-voltage circuitry) of the full-wave rectifier circuit, the circuit of two 1N4007 rectifiers have the breakdown, resulting in zero line and the line of fire and blown through fuse. In addition, the correct full-wave rectifier output to the concatenation of a 1N4007, but also has short-circuit breakdown.

Rectifier switching power supply after checking the circuit, without exception, but the filter capacitor (10 F/450 V) is no longer capacity. Analysis: the filter capacitor failure, resulting rectifier loss increases, reducing the breakdown voltage. The damaged components be replaced after troubleshooting.

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