Electromagnetic oven circuit board simple maintenance method
The king said, che 2019-12-02 20:56
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Induction cooker maintenance we first want to understand the induction cooker, understand the heating principle of the induction cooker after the better maintenance.

Electromagnetic oven cauldron divided current cauldron (most of the domestic machine commonly used) and high voltage pulse cauldron (shang peng tang commonly used) two kinds. Current checker is through the current transformer (is a board like a small transformer east, its primary very thick a turn) to detect the size of the working current, the current reaches a certain value as a pot. Here to give you a little experience: fixed in the motherboard, especially after the change of IGBT, in order to detect the machine work is normal, to avoid damage to expensive IGBT again, you can access on the coil position 100 w – 200 w bulb, to pass through the diode rectifier transformer secondary output terminal through a resistance of 1 k received after 5 v, to simulate a pot state, choose a different gear or temperature to see if the light bulb brightness changes to determine whether the machine work is normal, if the bulb is normally on prove Chang Tong IGBT, need careful maintenance.

Pressure pulse cauldron is to determine whether IGBT is in underdamped (no load) state by measuring the number of c-pole pulses. If more than 9 are considered underdamped (no pot), and if less than 5 are considered as having POTS. Some models use both.

A, repair induction cooker is afraid of IGBT tube burning trick

Replace IGBT and remember to replace the drive tube together (good or bad; A lot of people measure is not broken is not changed; The price is to burn IGBT again soon; Two transistors at most 1 yuan; One IGBT is about to be doubled by a dozen.) check the 0.2uf0.3uf5uf capacitor; Everything is ready.

On the ac 220V, connect a 60-100w bulb in series, add a pot, and switch on the power:

(1). If the bulb is dark red (applicable to the standby indicator light after 220V is inserted), open the power supply of the induction cooker, and the bulb will flicker darkly when it is bright (while the standby indicator light after 220V is inserted is not bright), open the power supply of the induction cooker, and the power supply will be dark when the bulb is bright; Indicates that the induction cooker has been basically OK.

(2). If the bulb is very bright, it indicates that the IGBT tube is fully open. At this point, if the lamp is removed, IGBT must be burned! Should mainly check the drive resonant capacitor high voltage rectifier circuit.

(3). If the bulb is dark red, open the induction cooker power supply and the bulb brightness will not change. Should mainly check and repair the panel control microcomputer power supply auxiliary power supply circuit.

(4). If the bulb is dark red, open the induction cooker power supply, the bulb a bright a dark flicker, but the pot with the bulb is very bright; Belongs to lift the pot Fried IGBT, should check the CPU drive line disk.

Circuit board IGBT or fuse repair procedures IGBT current fuse or IGBT burn out, can not immediately replace the part, must confirm the following other parts are in the normal state to replace, otherwise, IGBT and fuse will burn out.

1. See if the current fuse is blown.

2. Test whether IGBT breaks down:

Measuring “E” of IGBT with multimeter diode file; “C”. “G” is the breakdown between the three poles.

A: “E” and “G” poles; The positive and negative test of “C” and “G” did not pass (normal).

B: the red pen of the multimeter is connected to the “E” pole, while the black pen is connected to the “C” pole with a voltage drop of about 0.4v (the model is GT40T101 with no three-pole connection).

3. Measure whether the transformer has broken foot and the normal state is as follows:

Multimeter is about 80 Ω resistance measuring transformer secondary resistance; At the beginning of 0 Ω very.

4. Whether the rectifier bridge is normal (test with multimeter diode file):

A: the red pen of the multimeter is connected to “-“, while the black pen is connected to “” with A voltage drop of about 0.9v.

B: the red pen of the multimeter is connected to “-“, while the black pen is connected to the two input terminals respectively, both of which have a voltage drop of about 0.5v.

C: the black pen of the multimeter is connected to “”, and the red pen is connected to the two input terminals respectively, both of which have a voltage drop of about 0.5v.

5. Check capacitor C301; C302; C303; Is it damaged by heat? (if damaged, deformed or melted)

6. Test whether chip 8316 is broken down:

Measurement method: to measure pin 8316 with a multimeter, requirements 1 and 2; 1 and 4; 7 and 2; You can’t short circuit between 7 and 4.

7. Thermal switch insulation protection at IGBT is damaged. The detection of poor key action measures whether the CPU port line is broken

2. Poor key movement

The diode file of the multimeter is used to measure the CPU pole and the grounding end. There is a voltage drop of about 0.7v, and the red pen of the multimeter is connected to the “ground”. Black pen connected to “CPU each terminal line.” Otherwise, the CPU port line breakdown.

Three, the power can not meet the requirements

1. Short circuit of coil coil: inductance of coil coil :PSD coefficient L=157±5 H, PD series L=140±5 H.

2. Is the distance between the pot and the coil normal?

3. Whether the cooker is the designated cooker.

Four, check whether the components are loose, complete.

Inspection of defective conditions after assembly:

1. No heating: check whether the transformer has broken feet.

2. Long ringing after plugging: check whether the temperature switch terminal is plugged in well.

3. Unable to start: check whether the thermistor terminals are plugged in well.

4. No minor substance inspection (no alarm): check whether the resistance R301~R307 is normal.

5. The fan doesn’t work; Check whether the transistor Q2 is burnt out. (generally burned out transistor lead heel has yellow; Diodes can also be measured with a multimeter)

Inspection regulations for important parts of induction cooker.

ZZ08-7188.

Bridge integral, IGBT and high voltage capacitor are important parts of the induction cooker. The inspection regulations for such important parts are as follows:

1, the bridge

1) the bridge must be fully inspected when it is purchased;

2) the transistor characteristic graphic instrument shall be selected for the test equipment;

3) check whether the forward and reverse compression of the bridge conforms to the requirements of the specification;

4) test whether the compression characteristic curve of the bridge is consistent and has avalanche characteristics;

5) check whether the packaging pressure meets the requirements;

6) conduct the temperature test (sampling test), place the samples in the oven for heating, keep the temperature at 80℃ to 8 hours, and then test the pressure curve of the bridge.

7) the defective rate of the bridge inspected is 3‰, which is within the normal range. If the defective rate is more than 3‰, and the performance curve of the bridge is relatively discrete, the inspection shall be stopped, and the supplier shall be notified to analyze the reasons for the defects or return the goods.

As long as understand the induction cooker maintenance is also very easy.