The adjustment can change the upper limit height of the waveform of the graph, that is, the luminance is internally adjusted, and the output voltage of the shaft can change the height of the lower portion of the waveform to achieve luminance modulation. The circuit is very distinctive, and the oscillation waveform is not oscillating for the circuit. First check and offset, then check each winding. After breaking the load, it will not vibrate all the time, often internal short circuit and must be replaced.
For example, high-voltage discharge, spark generation generally has two reasons: negative feedback voltage regulator circuit or load disconnection, so that the high voltage is too high, check whether the high-value resistor is broken or damaged, in addition, the filament open circuit will reduce the load and make the high pressure high and high pressure If the lead wire is too close to the ground or is discharged due to moisture or other reasons, it can be carefully examined and handled as appropriate.
For example, the luminance of the panel is out of control, and the brightness of the scanning line is constant. The axis amplifier is abnormal. The normal time adjustment and the emitter polarity can be changed. If it is constant, and the potential is very close, it is breakdown. At this time, the brightness is not dark. If the potential here is too low, it may be damaged.
Normally, the scan line can be brightened to disappear. If the range of change is small, the waveforms of the intestine and the positive end are shown in the figure. If the difference is large, check the pseudo and its surrounding parts. When the "luminance" is adjusted to the minimum, the scan line does not disappear or the maximum is still not bright enough, you can fine tune it. The above are the key points of maintenance and basic principles. The overhaul should be dealt with specifically on specific issues. Figure waveforms of ordinary oscilloscope circuits are very different, and can be mastered through analysis and practice.
Check the high-frequency high-voltage, the general multimeter should have a DC file, the normal value of each pole to ground voltage as shown in the table, can be measured from the tail pipe socket. The normal value of each pole to ground voltage Liu Shufa Bao Junhua electronic disinfection cabinet is a new type of kitchen appliance that has been developed in recent years to integrate disinfection, drying, cleaning and storage of food utensils. It is against Escherichia coli, dysentery and staphylococcus. The killing rate of hepatitis B virus is high, which can effectively protect human health. It can be widely used in families, nurseries, reception rooms, conference halls, offices, hotels, restaurants, and medical and health units.
According to different working principles, electronic disinfection cabinets can be divided into high temperature electronic disinfection cabinets, low temperature normal temperature electronic disinfection cabinets and high temperature ozone dual function disinfection cabinets. The high temperature electronic disinfection cabinet is mainly composed of a box body, a dish cup holder, a far infrared quartz electric heating tube, a sealed disc type bimetal temperature controller, a cabinet door, a power switch, an indicator light, a power line and the like.
It is a high-temperature disinfection using far-infrared quartz electric heating tube, which has the advantages of fast heating speed, strong penetrating ability, good sterilization effect, thorough disinfection, no cooking, no high pressure, no residual poison, no pollution, safety and reliability, and work. When there is no odor production electrode cathode gate first anode second anode day pole filament name, the oscillator should be checked.
Used as a button switch, when pressed, the circuit is turned on, and the disinfection is started. The common fault diagnosis and repair statistics of the high temperature type electronic disinfection cabinet are as follows: the sealed disc type bimetal temperature controller is shown in the AC electromagnetic relay table, please refer to .
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