The reason why the power of the laser printer does not display and the power does not start

The market share of laser printers is still important now, because it can mark most metals and non-metal materials, and the price is much cheaper than laser printers. During the re-marking process, it is inevitable that the power does not start and the power does not display some phenomena. Let's analyze the reasons why the power of the laser printing machine does not display and the power does not start:

1 , The laser printer works normally, but when the 'Current' button is adjusted, the power meter has no display and is always zero. If there is no display, the power meter is faulty; if it always displays zero, the sampling signal of the power meter is interrupted. Check whether the DC voltage 12V rectified by the power meter is normal. If it is normal, check whether there is 12V voltage on the 1st pin of the 7805. If so, the three-terminal voltage regulator tube of the 7805 is damaged. After the replacement, the fault is eliminated. If it always shows zero, the power meter sampling signal is interrupted. Inspection method: Use the R×1Ω file of the multimeter to search in the reverse direction according to the circuit schematic diagram.

2. Turn on the main power switch and press the trigger button, the power will not start. The fault is due to the action of the protection circuit, so that the AC 380V voltage cannot be added. First, push on the 'AC380V power' switch, press the power 'start' button, and observe whether the AC contactor is working. Check whether the water pressure protection device caused by the water circulation is connected, otherwise, the AC contactor is damaged. Secondly, use the multimeter R×1K block to check whether the 2K/10W power resistor in the power supply circuit is damaged. If it is disconnected, replace it. After Z, check whether the 12V power supply of the optical deflection motor controlled by the laser printing machine is normal. Use a multimeter to measure whether there is 12V voltage at both ends of the motor. If not, check the input of the rectifier circuit (AC 17V). If not, check whether there is AC voltage at the input and output terminals of the transformer. The input terminal is 220V, and the output terminal is 17V. 220V voltage without 17V, the transformer is damaged, replace it.

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