Ultrasonic cleaning its fault analysis and detection

April 25, 2020

When the ultrasonic cleaner fails and does not work properly, the common faults are analyzed as follows:
First, the insurance damage: If there is no power display after booting, no action, first of all, it depends on whether the insurance in the power socket is damaged.
Analysis: It is possible that the user ground wire is mixed with the live wire or the neutral wire, and there is no grounding (the ground wire of the machine is connected to the outer casing of the machine), and there may be a short circuit of the machine, and a short circuit occurs in the aging of the components, resulting in insurance damage.
Detection: Take out the insurance to watch, whether there is a break, use the multimeter to measure the disconnection, and replace the new device.
Second, the transducer is damaged:
Analysis: It may be due to the long-term use of the state, the temperature will gradually rise, causing the colloid melting transducer to fall off or the ceramic part of the transducer to break.
Detection: The insulation strength of the transducer is measured with a shaker. The insulation strength is below 200 MΩ and cannot be used. A new transducer must be replaced.
The internal ceramic of the transducer will also break due to long-term use, making it unable to work properly.
Third, the power tube damage:
Analysis: The power tube on the main board will be short-circuited due to the uninterrupted use of the machine for a long time or the cleaning liquid is used for too long.
Detection: When the power tube is connected on the main board, use a multimeter to measure the resistance of the pins on both sides of the power tube. Under normal conditions, it should be around 22Ω. After taking down the power tube (disconnected from the main board), it should be measured between the various pins.
Fourth, the regulator tube is damaged
Analysis: The damage of the Zener tube is generally caused by the power-tube resistance value being small or short-circuited, and it is rarely damaged by itself.
Detection: According to the characteristics of the diode, forward conduction, reverse termination. It is measured with a multimeter diode file, and the forward resistance is about 70Ω, which is reversed. If the value deviation is too large or the forward resistance is also ∞, replace the new regulator tube.
Five, bridge damage (diode rectifier circuit)
Analysis: the same as the regulator tube status
Detection: also according to the characteristics of the diode (the bridge itself is composed of diodes)
6. Damage to the inductor and isolation transformer
Analysis: Because the machine works for a long time, the inductor and the transformer are heat-dissipating components, which may melt and burn due to excessive temperature, causing a short circuit.
Detection: Inductance, transformer damage, in most cases, visually visible burnout marks, replacement of new devices
7. Damage to the control panel (adjustable ultrasonic cleaner)
Analysis: Long-term continuous work, related components aging, and sometimes related to the penetration of cleaning fluid.
Detection: Disconnect the control board from the motherboard when the machine is not working. Power on the motherboard. If the machine is working, the control panel is damaged and needs to be replaced.

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