When the ultrasonic cleaner malfunction can not be used normally, generally common is the following eight cases, for these seven cases, analysis and detection.
1. Insurance damage.
After turning on the machine, such as the discovery of no power display, no action, the first thing to look at the power supply seat within the insurance is damaged.
Analysis: It is possible that the user ground wire and the fire wire or zero wire mixed, and no ground (the machine ground is connected to the machine shell), there may be a short circuit in the machine, components aging short-circuit phenomenon, resulting in insurance damage.
Detection: take out the insurance to see if there is a break, use the multimeter through the break file to measure whether to disconnect, replace the new device.
2. the transducer is damaged.
Analysis: may be in use for a long time in the boot state, the temperature will gradually rise leading to colloid melting transducer off or transducer ceramic part of the fracture.
Detection: shaking table to measure the insulation strength of the transducer, insulation strength below 200MΩ has been unusable, must be replaced by a new transducer.
The internal ceramic of the transducer will also be fractured due to long-term use, so that it does not work properly.
3. the power tube damage.
Analysis: The power tube on the motherboard will be used for a long time because the machine is used uninterruptedly or cleaning liquid is too little for a long time, so that the power tube short-circuit situation.
Detection: When the power tube is connected to the motherboard type, use a multimeter to measure the resistance value of the pins on both sides of the power tube, under normal circumstances should be in about 22Ω. After taking down the power tube (disconnected from the motherboard), measuring its various pins should be inaccessible.
4. the voltage regulator is damaged
Analysis: the damage to the voltage regulator is generally in the power tube resistance or short circuit, after the boot caused by its own is rarely damaged.
Detection: According to the characteristics of the diode, positive conduction, reverse as of. Measured with a multimeter diode file, the forward resistance value of about 70Ω, reverse ∞. If the value deviation is too large or forward resistance value is also ∞, replace the new voltage regulator.
5. Bridge damage (diode rectifier circuit)
Analysis: with the voltage regulator condition
Detection: the same according to the diode characteristics (the bridge itself is composed of diodes)
6. the damage to the control board (adjustable ultrasonic cleaner)
Analysis: long continuous work, components aging, and sometimes infiltration of cleaning fluid related.
Detection: in the case of non-working machine, disconnect the control board and the motherboard connection. The main board is energized, such as the machine work, it means that the control board is damaged and needs to be replaced.
7. the inductor, isolation transformer damage
Analysis: Due to the long working hours of the machine, inductors, transformers belong to the heat dissipation components, which itself may melt due to high temperature, burned, resulting in short circuit.
Detection: damage to the inductor, transformer, in most cases intuitively visible traces of burnout, replace the new device.
Do not rush when the ultrasonic cleaner failure, according to the above analysis and detection to solve the problem.