Maintenance experience of electric shavers

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Maintenance experience of electric shavers [Copy link]

Although electric shavers are manufactured by different manufacturers, their basic working principles are similar. Therefore, some common problems and solutions of YINHE RSZ-918 dual-purpose electric shaver are introduced as follows.

1. Common faults

(1) Electric razors have poor performance, slip, and consume a lot of electricity.

(2) The shaving efficiency is low, the shaving is not clear, the noise is loud, and adjusting the center screw of the blade holder is useless.

(3) The shaving screen is easily worn out after a short period of use. It consumes a lot of electricity.

(4) It sometimes runs fast and sometimes runs slow.

(5) Cannot operate.

2. Cause Analysis and Treatment Methods

1. The manufacturer designed the electric clipper function for this shaver in order to focus on commercial operation, but the effect of daily use is not ideal. After weighing the pros and cons, the author made a bold choice based on the situation of fault (1); all the electric clipper components were removed to achieve the purpose of reducing the load, saving electricity, and improving shaving efficiency.

Method: Unscrew the mesh cover, remove the tool holder, remove the two fixing screws on the motor cover, lift the motor cover, and remove the transmission sleeve on the motor shaft. At this time, you can see a set of simple electric push manipulator structural components, remove them one by one, and only the eccentric peach wheel on the motor shaft is left as a limit.

2. I think that the reason for unclear shaving is that the blade is not sharp is misleading, and there is no need to sharpen the blade. Because the blade is made of high-quality steel, it is supported on the blade holder by spring steel wire at a fixed angle, and it always has a close cutting relationship with the net cover. In the best gap rotation contact, the blade is always sharp, even if the blade is worn to the gap. I have hardly changed the blade or holder during use. The two broken ones in the past were damaged because I didn't pay attention to grinding through the net cover at that time.

Fault (2) is often caused by the gap between the mesh cover and the tool holder being too large, which causes the mesh cover and the tool holder to hit each other. There are two ways to adjust the tool holder of this model: one is coarse adjustment, carefully pry the eccentric peach wheel upward about 0.5-1mm with a small screwdriver. The other is fine adjustment: use a watch screwdriver to adjust the adjustment screw in the center of the tool holder according to the different degrees of looseness and tightness of the sound caused by the friction between the mesh cover and the tool holder. If it is too loose, there will be noise, so it should be adjusted in a clockwise direction.

3. Fault (3) is the opposite of fault (2). The gap between the screen and the blade holder is too tight, which will cause the motor to slightly stall. At this time, the current is definitely abnormal, the torque of the motor decreases, and it often gets stuck when shaving. In addition to the power consumption over time, the screen will also wear out faster. In this case, if the eccentric peach wheel has not been moved, it is generally only necessary to fine-tune the adjustment screw in the center of the blade holder counterclockwise, and then the sound should be a normal "silking" sound. You can also use the DC current range of the multimeter to measure the working current of the entire motor, which should be around 240mA. When the power is cut off, it should be able to rotate by inertia for 1 second. The no-load current (without the blade holder) is about 75mA.

4. Fault (4). If the internal resistance of the battery increases and the motor speed becomes unstable, you can replace the battery. If it still happens, it is because the motor brushes are severely worn and sparked with the motor commutator (copper tile), resulting in carbonized contact resistance, which eventually leads to changes in the motor current and unstable speed. You can use the multimeter Rx1Ω gear to measure the positive and negative leads to the motor, and slowly turn the tool holder or motor shaft by hand. If the needle changes irregularly and the resistance value is large, it means that the motor is faulty. The author solved the problem by transplanting and replacing the copper brushes from other motors, and found it to be quite troublesome. If the reader encounters this situation, you can replace the motor. 5. Fault (5). First of all, you should not easily suspect that the permanent magnet DC motor is damaged, because the DC3V voltage and limited current (5# battery capacity is about 300mA) will not over-current or overheat and burn the motor. The main reason is poor contact. Its shaving head can be adjusted by 90 degrees. Is there a problem of poor contact in this link? No, they are the structural relationship between the copper spring and the copper spring. The more they rotate, the better the contact (very good design). Only when the copper sheet of the switch contact bridge is deformed or dirty, and the positive and negative leads of the motor are in poor contact with the positive and negative poles of the power supply, will the circuit be blocked and the motor fail to rotate.

Treatment method: ① Use an electric hair dryer to heat the aluminum brand decorative plate on the front of the razor handle. It is bonded to the plastic shell with Baide glue. After heating and softening, pry it open at the edge with a small flat screwdriver (be careful of deformation), slowly lift it up and take it away, spray the power supply and switch circuit lead parts with electrical instrument cleaner, remove the verdigris rust, reshape the switch contact bridge, and use the multimeter resistance range to measure whether the switch circuit is normal. ② Remove the battery and use the multimeter R x 1OΩ range to measure whether the positive and negative electrodes of the power supply are open, because they are connected to the motor lead end. If open, withdraw the two motor fixing screws, then lift the motor vertically and put it aside. At this time, the motor resistance is about 2.5Ω. If the circuit is not connected, the positive and negative electrodes of the power supply in the motor base are not connected to the positive and negative electrodes of the motor. This electrode material is phosphor copper skin, which is elastic. After cleaning the two pairs of electrodes, adjust the base electrode upward appropriately, then reset the motor (you will feel the rebound force) and the brand plate (apply Baide glue), and add the battery to use.