Potentiometers have a long history, especially Piher potentiometer, which are widely used in various ways, such as constant adjustment and measurement. The Piher potentiometer is usually used to set and fine adjust the resistance value to fine tune the circuit, set the level and adjust the gain. Here are the common malfunctions and repair methods of the Piher potentiometer. The details are as follows:

Faults 1: piher spain potentiometer faults are rotating noise, pin internal circuit breakage, resistance wear, burnout, switch damage, etc.

Faults 2: Carbon film resistors due to excessive flow will also seriously burn out and cause open circuit. It is not convenient to repair the potentiometer which is open when the internal circuit of the pin is broken or the resistance body is burned out. Instead, the piher spain potentiometer is replaced.

Faults 3: For piher spain potentiometer with such faults, the cleaning method can be used to troubleshoot. Namely, the cotton ball dipped with anhydrous alcohol is put into the forceps clip, so that the cotton ball is close to the rotating shaft, so that the alcohol is injected into the resistor along the rotating shaft, and continuously rotates the rotating shaft until the noise disappears.

Faults 4: The main reason of the Piher potentiometer with high rotating noise is the abrasion of the resistor, which makes the contact between the movable contact and the resistor bad, and the value of the resistor big or small, thus producing sound. The multimeter can be used to check the above method, and the pointer will jump.

Faults 5: When the Piher potentiometer pin internal circuit break, there will be potentiometer does not work, that is, when rotating the shaft circuit current or voltage without any change. For volume potentiometers, silent faults may occur or the volume can not be turned off. When the resistance between two fixed pins or between fixed pins and sliding contact pins is detected by a multimeter, the resistance value is infinite or close to infinity, the internal circuit break of the pins can be judged.

The structure and type of Potentiometer pin

Potentiometer consists of sliding shaft, resistor, shell resistor and three lead-out terminals, but there are many types of potentiometers, according to the scheduling method can be divided into direct-sliding potentiometer and rotary potentiometer, according to the number of connected can be divided into single-connected potentiometer and multi-connected potentiometer. According to the characteristics of the resistance output function, it can be divided into three types: linear potentiometer, exponential potentiometer and logarithmic potentiometer. Such as carbon film potentiometer, glass glaze potentiometer, solid core potentiometer, fine conductive plastic potentiometer and other potentiometers.

The connection method of Potentiometer pin

Ordinary potentiometer, the center is the movable piece, the center head inside is a resistance wire, with the resistance wire ends directly connected to two pins, the two pins directly connected to the positive signal and ground, such as one pin connected to 5V, the other pin grounded, at this time there is a 5V voltage on the two sections of the resistance wire, and follow the length of the resistance wire. The voltage of each part of the resistor wire is different, and then you can get any voltage of 0-5V by sliding the pin up and down on the resistor wire. The voltage from 5V to the grounding terminal decreases sequentially. The pin is usually connected to the center of the potentiometer, and the other two ends can be connected arbitrarily. If the direction of adjustment is opposite, the voltage can be reduced sequentially. The two ends of the line are switched.