Thumbwheel potentiometer is also a kind of potentiometer commonly used in the tone function market. We also has many types of dial potentiometers for customers to use on the circuit. Today, I would like to introduce the relevant knowledge of the thumbwheel potentiometer, including the connection method of the thumbwheel potentiometer, the matters needing attention in the use of the thumbwheel potentiometer, such as the thumbwheel potentiometer. He clean up dust and debris and other aspects of the explanation of the thumbwheel potentiometer, I hope to just contact this potentiometer friends to know more about some thumbwheel potentiometer common sense.

Wiring method of thumbwheel potentiometer
From the left, the first foot of the thumbwheel potentiometer is the common end, the second and third feet are left and right double channel output, and the fourth and fifth are left and right double channel input. The left channel is connected with a wire to the left channel, the right channel is connected with a wire to the right channel, and the grounded terminal can be temporarily unused. The dial potentiometer has three points: line input, line output, and grounding terminal. As for the output corresponding to the output, it depends on the metal contact piece on the plastic knob. Generally, PCB substrate signal from left to right direction, the first hole is grounded, the second hole is left channel output, the third hole is right channel output, the fourth is left input, the fifth is right channel input, the second hole and the fourth hole are connected with wires, the third hole and the fifth hole can be connected.

Note on use of thumbwheel potentiometer
1. Thumbwheel potentiometer in use for a long time, to regularly clean up the potentiometer shaft of some dust and debris, such as unclear, accumulated dust will affect the output between the lines, may be in the regulation of failure and other phenomena.
2. It is generally inconvenient to repair such faults as internal circuit breaking or resistance body burning of the lead of the pull-out potentiometer. It is suggested to replace the components.
3. In the connection of the disconnector potentiometer, each line can not be wrong, if there is a wrong connection, there may be incompatible output between the lines, resulting in possible damage to the potentiometer. So pay great attention to wiring.

How to remove dust and sundries from the thumbwheel potentiometer
1. Firstly, use the screwdriver carefully to open the thumbwheel potentiometer lid sealing card slot open, and then remove the potentiometer.
2. Then the fixed rotating shaft of the thumbwheel potentiometer is pulled out of the rotating shaft. Some of the thumbwheel potentiometer with switch can not take out the rotating shaft. At this time, some dust and impurities on the rotating shaft of the potentiometer can be directly cleaned with pure alcohol with a cotton ball.
3. After being cleaned up, some lubricating oil or special grease can be applied on the shaft to delay the service life of potentiometer.
4. Finally, reset the thumbwheel potentiometer and fix it.

Common faults of thumbwheel potentiometer

The thumbwheel potentiometer with switch often suffers poor contact due to friction damage. From the appearance can be thumbwheel potentiometer bad contact fault, you can first open the outside to check the extent of wear. If the chestnut is only slightly damaged caused by bad grafting, you can use anhydrous wine guess, carbon tetrachloride will pull the surface of the potentiometer clean.

There are three kinds of damage to the switch structure of the thumbwheel potentiometer with switch: 1. The switch is not on or off; 2. Poor contact or off; 3. The switch part falls off. These three kinds of faults can be found out by the multimeter or seen by the eyes. During repair, new components must be replaced for the first and third cases. In the second case, the switch can be repaired according to the problems. If the contact is not caused by contact oxidation, the fault can be eliminated by scraping. If the contact is not good because of spring elasticity reduction, the spring can be replaced.