How to deal with the noise of piano rappers

(1) When the string striking machine moves slowly, there is a slight "click" friction sound, which is caused by the collision between the climbing line and the wooden line; Just correct the position of the climbing line. (2) When the key is pressed, the key nail is worn through, resulting in noise caused by direct contact between the key nail and the wood. Press the key and move the damper with the other hand. If the damper makes a "beep" sound when it is reset, the key nail can be replaced and polished at the same time. (3) After the key is pressed, when the ejector pin is reset, it contacts with the wood of the tumbler and makes a crisp "snapping" sound, which is caused by the falling of loose woolen cloth; Replace it with a new one. (3) When the shock absorber moves, there is a creaking sound between the cushion and the upper end of the spring, which is caused by the abrasion of the cushion and the rust of the spring of the shock absorber; Replace the cushion, rust the spring and coat it with lead powder or wax. (4) The two ends of the damper are not in contact with the strings at the same time, accompanied by hissing, which is caused by the improper position of the triangle and groove of the bass damper; Adjust or re-bond the position of the damping head. (5) There is a "snapping" sound when you hit the key, which is more obvious when you press the string by hand, and the shaking of these parts is very loose, which is caused by the loosening of the fixing screws in various parts; Fastening: linkage rod shaft bracket screw, rotating machine shaft bracket screw, damper shaft bracket screw, damper head screw, adjustable, adjustable and fixed crab nail screw, etc. (6) When the hammer handle and the hammer handle, the hoe and the hammer handle are opened, there will be a "snapping" sound, and the sound of pressing the strings by hand is more obvious. If you can twist these parts by hand; Re-adhesive the open part.