What are the causes for the poor contact of the switch in an electronic scale?

The primary causes for the poor contact of the switch in an electronic scale encompass the adhesion of dirt such as dust and oil stains on the switch, resulting in suboptimal contact. The following are several approaches to address this issue:

1. Clean the switch: Utilize a cleaning agent and a brush to conduct a thorough cleaning of the switch. Repeat the operation several times and subsequently examine whether the switch resumes normal functionality. If this method proves ineffective, the replacement of the switch should be contemplated.

2. Replace the switch: Firstly, confirm the model of the electronic scale and the switch. Select a suitable switch for replacement. The specific steps involve disassembling the electronic scale to locate the position of the switch, precisely removing the original switch and connecting the new one, and ultimately testing whether the switch operates normally.

3. Repair the switch: In the event that one does not wish to replace the switch or lacks the corresponding tools, an attempt to repair the switch can be made. The specific procedures include cleaning the switch, disassembling the switch to observe whether the contacts are overly worn, gently rubbing the surface with fine sandpaper or an eraser, and replacing any damaged components.

Additionally, other common malfunctions and solutions of electronic scales include:
a. Power failure: Inspect whether the power plug and socket have a secure connection and whether the power cord is damaged. It is feasible to attempt replacing the power cord or employing a backup battery to restart the device.
b. Inaccurate weighing or significant error: Verify whether the signal line connecting the sensor and the instrument is fractured or has poor contact. Re-adjust the position of the scale and recalibrate it in accordance with the manual.
c. Display malfunction: Examine whether there is an excessive amount of moisture inside the junction box and dry it using a hair dryer; check whether the display connection line is damaged or has poor contact. If necessary, replace the connection line or the display