How much do you know about the troubleshooting knowledge of Low price 12 digits display calculator? Let's have a simple understanding together!
1. After booting, the display is dim or sometimes bright and sometimes dark. First, measure whether the voltage of the battery used is normal. If it is normal, you can further check whether the spring pressure of the battery is sufficient and the contact is good. If there is a problem, you can use a stretched spring piece or fine sand to polish the contact of the battery pole piece.

2. There is a digital display after booting, but it cannot be calculated. Check the circuit board with a multimeter to see if there is a short circuit between the terminals of the integrated circuit block. Use a multimeter to check the voltage value of the input terminals of the integrated block keyboard (for L1-3033E chip, it is 24-29 pins). The normal value should be about 0.12V, otherwise it may be It is the integrated block that is damaged. If the voltage is normal, but the operation cannot be performed, it may be that the keyboard is in poor contact, the circuit board has foreign objects, the circuit board is open, or the keys are stuck.
The above is a brief introduction to the troubleshooting knowledge of the Low price 12 digits display calculator.