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Q : How to deal with the problem that GD20UL display "88888" when power on?
A: The possible causes of the failure are:
1. The keypad fails or the keypad wire is not connected properly, fix the connection;
2. The main control board is invalid, need to change;
3. The drive board is not connected properly, fix the connection;
4. The power supply of the drive board has problem.
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