Why is the external keyboard to POS machine not working?

- Sep 03, 2019-

The cause of the failure: the keyboard line is damaged or the contact is poor, the keyboard main control IC program is lost or invalid, and the circuit components of the external keyboard circuit are invalid;

Solution: Use the software exclusion method and the substitution method to check the relevant components in the following order;

1. Re-write the keyboard master IC definition program;

2. Replace the keyboard line;

3, keyboard master IC;

4, the keyboard main control board is connected to the keyboard circuit related components;

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