Why is the keyboard button on the POS machine not coded?

- Sep 03, 2019-

Fault reason: keyboard key failure, keyboard film failure, matrix circuit matrix IC failure, keyboard master IC program failure;

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 key or keyboard membrane;

3. Keyboard matrix IC or diode;

4, keyboard master IC;

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