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2.
If above is ok，check in accordance with 2.1.
4. Function keys error
1.
Check the connections of keys, and check the welding of AR217 ~ A220.
2.
Check the signals of PIN 1~5 in CON701, the output is pulse.
3.
If no keys be pressed, the signal of PIN 6/7/8 in CON701 is low.
4.
If un-normal, check whether short cut or open circuit between resisters and capacitors.
5. The LED Display error
1. Check the LED and relevant circuit elements, such as AR215, AR216, AL201 and AL202.
2.
Check the signals of PIN 1~5 in CON702, the output is pulse. If un-normal, check Q202, Q203,
Q204, Q205, Q206,Q207, Q208, Q209, Q210,Q211.
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