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(1) Check if the connector of drawer fits the definition of SENOR standard drawer connector;
(2) Check if the 6pin crystal connector becomes oxidized or dirty
(3) Check if the 6pin socket becomes oxidized , dirty or out of shape;
(4) Check if the fourth drawer connector is under AC 20V;
(5) Check if the big cable between the communication board and the mainboard looses or drops;
(6) It may be the problem of communication board or circuit abnormalities of mainboard. Please
change a new communication board for testing, if it still doesn’t work, change a new mainboard
for testing again.
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