The E012—HALL initialization signal fault

( when the power on HALL_A HALL_B HALL_C signal is low or high level)

Step of solution:
1)Check the encoder socket  with main control encoder socket interface

2)Check the U3—pin 2 impedance to pin 3(ground) which on the encoder board: about 1.2M ; ( the standby voltage : with the grating angle is different switch between 0V with 5.1V);U3—pin 4 impedance to pin 3(ground) : around 20K (the standby voltage : 1.2V),U3—pin 2 with J1(pin 1 ) whether conduction ( remarks : when encoder is connected with the main control ,the above impedance is different )

3)Check the U4—pin 2 impedance to pin 3(ground) which on the encoder board: about 1.2M ; ( the standby voltage : with the grating angle is different switch between 0V with 5.1V);U4—pin 4 impedance to pin3(ground) : about 20K (the standby voltage : 1.2V),U4—2stitchs with J1(1 pin ) whether conduction ( remarks : when encoder is connected with the main control ,the above impedance is different )

4)Check the U5—pin2 impedance to pin 3(ground) which on the encoder board: about 1.2M ; ( the standby voltage : with the grating angle is different switch between 0V with 5.1V);U5—pin 4 impedance to 3stitchs(ground) : about 20K (the standby voltage : 1.2V),U5—pin 2 with J1(1 pin ) whether conduction ( remarks : when encoder is connected with the main control ,the above impedance is different )