E11—HALL initialization signal fault

( when the power on HALL_A HALL_B HALL_C signal in low  level)

Troubleshooting steps
1）Check the encoder socket  with main control encoder socket interface（Whether inside the encoder dusty ）
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 )

4）check the C29 two-terminal impedance on main control board: about 11K .(Standby voltage:5.1V); U2(38 pin) or U6-14 pin to impedance on C4 negative terminal: around 3M (Standby voltage:3.2V
5）check the C39 two-terminal impedance on main control board: about 11K.(Standby voltage:5.1V); U2(52 pins) or U6-18 pins to impedance on C4 negative terminal: 3M detection(Standby voltage:3.2V)
6）check the C41 two-terminal impedance on main control board: about 11K.(Standby voltage:5.1V); U2(64 pins) or U6-7 pins to impedance on C4 negative terminal: around 3M (Standby voltage:3.2V)