A. Check the contact and connection terminal 1,2,3 on counter panel The
failure on main control panel or terminals
A1. Check the terminal 5,6 on
main control panel J1 with multi-meter to see the level output;
A2. If no
level output, check the chip connection with power off, if still no
display, it shall be the failure of main control panel, which shall be
repaired or changed;
A3. If it has level output, check the connection
between terminal 5,6 on main control panel J1 and terminal 4 on
indication boardFailure on direction indication circuit boardA. If above
checking still can not solve the problem, it shall be the problem of
direction indication board which shall be repaired or changed