per the maintenance manual..... 1255= Lc sub-tank supply error...

5.5.2.19 Engine error 125x: Sub-tank supply error


x: 0= No. 1 head (Bk), 1= No. 2 head (Lm)....,5= No. 6 head (Lc).

The sub-tank sensor does not turn to less than half even though the ink is consumed.
This error is checked at ink supply.


(1) Sub tank sensor: Half, Full
(2) Sub-tank sensor relay cable (L/R), Sub-tank sensor cable (L/R)
(3) IPB1 board


(1) When the sub-tank is in full state, enter to the maintenance mode using the cancel-shift
powering on described in 5.9 Special Power-On Procedure.
Enter to the pump solenoid 1.2 from the actuator menu and cut the outside air by turning
it OFF.
Enter to the pump motor and discharge the ink of the sub-tank by driving the pump
motor forward.
Check whether the ink supply motor drives by turning the power on again when the ink
is little.
If the motor is not driven, replace the corresponded cable, ink supply motor unit.
(2) Check whether the sensor plate of the sub-tank sensor works correctly.
Check whether no foreign material that is blocking the sensor action is not caught in the
cantilever.
(3) Enter to the maintenance mode using the cancel-shift powering on described in 5.9
Special Power-On Procedure.
Enter to the sub-tank sensor ink supply x (s= 1, 2, 3, 4, 5, 6) from the monitor menu.
Check whether there is a response of the sensor for display of black/white part by
rotating the corresponded gear manually.
If there is not response, replace the sensor.
(4) Replace the ink supply sensor cable.
(5) Replace the IPB1 board.