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When the ink supply valve opened or closed, valve open/closed detection sensor could not detect the valve cam rotation.
<Probable fault location>
Valve open/closed detection sensor, valve motor, or main controller PCB
<Countermeasure>
1) Visual check
Remove foreign substances from the motor, gear, and sensor of the valve open/close mechanism if any.
2) Valve open/closed detection sensor
Select [SERVICE MODE]>[I/O DISPLAY] to check for normal operation. If the operation is abnormal, replace the valve open/closed detection sensor.
3) Valve motor
Select [SERVICE MODE]>[FUNCTION]>[INK VALVE] to check for normal operation. If the operation is abnormal, replace the valve motor.
4) Replace the main controller PCB.
If it ain't broke, don't fix it
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