Hitachi IJ UX Service Manual page 288

6.5.13 Handling of the charge related faults
- The model after PX are changed from the model KX in terms of handling of the charge
related faults as follows.
Model KX
Faults Ink ejection
No electrical Ink is stopped.
charge
(No Ink Drop
Charge)
In sufficient Ink is stopped
electrical charge
(Ink Drop Charge
Too Low)
Excessive Ink is stopped
electrical charge
(Ink Drop Charge
Too High)
Model UX, RX2, RX, PXR and PX
Faults Ink ejection
No Ink Drop Ink is stopped.
Charge
(Ink ejection is kept
in case of the
maintenance mode)
Ink Drop Charge Ink is stopped
Too Low
Ink Drop Charge Ink ejection is
Too High kept.
Conditions that the fault occur
The APH waveform is checked, and the fault occurs when the APH
signal is not detected in a given time.
The ink stream bent is detected. The fault is detected in the ready
state only.
The APH waveform is checked, and the fault occurs when the APH
signal is lower than the threshold level in a given time.
The insufficient electrical charge caused by a fault of the ink drop
generation status, and the ink bent are detected. The fault is
detected in the ready state only.
The APH waveform is detected, and the fault occurs when APH
signal exceed the judgment value in a given time.
The leakage noise and external noise are detected. The fault is
detected in the ready state only.
Conditions that the fault occur
The APH waveform is checked, and the fault occurs when the
APH signal is not detected in a given time.
The ink stream bent is detected.
The fault is detected in the standby state also.
Ink ejection is kept when the IJP is the service maintenance
mode to clear the cause of the trouble.
(The fault occurs when ink is not charged even when the ink is
ejected. In this case, it should be clarified whether the ink drop
generation status is wrong or charge voltage is not output while
ink ejection is kept.)
The APH waveform is checked, and the fault occurs when the
APH signal is lower than the threshold level in a given time.
The insufficient electrical charge caused by a fault of the ink drop
generation status, and the ink bent are detected. The fault is
detected in the ready state only.
The APH waveform is detected, and the fault occurs when APH
signal exceed the judgment value in a given time.
The leakage noise and external noise are detected in the ready
state. The fault is detected in the ready state only.
6-70