Hitachi IJ UX - Page 288

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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
Conditions that the fault occur
No electrical
charge
(No Ink Drop
Charge)
Ink is stopped. 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.
In sufficient
electrical charge
(Ink Drop Charge
Too Low)
Ink is stopped
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.
Excessive
electrical charge
(Ink Drop Charge
Too High)
Ink is stopped 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.
Model UX, RX2, RX, PXR and PX
Faults
Ink ejection
Conditions that the fault occur
No Ink Drop
Charge
Ink is stopped.
(Ink ejection is kept
in case of the
maintenance mode)
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.)
Ink Drop Charge
Too Low
Ink is stopped
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.
Ink Drop Charge
Too High
Ink ejection is
kept.
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.