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6.6.4 Handling of the charge related faults
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The model PX, PXR and PH 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 in the ready
state. The fault is detected in the ready state only.
Model PX, PXR and PH
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.
Summary of Contents for IJ PH
Page 1: ...Service Manual HITACHI Printer Model PH Revision Aug 2011 Version First edition ...
Page 2: ... Revision of PH service manual Revision Chapter Revised Page ...
Page 13: ...1 2 2 Main body internal PH D 1 8 ...
Page 80: ...3 25 3 25 Circuit diagram of EZJ95 ...
Page 201: ...7 1 7 Attached Drawing 7 1 Circulation System Diagram ...
Page 202: ...7 2 7 2 Electrical Connection Diagram ...
Page 205: ...7 5 7 4 Dimensions around charge electrode and deflection electrode Nozzle diameter 65 um ...