Epson STYLUS 4001968 Service Manual page 40

Operating Principles
2.3.2.3 Ink
End Detection
The IE (Ink End) sensor attached to the carriage detects, not only the ink end, but also when ink is
low and whether an ink cartridge is installed. The detected status is classified to five modes
according to the output voltage level of the IE sensor.
Mode A: No I/C (Abnormal conduction)
Mode B: Ink is low
Ink end (During pump operation)
Ink end (During printing)
Mode D:
Mode E: No I/C (not installed)
Figure 2-16. Ink End Detection Sequence
When the ink end detection operation has determined ink status, the printer indicates the status on
the control panel, as described
1) During printing:
2) During pump operation:
3) In stand-by state:
2-14
Ist check
A < Vout c B ?
below:
If Mode D (ink end) or Mode A or E (no I/C) is detected, the
error.
If Mode C is detected, the printer indicates an "INK END" error after
the detection operation sequence completes and interrupts pump
operation.
If Mode A or E is detected, the printer indicates an "INK END" error
after interrupting the pump operation.
If Mode D or Mode A or E is detected, the printer indicates an "INK
END" error on the control panel.
STYLUS 800 Service Manual
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