Epson SQ-1170, Service Manual

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The basic steps of operation described above are combined in many ways to meet various conditions
of the printer as described below.
(1) Power ON operation
At time of power on, four different ways of operation are possible depending on the carriage position
and timer value.
They are described in a), b), c), d) below. The timer will be reset in the following cases; the
or
operation (described below) is performed, the initial charge operation (refer to this section) is performed,
or the timer indicates
or more when the power is turned on.
a) Carriage Position: Home position
●
Timer Value: Less than 7/days/Less than 24 hours after last printing
The negative pressure release operation and 100-pulse flushing operation will be performed without
performing the cleaning operation. The purpose of this operation is to prevent ink in the
nozzles from drying up by keeping the inside of the cap moistened. After this operation, the
will be capped again.
b) Carriage Position: Home position
●
Timer Value: Less than 7 days/More than 24 hours after last printing
The negative pressure release operation, and 2600-pulse flushing operation, 0.5 second waite, and
2600-pulse flushing will be performed without performing the cleaning operation. After this operation,
the will be capped again.
c) Carriage Position: Home position
●
Timer Value: More than 7 days
The pump performs the ink charge operation for 4 seconds to replace the ink in the tube. This operation
is followed by the negative pressure release operation, cleaner blade operation-2, and capping.
This operation is necessary because the ink kept inside the tube for more than 7 days is subject to
deterioration.
d) Carriage Position: Other than Home position
●
Timer Value: Not relevant
The carriage will be moved to the home position followed by the cleaner blade operation-1. Then the
pump performs the ink charge operation for 2 seconds, followed by the ink discharge operation, cleaner
blade operation-2, and capping.
(2) Cleaning operation
This operation is performed to correct abnormalities such as injection failure (which results in missing
dots or deformed characters). This operation is enabled when the cleaning switch is pressed during
the pause mode. Three modes of operation are used depending on the number of lines printed since
the last cleaning operation.
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