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Operating Principles
2.4.1.8 Disengage ON Operation
This operation sets the switch lever to the position where it transmits the PF motor drive to the
pump mechanism.
1) Moves the carriage to the position D where the lever is set to the specified position.
2) Moves the carriage to the position B.
3) Release a mechanical pressure of the paper feed drive mechanism. (Generates a backlash.)
4) Moves the carriage to the false absorbing position.
5) Adjusts the gear phase with the pump drive mechanism gears.
6) Moves the carriage to home position.
2.4.1.9 Micro Absorbing Operation
A small amount of air possibly gets into the ink path as a form of tiny bubble when the ink
cartridge is removed from the carriage after once it is installed. Such a small air bubble blocks the
ink path to obstacle an ink injection from the nozzle. This operation eliminates small air bubble
from the cavity of the printhead.
1) Performs the false absorbing operation.
2) Performs the micro absorbing operation.
2.4.2 Counter and Timer
EEPROM LE93C46 (IC1O) on the main board stores certain counter and timer values that are used
for control of the ink system operation.
2.4.2.1
Refresh - I Timer
This timer is used to prevent an increase in viscosity of the ink inside the nozzle. It counts every30
seconds during the printing operation. It resets when:
the refresh - I operation completes.
2.4.2.2 Flushing Counter
The flushing counter consists of the following counters.
Ink level counter R
2.4.2.3 CL Counter K
This counter is used to switch cleaning operation mode, to prevent an excessive ink drainage. The
counter value is changed when CL1 or CL2 cleaning operation is performed.
2-22
This counter indicates the amount of ink that exists in the cap, in
proportion to the number of flushing operations. When the counter
value exceeds or equals 5600 (R 2 5600), the printer performs the
false absorbing operation.
This counter is used to: 1) keep a wet condition inside the cap, 2)
perform the wiping operation regularly to remove dust or ink that is
attached to the head surface. The "operations activated by this
counter differ for 1) and 2) as follows:
1) The flushing operation is performed based on the counter N value
at the flushing position, when the printer is in the standby state.
2) Wiping is performed when counter N value is equal to an integral
multiple of 60.
STYLUS 800 Service Manual
Rev. A
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