Epson Stylus SCAN 2000 Service Manual page 40

EPSON Stylus Scan 2000
If the carriage is left uncapped for a long time, ink on the printhead surface gradually
thickens and may clog the nozzles. In some cases, the clogged nozzles may be so
thoroughly clogged that they cannot be cleared even after performing multiple cleaning
operations.
To prevent clogged nozzles, the printer caps and locks the carriage in the following
conditions.
o
Power off sequence:
When power is turned off, even during printing, the printer caps and locks the
carriage at the end of the power-off sequence.
o
Power on sequence:
When power is turned on, the printer automatically performs an automatic (power-
on) cleaning cycle and then caps and locks the carriage.
NOTE: The power-on cleaning cycle is an automatic head cleaning sequence
that is performed every time the power is turned on. The timer IC, which
is powered by the lithium battery, measures the length of time the printer
has been off. The printer selects and performs the appropriate cleaning
operation according to the length of time it has been off.
o
Paper eject sequence:
When the Load/Eject button is pressed, the printer ejects any paper in the paper
path. If no print data is received at this time, the printer caps and locks the carriage
and then enters the standby mode.
However, if no paper is in the paper path when the Load/Eject is pressed, the
printer loads a sheet and does not lock the carriage.
PF motor torque is always transmitted to the CR lock lever side, but the operation of
the CR lock mechanism varies depending on the rotation direction of the motor.
Clockwise = sets the carriage lock lever
Counterclockwise= releases the carriage lock lever
Operating Principles
PAPER PICK UP OPERATION
When the Load/Eject switch is pressed or printing order is input, the carriage unit
moves until the left edge and collides with paper pick up trigger lever. When the
carriage collides with this trigger level, a planetary gear located on the same axis is also
pushed at the same time and conveys the motive power on the platen to the adjoining
gear line side for ASF drive.
Gear 34/ASF
roller drive
gear
Spur 23.2/ASF
roller
transmission
gear
Printer Mechanism Operation
Combination
Paper pickup
gear 16,40.8
trigger lever
Gear 73.6
Figure 2-12. Paper Pickup Mechanism
Revision A
Gear 36/Eject
roller drive
gear
Combination
G 12.4,28/
Eject roller
transmission
gear
PF motor pinion
gear
Combination G
16,21.6/Platen roller
transmission gear
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