Epson STYLUS Scan 2000 Service Manual page 41

EPSON Stylus Scan 2000
The PF motor drive is sent to the CR Lock lever via the Paper Eject roller.
PF Motor pinion gear (CW rotation)
Gear 28 Paper Eject Roller
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 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.
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.
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.
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
Gear 73.6 Combination gear
CR Lock Lever
Printer Mechanism Operation
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.
Combination
Gear 34/
gear 16,40.8
ASF roller
drive gear
Spur 23.2/ASF
roller
transmission
Gear 73.6
gear
Figure 2-12. Paper Pickup Mechanism
Revision A
Paper pickup
trigger lever
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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