Epson Scan 2500 service manual Carriage Lock Mechanism, Power off sequence, Power on sequence

EPSON Stylus Scan 2500	Revision A
	The PF motor drive is sent to the CR Lock lever via the Paper Eject roller.
CARRIAGE LOCK MECHANISM
	PF Motor pinion gear (CW rotation) → Gear 73.6 → Combination gear →

The carriage lock mechanism prevents the carriage from being left at an uncapped position for a long time which can occur due to user mistakes, physical shock, vibration during transport, and so on. The CR lock mechanism is driven by the stepping PF motor. See Table, “ PF Motor Specifications,” on page 40 for motor specifications.

The PF motor controls the CR lock mechanism as well as the PF mechanism depending on the direction of the PF motor rotation. The CR lock mechanism is located at the right end of the paper eject roller.

Gear 28 → Paper Eject Roller → CR Lock Lever

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.

V

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.

Top view

Bushing 6

Pump Planetary

Lever

CR Lock

Lever

Right-side view

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	Pump			Paper eject sequence:
				When the Load/Eject button is pressed, the printer ejects any paper in
roller
	Planetary			the paper path. If no print data is received at this time, the printer caps
Middle frame Lever Guide				and locks the carriage and then enters the standby mode.
Figure 2-11. CR Lock Mechanism				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.
While the PF motor drive is used for paper feeding (PF motor rotation = CCW),			PF motor torque is always transmitted to the CR lock lever side, but the
the CR Lock Lever is set under the Paper Eject Frame. But the CR Lock lever
			operation of the CR lock mechanism varies depending on the rotation
rises up and locks the carriage when the PF motor rotates CW.
			direction of the motor.
				Clockwise = sets the carriage lock lever
				Counterclockwise= releases the carriage lock lever
Operating Principles		Printer Mechanism Operation			44
			V