Carriage Lock Mechanism; Paper Feed Motor - Epson Stylus COLOR 440 Service Manual

EPSON Stylus COLOR 440, 640, and 740

2.1.4 Carriage Lock Mechanism

The carriage lock mechanism prevents the printhead from becoming
uncapped, which could happen because of vibration during transport or
mishandling by users. If the printhead is uncapped for a long time, ink
on the printhead surface dries out and becomes thick. This can keep
the nozzle from discharging ink. To prevent this, the printer locks the
carriage under the following conditions:


After power-off:
If the power is turned off during printing or any other operation, the
printer initializes and then locks the carriage in the home position.


After power-on:
The printer locks the carriage after the power is turned on and
automatic power-on cleaning is completed.


After ejecting the paper:
If the Load/Eject button is pressed during printing and no further
data is being received by the printer, the printer ejects the paper,
locks the carriage, and goes into standby. However, if the
Load/Eject button is pressed for paper loading only, the printer does
not perform a carriage lock.

2.1.5 Paper Feed Motor

The paper feed (PF) motor powers not only the paper feed mechanism,
but also the pump mechanism that is used for printhead cleaning. The
type of motor used is a 4-phase hybrid pulse motor. This makes it
possible to use the same motor to perform both high- and low-speed
operations for a variety of paper feeding and ink pumping tasks.
The PF motor for the Stylus COLOR 440 and 640 uses 2-2 and 1-2
phase drive methods, whereas the Stylus COLOR 740 uses 2W1-2,
W1-2, 1-2 and 2-2 phase drive methods. The following tables show the
PF motor specifications.
Table 2-5.
PF Motor Specifications (Stylus Color 440, 640)
Item
Motor type 4-phase/48-pole stepper motor
42 VDC ± 5%
Drive voltage
7 ohms ± 10% (each coil, at 25 °C)
Coil resistance
Drive frequency 100 to 1990 Hz
Control method Bi-polar drive
Table 2-6. PF Motor Specifications (Stylus Color 740)
Item
Motor type 4-phase/200-pole stepper motor
42 VDC ± 5%
Drive voltage
8.8 ohms ± 10% (each coil, at 25 °C)
Coil resistance
Drive frequency 100 to 3240 Hz
Control method Bi-polar drive
Chapter 2 Operating Principles
Description
Description
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