EPSON Stylus Photo 1390/1400/1410 Revision B
OPERATING PRINCIPLES Printer Mechanism 31
The fed paper is detected by the PE Sensor, and its front end is then transferred to the
front of the Front Paper Guide.
To eliminate the deflection of the paper, the paper is then returned toward the ASF
Assy by the specified number of steps according to the paper feeding mode.
The paper is re-transferred to the specified paper locating position of the Front Paper
Guide.
2.2.4.2 PF Measurement Sequence
The mechanical load in the paper feeding path is measured in the following cases
to perform control so that an adequate current value is set according to the
mechanical load.
When power is switched on
When the Ink Cartridge is replaced
When the mechanical load in the paper feeding path reaches the specified value,
Fatal Error is displayed.
2.2.5 Ink System Mechanism
The Ink System Mechanism consists of the following units.
Pump Unit (including the CR Lock Lever)
Cap Unit
2.2.5.1 Pump Unit
The Pump Unit is designed to suck ink from the Printhead or Cap Unit. The Cap Unit
has a built-in Head Cleaning Wiper.
The following shows the specifications of the stepping motor that drives the Pump
Unit.
The following operations are performed when the drive of the Pump Motor is
transmitted to the Pump Unit.
Note * : The direction (CW or CCW) was determined by viewing the motor from the output
shaft of the motor mounting plate.
Table 2-7. Pump Motor Specifications
Item Specifications
Type 4-phase, 48-pole PM type stepping motor
Drive voltage +42V ± 5% (voltage applied to driver)
Winding resistance 10.3Ω ± 10% (per phase at 25°C)
Inductance 13.4mH ± 20% (1kH,1Vrms)
Drive method Bipolar drive/constant-current drive
Drive IC A6628
Table 2-8. Pump Motor Rotation Directions and Functions
Pump Motor Rotation Direction* Functions
CW direction
• Cap closing
• Ink suction
• Wiper resetting
• CR Lock setting
CCW direction
• Cap opening
• Pump release
• Wiper setting
• CR Lock resetting
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