Ink System Mechanism; Pf Measurement Sequence; Pump Unit; Pump Motor Specifications - Epson Stylus Photo R1800 Service Manual

EPSON Stylus Photo R1800/R2400
The fed paper is detected by the PE Sensor, and its leading edge 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 feed mode.
The paper is transferred again 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, a Fatal Error is displayed.
Operating Principles

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 Print Head or Cap Unit. The
Cap Unit has a built-in Head Cleaning Wiper.
The following shows the specifications of the stepping motor that drives Pump
Unit.
Table 2-7. Pump Motor Specifications
Item
Type
Drive voltage
Winding resistance
Inductance
Drive method
Drive IC
The following operations are performed when the drive of the Pump Motor is
transmitted to the Pump Unit.
Table 2-8. Pump Motor Rotation Directions and Functions
Pump Motor Rotation Direction*
CW direction
CCW direction
Note "*": The direction (CW or CCW) was determined viewing the motor from the
output shaft of the motor mounting plate.
Printer Mechanism
Revision B
Specifications
4-phase, 48-pole PM type stepping motor
+42V ± 5% (voltage applied to driver)
10.3Ω ± 10% (per phase at 25°C)
13.4mH ± 20% (1kH,1Vrms)
Bipolar drive/constant-current drive
A6628
Functions
• Cap closing
• Ink suction
• Wiper resetting
• CR Lock setting
• Cap opening
• Pump release
• Wiper setting
• CR Lock resetting
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