Pump Hp Sensor; Driving Specifications - Epson Stylus Photo RX700 Service Manual

EPSON Stylus Photo RX700

2.2.9.3 Pump HP Sensor

Function : Detection of pump home position
Detector specifications
Item
Detection method Mechanical contact
Model D3C-2220(OMRON)
Voltage 3.3 V ± 5%
Detected Condition
Pump in the HP area
Pump not in the HP area

2.2.9.4 Driving Specifications

Basic operation
Pressurization Applies pressure to the inside of the ink supply passage. Drives the Pressure
control Motor while checking the outputs of the Pressure Sensor and Pump HP
Sensor.
When the Pump HP Sensor turns L
additional pumping actions from the state where both sensors are H, the
motor is stopped by a short brake (Duty = 0) via stop control.
Initial pressurization raises the pressure up to above the threshold value of
the Pressure Sensor to reduce the required number of pumping actions.
If "Cover OPEN" is detected during the driving of the Pressure Motor, the
motor is stopped by a short brake (Duty = 0) immediately, without via the
stop control.
Pressure Releases the pressure in the ink supply passage to atmospheric pressure. If
Pump reset the Pump HP Sensor is H, until it turns as H
is L, until it turns as L
continuously and stopped by a short brake (Duty = 0) via stop control.
(The motor is always stopped with the Pump HP Sensor signal at H to avoid
the condition where the bellows pump may creep if it is stopped in a shrunk
position.)
Operating Principles
Specifications
Detector Output Remarks
H OPEN
L CLOSE
→
H by the specified number of
→ → → →
L H L
→ → → → →
H L H L H, the motor is driven
Mechanism Operating Principles
Figure below shows the relationship between the pressure and the outputs of the Pump
HP Sensor (position detection: Sensor 1) and Pressure Sensor (Sensor 2) during the
operation of the Pressure Pump.
Released to
atmospheric
pressure
Pump reset from H status
H, while if it
Pump reset from L status
Direction of Pressure Motor rotation (as viewed from the output shaft)
Relationship between Motor Operation and Sensor Outputs and Pressure
Pressure
The pressure is prevented from rising too
high by the regulator mechanism
Sensor 2 threshold
value
Additional
pumping
Figure 2-30.
Revision A
Pressure
applied
Sensor 2
(Pressure Sensor)
Sensor 1
(Pressure Pump
Assy)
Motor stopped
Sencer_op_pr.eps
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