Epson Stylus COLOR 800 Service Manual page 51

The pump unit switches its function depending on the direction in which the pump motor rotates, as show
in Table 2-8;
Motor rotation direction
Clock
(Forward)
Counter clock
(Reverse)
Note) The directions for the rotation are described when the motor is viewed from the pinion gear
side.
The pump motor for this printer also drives the ASF mechanism. See Table 2-6 for its specification. The
drive terms for the pump motor in the pump mode is as shown in Table 2-9.
Absorption Mode Frequency
High speed
Normal speed
Low speed
At disengage
Rev. A
Table 2-8. Pump Motor Rotation and Function
wise direction Color ink absorption, Color ink false absorption,
Color ink Micro absorbing, Resetting the wiper
wise direction Black ink absorption, Black ink false absorption,
Black ink Micro absorbing, Setting the wiper
(Clock Wise Direction)
(Counter Clock Wise Direction)
Figure 2-12. Pump Mechanism
Table 2-9. Pump Motor Drive Terms in the Pump Mode
Pulse
interval phase
1350 741
675 1481
281 3559
141 7092
Function
Pump Motor
Pump Motor
Acceleration step
W1-2 2-2 1-2
phase phase
30
18
0
0
Operating Principles
Deceleration step
W1-2 2-2 1-2
phase phase phase
30
18
0
0
2-11