Epson Stylus SCAN 2000 Service Manual page 35

EPSON Stylus Scan 2000
Table 2-4. Motor Control at Each Mode
Drive Speed
Printing mode
[CPS]
High Speed Skip 340
Normal Printing 200
Capping 80
Wiping 40
Cap (Valve Release) 20
Withdrawal of cap 5
Rotor
Figure 2-5. CR (PF) Motor Internal Circuit Diagram
Operating Principles
Drive frequency
Drive method
[PPS]
Double1-2, 2-2,1-2
4080
phase drive*
2400 Double 1-2, 2-2 phase drive
2-Double 1-2, 2-2 phase
960
drive
2-Double 1-2, 2-2 phase
480
drive
4-Double 1-2, 2-2 phase
240
drive
4-Double 1-2, 2-2 phase
60
drive
A
1
/A
2
3
B
4
/B
Printer Mechanism Operation
PLATEN GAP LEVER
Timing
Paper feed roller
belt
Paper eject
rollers
Paper guide
(front)
Figure 2-6. Carriage Mechanism with platen gap lever (Top view)
As shown in Figure 2-6, the Platen Gap lever can be moved forward or back to adjust
for the thickness of the paper. The PG lever is connected to the carriage guide shaft,
which raises or lowers the carriage depending on the PG lever position. The nozzle
surface remains parallel to the paper in either position thanks to a tilt adjustment
mechanism. Also, the two parallelism-adjustment levers, one mounted on each side of
the carriage guide shaft, adjust the parallelism between the platen and shaft when the
shaft is installed in the factory. This precise adjustment is necessary to make sure the
gap between the platen surface and the printhead surface is 1.04 mm in the normal
position or 1.74 mm in the thick-paper position.
Revision A
Home position Carriage
sensor motor
Carriage
unit
Rear (thick
Forward
paper) position
(normal)
position
Platen Gap
lever
Parallelism
adjust lever
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