Epson Stylus pro 7700m, Service Manual

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2.2.3 Carriage Drive Mechanism
The timing belt attached to the base of the carriage unit is driven by the carriage motor, causing the carriage
unit to move along the carriage guide shaft from left to right, or vice versa. The carriage drive motor on this
printer is a 4-phase, 200-pole, hybrid-type stepping motor mechanism, allowing the printer to stop the carriage
or change the carriage movement at any position. The position of the carriage is recognized by the home
position sensor, and position information is fed back to the carriage drive control circuit. This carriage motor
is driven by motor driver IC SLA7041 (see Section 2.3.2.3 for more information).
Table 2-1. Carriage Drive Motor Specifications
Item Description
Motor Type 4-phase / 200-pole hybrid-type stepping motor
Drive Voltage +35 VDC
±
5%
Coil Resistance 10.0
Ω ±
7%
Drive Frequency 960 ~ 4800 PPS
Excitation Mode Constant current unipolar drive, micro step driving
Table 2-2. Drive Terms
CR Speed Frequency Phase Drive Method
Acceleration/
Deceleration
Steps
Mode 1
(200 CPS) 4800
(2400)
r Acceleration/Deceleration Area:
2W1-2 phase + 1-2 phase
r Constant Area: 1-2 phase
Acceleration
40 (5)+110 (55)
Deceleration
32( 4)+112 (56)
Mode 2
(100 CPS) 2400
(1200)
r
Acceleration/Deceleration Area:
2W1-2 phase + 1-2 phase
r
Constant Area: 1-2 phase
40 (5)+40 (20)
Mode 3
(40 CPS) 960
(480)
r Acceleration/Deceleration Area:
2W1-2 phase
r Constant Area: 2W1-2 phase
16 (2)
Notes: 2W1-2 phase means the 1/8 2-2 phase drive control.
Values in parentheses ( ) are values of the 2-2 phase.
2.2.3.1 Platen Gap Adjust Lever
( B )
0.6 mm
Platen Gap Adjust Lever <Plain Paper> <Envelopes>
Eject Frame
Carriage Slider
Pl aten
Printhead
(A )
Figure 2-4. Carriage Drive Mechanism
Operating Principles Stylus Pro Service Manual
2-4 Rev.A