Epson Stylus 1500, Service Manual

Page: 47 / 185

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 in this printer is a 4-phase, 96-pole, hybrid-type stepping motor, allowing the printer to
stop the carriage or change the carriage movement at any position. The carriage position is
recognized by the home position (HP) sensor, and position information is fed back to the CPU.
This carriage motor is driven by the SLA7043M motor driver IC.
Table 2-1. Carriage Motor Specifications
Item Description
Motor type 4-phase, 96-pole, hybrid-type stepping motor
Drive voltage
+42 VDC
±
5%
Coil resistance
5
Ω ±
7 %
Drive frequency 480 - 9600 Hz
Excitation mode Constant current unipolar drive
Minimum step
❏
0.026 mm (at 2W1-2 phase)
❏
0.106 mm (at 1-2 phase)
Table 2-2. Drive Terms (Carriage Drive Mechanism)
Print
Mode
Print
Speed
(cps)
Current Value (A / Phase)
Acceleration
1 / 2
Constant
Deceleration
1 / 2
Rush
(before/after)
Draft (black)
400
0.8 / 0.8
0.7 0.96 / 0.96 0.5 / 0.5
Draft (color) 0.9 / 0.9
LQ 200 0.9 / 0.9 0.7 0.8 / 0.8 0.5 / 0.5
SLQ 100 0.9 / 0.9 0.6 0.8 / 0.8 0.5 / 0.5
CR Mo tor
Drive Pulley
Driven Pulley
Timing Belt
Carriage Unit
HP S e n s o r
CR Guide Shaft
Eject Paper Frame
Figure 2-5. Carriage Movement Mechanism
Operating Principles
2-6 Rev. A