Carriage Mechanism - Epson Stylus C40UX Service Manual

Stylus C40UX/C40SX/C20UX/C20SX

2.1.3 Carriage Mechanism

The carriage mechanism consists of Carriage motor (CR motor), Carriage unit
(including printhead), CR timing belt, CR guide shaft, CR guide frame, CR home &
I/C detector (HP/PE/IC sensor) etc. The carriage mechanism moves the carriage back
and forth according to the drive from the carriage motor. The following stepping motor
is mounted to drive CR mechanism. (See the table below.)
Table 2-1. Carriage Motor Specification
Items Specifications
Type 4-Phase/ 48-Pole PM Stepping motor
Drive Voltage +42 V +/ - 5% (DRV IC voltage)
Coil Resistance 10.8 +/ - 10% (per phase at 25 degree)
Inductance 15 mH +/ - 20%(1KH 1VmA)
Drive Method Bi-Polar drive
Driver IC XC901503FNR2
The drive from CR motor is transferred to the CR unit via CR timing belt. And the CR
home position is detected with the HP/PE/IC sensor. This sensor is available as CR HP
detector only in the HP (home position) detection sequence & pump operation
sequence. (not available in the paper feeding sequence for the CR HP detector because
it is used for only PE sensor during the paper feeding sequence.) Moreover, unlike the
previous products, this printer dose not have the PG adjustment mechanism.
CR unit
Figure 2-4. Carriage Mechanism (Top view)
Operating Principles
HP/PE/ICSensor
CR Motor
CR Timing belt
CR home position is detected with the HP/PE/IC sensor and the detection plate molded
in the CR unit as following figure. When the CR home position is detected with this
sensor, HIGH signal is output to the CPU.
HP/IC detection Lever
CR HP detection plate
Figure 2-5. CR home position
Unlike the previous products, I/C detection sensor is not built in the CR unit.
The I/C is detected with the HP/PE/IC sensor and the detection plate molded on the I/C
cover as following figure. The I/C installation condition is monitored only when the
CR unit moves to the I/C detection position (HP detection sequence). So, this sensor
function is not available in the paper feeding sequence. When the I/C is not installed
into the CR unit, HIGH signal is output to the CPU.
HP/IC detection Lever
I/C detection plate
Figure 2-6. I/C detection position
Overview
Revision B
Right side view
CR HP detection plate
HP/IC detection
Lever
High signal
Low signal
Right side view
I/C detection plate
HP/IC detection
Lever
High signal High signal Low signal
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