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EPSON Stylus PHOTO 810/820/830 Revision B
Operating Principles Overview 31
2.1.3 Carriage Mechanism
The Carriage mechanism consists of CR motor, Carriage unit (including the Printhead
and CR guide shaft), CR timing belt and CR home position sensor (HP/PE sensor) etc.
Following figure shows you each component for the CR mechanism.
Figure 2-5. Carriage mechanism (Top view)
The following stepping motor controls the CR mechanism on this printer.
Table 2-1. Carriage motor specification
The drive of the CR motor is transmitted to the CR unit via the CR timing belt. And,
the CR home position is detected with the HP/PE sensor. This sensor is available as the
CR home position sensor while the CR motor operates in each sequence. (The function
of this sensor varies depending on the running condition of the motors. It is available as
the PE sensor when the PF motor operates in each sequence.)
When the detection plate molded on the CR unit pushes down the HP detection lever
and the CR home position is detected with HP/PE sensor, HIGH signal is output to the
CPU.
.
Figure 2-6. CR home position detection
Moreover, like the previous printers (Stylus COLOR 480/580), this printer does not
also have the PG adjustment mechanism. Therefore, the CR guide shaft is assembled
with the defined PG value (1.7 ± 0.2 mm).
For your reference, in case that the CR home position is not detected with the HP/PE
sensor although the CR unit moves correctly, the printer indicates the "Fatal error".
And also, in case that the CR unit cannot move outside the home position and the CR
home position is not detected with the HP/PE sensor, the printer indicates the "Paper
jam error".
Items Specifications
Type 4-Phase/ 200-Poles HB Stepping motor
Drive Voltage +42 V +/ - 5% (DRV IC voltage)
Coil Resistance 7.8
Ω
+/ - 10% (per phase at 25 degrees)
Inductance 14 mH +/ - 20% (1KH 1Vrms)
Drive Method Bi-Polar drive
Driver IC
LB1946
(Stylus Photo 810/820)
A6615
(Stylus Photo 820/830)
CR unit
CR guide shaft
CR timing belt
HP/PE sensor
CR motor
HP detection lever
Right side view
CR HP detection plate
HP detection lever
Low signal
High signal
HP detection lever
CR HP detection plate