EPSON Stylus PHOTO 810/820/830

Revision B

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.

HP/PE sensor

 

CR motor

 

 

 

HP detection lever

 

 

 

 

 

CR unit

 

CR guide shaft

 

CR timing belt

 

 

 

 

 

Figure 2-5. Carriage mechanism (Top view)

The following stepping motor controls the CR mechanism on this printer.

 

Table 2-1. Carriage motor specification

 

 

 

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)

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

 

 

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HP detection lever

 

 

 

 

 

 

 

Right side view

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CR HP detection plate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HP detection lever

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CR HP detection plate

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low signal

 

High signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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".

Operating Principles

Overview

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