Operating Principles
Mechanism Operating Principles
2.2.3.4 Driving Specifications
Basic control operation
The PG setting in several stages for the Carriage is achieved by moving the CR
Guide Shafts up and down with the DC motor while monitoring with the position
sensors. The control of the DC motor is referred to as Auto PG control (APG
control). The basic operation to realize this control is as follows:
APG control operation mode
Figure 2-13 below shows the relationship between the PG positions and the outputs of
the sensor 1 as well as major applications of the PG positions.
Figure 2-13. PG Positions and Sensor Outputs, and Major Applications
1
<Setting Control>
To move the CR Guide Shafts from the current PG position to a designated PG position, the DC
motor is driven by energization (Duty) according to the time setting, slowed down by receiving
the signal from the sensor 1, and stopped within the PG setting range.
2
<Reset Control>
By unidirectional energization according to the time setting, the DC motor is driven and stopped
at the stopper position. Then PG positions are counted until the Position 1 is reached. Arrival at
the Position 1 is determined when the number of the PG positions is equal to the theoretical value.
1
There are five PG positions, which are determined by a continuous cam profile. Switching
between these positions is permitted in sequence: posi.1
⇔
posi.2
⇔
posi.3
⇔
posi.4
⇔
posi.5
2
The sensor 1 outputs the H and L signals when each PG position area and each area between
adjacent positions are detected, respectively. (See the table below for operation modes.)
3
To set and recognize each PG position area, rotate the motor in the posi.5 direction of the sensor
1 until it is stopped by the stopper. Then rotate the motor back in the posi.1 direction. The five
position areas are recognized in sequence; posi.5
⇒
posi.4
⇒
posi.3
⇒
posi.2
⇒
posi.1. At
this point, posi.1 is established as the first position. This position flag continues this recognition
of the positions until setting of the positions is newly made by a higher sequence.
Each PG position area is set when it is recognized that the signal from the sensor 1 changes as L
→
H (or H
→
L).
Sensor 1 output
PG schematic diagram
End position
Starting position
posi.1
PG–
posi.1-2 posi.2
PG typ
posi.2-3 posi.3
PG+
posi.3-4 posi.4
PG++
posi.4-5 posi.5
Release
Setting
control
posi.1
{
posi.2
{
{
posi.3
{
{
posi.4
{
{
posi.5
{
Reset control
Position not
identified
{
{
←
Reference edge
Low
High
{
mark shows each pair of positions
where basic control takes place.
Reduction gear ratio between PG motor ~ composite gear (flag) = 1/91.93
Reduction gear ratio between PG motor ~ CR Guide Shaft = 1/71.04
Reduction gear ratio between PG motor ~ Release Shaft = 1/73.54
• CR Guide Shaft turning angle = Composite gear turning angle
×
(44/34)
* In any PG changing area, the CR Guide Shafts move up and down (the cam gear rotates). Therefore, the
above conversion equation cannot be used.
• Release Shaft turning angle = Composite gear turning angle
×
(30/24)
Summary of Contents for Stylus Photo RX700 Series
Page 1: ...EPSON StylusPhotoRX700 Scanner Printer Copier SERVICE MANUAL ECOS SEMF05001 ...
Page 9: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Page 17: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Page 51: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 76: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Page 133: ...C H A P T E R 5 ADJUSTMENT ...
Page 146: ...C H A P T E R 6 MAINTENANCE ...
Page 163: ...C H A P T E R 7 APPENDIX ...
Page 175: ...Model PM A900 Stylus PHOTO RX700 Board C583Main Sheet 1 3 Rev H ...
Page 176: ...Model PM A900 Stylus PHOTO RX700 Board C583Main Sheet 2 3 Rev H ...
Page 177: ...Model PM A900 Stylus PHOTO RX700 Board C583Main Sheet 3 3 Rev H ...
Page 178: ...Model PM A900 Stylus PHOTO RX700 Board C583 PNL PNL B Sheet 1 1 Rev C ...
Page 179: ...Model PM A900 Stylus PHOTO RX700 Board C583PSB Sheet 1 1 Rev H ...
Page 180: ...Model PM A900 Stylus PHOTO RX700 Board C583PSE Sheet 1 1 Rev F ...
