EPSON Stylus CX4900/CX4905/CX5000/DX5000/DX5050/CX5900/CX6000/DX6000/DX6050 Revision A
OPERATING PRINCIPLES Printer Mechanism 69
2.2.3.2 Carriage Home Position Detection
1. Current position temporary detection sequence determines if the carriage is in the
carriage lock position and releases the carriage if it is locked.
2. The carriage is moved to the left frame hit position and the carriage motor is
stopped.
3. The position that is specified
steps right from the stopping place is defined as an
origin, and from that time, positional information is monitored by the linear
encoder.
If the positional information could not be gain
ed during detecting carriage home
position due to the following causes, fatal error occurs.
• Obstructions on the carriage path or other factors are giving too much
pressure on the CR motor.
• CR linear encoder failure, CR linear scale defect, etc.
2.2.3.3 Sequence Used for PW Detection
The PW (paper width detection) Sensor installed on the Carriage Unit bottom is used to
control the printer according to various sequences.
The following briefly describes the PW Sensor operating principle.
A dark voltage is measured by the PW Sensor in
three places on the right end plane
(area without the absorber) of the Front Paper Guide every time power is switched on,
and the measurement values are saved into the EEPROM as threshold values.
Threshold value > detection voltage: Paper present
Threshold value < detection voltage: Paper absent
The following sequences are performed.
Paper Left
/Right Edge Detection Control
Before start of printing (immediately after the end of paper locating), or during
printing, whether paper is present or not is detected to prevent off-paper printing
on the Paper Guide by borderless printing used in a wrong way.
Paper Top Edge Det
ection Control
Detects paper leading edge at start of printing. Also sets the amount of extension
for the paper leading edge during borderless printing.
Paper Bot
tom Edge Detection Control
Sets the amount of extension for the paper trailing edge during printing.
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