Epson 7000 Black line = paper Detection, InHP? Yes, Paper exists? Yes, Yes Paper loaded

EPSON Stylus Pro 7000 Revision B

†Paper size detection - right and left edges

Before printing the printer needs to determine the distance from the right and left paper edges to the right frame and left frame (home position). As shown in the following flowchart, the printer flushes the heads to make sure no ink smears the paper as the printheads move across the paper. Then the carriage moves to where paper should definitely be (if loaded properly), near the vertical guide line. There the Paper Width sensor determines the brightness level (high) of the light reflected off the paper. (If no light is reflected, paper is not loaded or is not loaded properly and a “Reload Paper” error occurs.) The carriage moves back toward the home position, where paper definitely should not be if loaded properly, and determines the brightness level (low) when light is not

reflected off the paper. This procedure is necessary to set the high/low levels when adjusting for different media types, such as glossy or plain paper.

Next the carriage moves from the home position toward the opposite frame and measures the distance from the home position to the opposite (right) edge of the paper according to the brightness high and low levels. If the paper edge has not been determined by a certain point (outside of the printheads’ print range), the paper is loaded too far to the right and a “Reload Paper” error occurs

Once the opposite-side paper edge has been found, the carriage moves from the opposite frame to the home position and measures the distance from the opposite frame to the HP-side (left) edge of the paper.

Black line = paper

Detection

Right/Left Edge

edge Dotted line = printable area

No

InHP?

Yes

to psuedo	position
CR moves	suction

Left-top edge

Right-top edge

Perform regular flushing CR moves to near vertical guideline

No

Paper exists? Yes

CR moves to expected no-paper location

Yes

Paper loaded No

Determine “No- paper” signal level CR detects paper edge (HP) side CR determines distance from HP to opposite edge (signal

Yes

Paper exists? No

Opposite edge is determined

CR determines distance from opposite side to HP-

Yes

Paper exists? No

Error

edge on HP side	is found
The

Reload Paper

Error type:

Return

Figure 2-19. Paper Size Detection - R/L edges

Operating Principles Printer Mechanism Operation Outline 73