User`s manual

1–5Introduction
Diagnostics:
• Built–in diagnostic self–tests
• Configuration printout
• Test pattern printout
• Data stream hexadecimal code printout
Line Matrix Printing
The LG06 and LG12 are line matrix impact printers: they create characters
by printing patterns of ink dots on paper, an entire line at a time. The dot
pattern of each text character is stored in printer memory on a logical grid
called the dot matrix. (See Figure 1–1.)
The printed dots are made by a row of hammer springs mounted on a shuttle
that sweeps rapidly back and forth. Printer logic divides every printable line
into horizontal dot rows. With each lateral sweep of the shuttle, the hammer
springs put dots at the required positions for the entire line by striking a
moving ink ribbon and the paper.
When the shuttle reaches the end of a sweep, it reverses direction, the paper
is advanced one dot row, and the hammers print the next row of dots as the
shuttle moves in the opposite direction. (See Figure 1–2.)
After a line of characters is printed, hammer action stops while the paper is
advanced to the first dot row of the next print line. The number of rows
allowed for line separation depends on the line spacing you select.
PATTERN STORED IN PRINTER LOGIC AS A DOT
MATRIX.
Figure 1–1. Dot Matrix Character Formation