Bi-Directional Printing Alignment - Epson LQ-2550 Technical Manual

4.3.6 Bi-directional Printing Alignment

This alignment is required when:
. The even-numbered lines and the odd-numbered lines are misaligned in the bi-directional printing
mode.
The printer mechanism is replaced.
The ROMA board is replaced.
The timing belt is loosened.
The alignment procedure is as follows (see Figure 4-83.):
Step 1: Remove the cartridge cover, and insert the adjustment cartridge in slot A (see Figure 4-82).
Load continuous paper (width: 15 to 16 inches) into the pull tractor.
Step 2:
Turn the printer power on. The LCD displays "x Bi-D Adjustment," and the A and V LEDs blink.
Press the LOAD/EJECT ( E ) switch. The LCD displays "PAPER OUT", and the D LED blinks.
Step 3:
Press E so that the paper is loaded. The LCD displays "OFF LINE," and the a LED blinks.
Step 4:
Press the ON LINE switch (El). The printer enters the menu selection mode, the LCD displays
Step 5:
Step 6: If is pressed, "1 l" characters are printed for four lines in the Draft test mode, and the LCD
displays "Draft mode printing."
If the characters on the odd-numbered lines are shifted to the left when compared with those
on the even-numbered lines, press
pressed, the alignment value increments (the alignment value is displayed on the LCD as
"T [~ xx]"). If the characters on the odd-numbered lines are shifted to the right, press
shift the characters to the left. If
value displayed on the LCD is added and "1 l" characters are printed again for four lines.
Step 7: When the correct alignment value is set, press
"Tar. < +xx>, VR2 < +xx>."
Step 8: Adjust VR2 using either a Philips or standard screw driver, with a thin tip, so that VR2 is set
to the target (Tar.) value. When VR2 is turned clockwise, the alignment value increments, and
when it is turned counterclockwise, the value decrements.
When VR2 is adjusted to the target value, the buzzer wind ring continuously like "Pi-pi-pi,
Step 9: Press El. The printer returns to the menu selection mode (Step 5).
Step 10: If is pressed, "1
displays "LQ mode printing."
If the characters on the odd-numbered lines are shifted to the left when compared to the
even-numbered lines, press
the alignment value increments (the alignment value is displayed on the LCD as "T [+ xx]").
If the characters on the odd-numbered lines are shifted to the right, press H to shift the
characters to the left. If
displayed on the LCD is added and
Step 1 1:
When the correct alignment value is set, press El. The LCD displays
"Tar. < +XX >, VR 1 < +XX> .".
to shift the characters to the right. Each time
is pressed after the alignment value is set, the alignment
characters are printed for four lines in the LQ test mode, and the LCD
l"
to shift the characters to the right. Each time El is pressed,
is pressed after the alignment value is set, the alignment value
characters are printed again for four lines.
4-47
. The LCD displays
is
to