Bi-D Alignment Adjustment - Epson 440 Service Manual

4.2.2.5

Bi-D Alignment Adjustment

This adjustment defines the carriage drive control parameters to compensate the variation in mechanism
components characteristic so that the print position become even in bi-directional printing. This adjustment
is required when one of the following service is made:

Replacing the printer mechanism

Replacing the main board (C200 MAIN)

Replacing the CR Motor assembly

Replacing the carriage assembly and related components
The values defined with this adjustment are stored in EEPROM on the main board.
1. If the printer mechanism is replaced, the ink charge operation and the VH Setting operation should
be performed prior to this adjustment. (Refer to section 4.2.2.2 and 4.2.2.3)
2. Connect the PC to the printer and turn on the printer.
3. Go to the main menu [SCREEN-4].
4. Input "4" to select "Bi-d Adjust" and press ENTER key.
5. The program prints the check pattern (one with the compensation value="0" and another two patterns
each printed with the value "-2" and "+2"). Select the number of the pattern with which the printed lines
are most properly aligned, and input the number and press ENTER key at the menu [SCREEN-7]. Then,
the program print the sample pattern with the compensation value you have selected.
If all patterns printed by the program are completely mis-aligned, confirm the inclination of misalignment
with the pattern printed with the value "0" by checking the relative position of the EVEN line to the ODD
line:

If EVEN line is shifted to RIGHT = Requires (-) value

If EVEN line is shifted to LEFT =
Then, once input "Y" and press ENTER key to return to the main menu, and input "E" to select "Go to
SETTING MENU" and press ENTER key. At the setting menu screen [SCREEN-3], input "6" to select "BI-
D Center" and input the approximation number that corresponding to the inclination of misalignment you
have confirmed previously. After changing the reference value for the Bi-D alignment check printing,
input "1" to select "(Production)" and back to the main menu and continue for the Bi-D alignment
adjustment.
6. If the alignment is correct, input the pattern number at the menu [SCREEN-7] and after completing
the sample pattern printing, input "Y" and press ENTER key to define the compensation value.

Timing to write the specified value to EEPROM: Upon pressing ENTER key after input "Y".
Rev. A
Requires (+) value
WORK POINT
Figure 4-7.Bi-D Alignment
Chapter 4 Adjustment
4-11