Bi-D Adjustment - Epson FX-980 Service Manual

FX-980

4.1.2 Bi-D Adjustment

This adjustment is made after the main board or the CR motor has been
replaced. The purpose of this adjustment is to electrically correct the
head wire's point of impact during Bi-D printing. The adjusted value is
stored in the specific address in the EEPROM. Once the value is stored,
it will not be erased if the printer is turned off or the EEPROM is reset.
If the printer is in the emulation mode, characters
output for the Bi-D adjustment will be garbled. If so,
turn ESC/P2 on using the EEPROM Initialization mode.
1. Perform the pre-operation. (See Section 4.1.1.)
2. Select "1. Bi-D Adjustment". The following screen appears.
Figure 4-5. Initial Menu of the Bi-D Adjustment
3. Press the Space key to check the current Bi-D setting condition for
the High speed draft mode. The printer prints the following pattern.
Adjustment


The value "0" shown in the screen shown in Figure
4-5 is the initial value used in the program, which
varies from the one stored in the EEPROM. However,
if the main board has been replaced, the value in the
EEPROM is replaced with "0"as the initial value.


The printing pattern below is a sample for the high
speed mode. Be sure to perform the adjustment in
draft copy mode and LQ mode as well.
Figure 4-6. Bi-D Pattern Sample
4. Output the patterns for the Draft Mode and the NLQ Mode, the rest
of the three modes in the screen (Figure 4-5). Then check that the
vertical lines in the middle row for each mode are aligned. (If no
adjustment is needed, you can turn the printer off, not continuing to
the next step.)
5. Examine the patterns for the three modes output in the previous
steps, and correct the value in the screen shown in Figure 4-5 until
the vertical lines for the center value (Data = 0 in Figure 4-6) are
aligned.
Overview
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