Bi-D (Bidirectional Printing) Alignment Adjustment - Epson Stylus 820 Service Manual

Stylus Color IIs / Stylus 820

4.1.2 Bi-D (Bidirectional Printing) Alignment Adjustment

Bidirectional alignment is required when the printer mechanism, main board, or printhead (board) is replaced.
Performing this adjustment determines a compensation value to rectify any deviation in the print position.
This deviation could be caused by the different print speeds, which are due to tolerances in the mechanical
components, or to differences in print timing between odd-numbered lines and even-numbered lines in
bidirectional printing. The printer stores the compensation data in the EEPROM on the C160 MAIN Board
and refers to this data when performing bidirectional printing.
1. Perform steps 1 to 5 in Section 4.1.1. Then you see the following menu:
Stylus Program * H90E00E
Model : Stylus Color IIs
Customer : EAI, EAI (Latin America), EAL, ESP, ETT
1. Ink discharge (Black)
2. Ink discharge (Color)
3. Head Angle Adjustment
4. Bi-D Adjustment
5. A4 check pattern (Black)
6. A4 check pattern (Color)
7. Envelope
8. Index Card / Post Card
0. Change Customer & Model / END
13. BLACK Ink Counter Reset
14. COLOR Ink Counter Reset
Select Menu
2. Choose "Bi-D Adjustment" by typing 4 and E N T E R . You see the following menu:
Select Menu ?
3. Choose the type of head currently installed on the main unit. The printer prints the Bi-D pattern with the
current value. (The next value will automatically appear.) Also, the display will change as shown below:
INPUT ADJUST N0. (IF OK INPUT Y & RETURN) ?
ADJUST RANGE (from -36 to 36)
Note:
You also can find any clogged nozzle by printing the sample pattern below.
1-pin
Rev. A
(Bi-d Center -15)
?
BLACK head ———- 1
COLOR head ———- 2
Figue 4-1. Nozzle Configuration Pattern
Adjustments
64-pin
4-3