Line Up Adjustment - Mitsubishi Electric CP-D70DW Service Manual

LINE UP ADJUSTMENT

Drag line and faint black color can be improved by carrying out the head line up adjustment. (Drag lines are streaks that may
appear following dark parts of the printed image depending on the situation.)
1. Remove the screw "b" of the head guide cam on each side and then turn the head guide cam to improve the drag line or
faint black color according to the following note.
[Note] By moving the head toward the bottom of the product, faint black color is improved. By moving the head toward the top of
the product, drag line is improved. By rotating and securing the head guide cam, you can move the head up and down.
(The distance from the center of the head guide cam to each of its sides (a) is different. By rotating the head guide cam
to change the side that comes into contact with the bearing of the platen roller, you can change the distance from the
bearing of the platen roller (a). Because the bearing of the platen roller is secured, the head moves up and down. As the
distance from the center to the side (a) increases, the head moves downward, and as the distance decreases, the head
moves upward.)
Locate the deepest groove of the head guide cam to the back center and defi ne the positions therefrom as +1, +2 , -1 and -2
to the right and left direction. When the head guide cam is turned in the direction "c" to the position +1 or +2, the head moves
upward. When the cam is turned in the direction "d" to the position -1 or -2, the head moves downward. (Turn both right and
left cams in the same direction and same amount.)
Name of side
+2
+1
0
-1
-2
Back side
Deepest groove
2. Tighten the screw "b" of each head guide cam.
3. Repeat the procedures 1 and 2 until the drag line or faint black color is improved to the best level.
Front side
Head 1 ASSY
Distance from the center to the side Head location
The distance
gets longer.
Top side
Head guide cam
+2
-2
-1
0
d
c
Head guide cam
b
Bearing of platen roller
Head location
The head moves
downward.(Faint black
color is improved.)
Front side Front side
Head 1 ASSY
+1
- 26 -
a
Back side
Rotating direction from 0
The head moves
upward.
(Drag line is improved.)
Top side
Head guide cam
+2
+1
0
c
d
Turn the head in the
direction "c."
Turn the head in the
direction "d."
Back side
Deepest groove
-2
-1