Epson SQ-B50/2550 Technical Manual page 212

REV.-A
The platen gap determine proper printing (= distance between nozzle and paper) and affects the print
quality (dot allignment). If this adjustment is not performed correctly, the following may be affected .
• Dot condition
• Print density
WARNING
Both sides of the nozzle have protective guards. When you place the thickness gauge between
the platen and head, be careful not to touch the gauge to the nozzle. (If it touches the nozzle,
the nozzle surface could be damaged and printing will be affected.) In this adjustment, the gap
between the guard and the platen is adjusted.
Step 1 Remove the printer cover and upper case. (Refter to section 4.2.2.1)
Step 2 Move the paper bail up. Move the printhead to the left side of the platen (near the position where
the scale marking" 1" aligus with the right side of the head) by moving the carriage manually
while pressing the pump unit. (Refer to Figure 4-2)
Step 3 Tighten the two screws clamping the print head to the carriage temporarily so that you can
move it manually.
Right side: CP(P)(M3 X 6)
Left side: CP(P)(M3 X 12)
Step 4 Confirm that the head adjust lever is in the usual place (at the narrow side). (Refer to section
1.2.1.1)
Step 5 Confirm that the inclined adjusting pin on the left side is at the center (the direction of the
projection is exactly to the left). If it isn't, remove the head and replace it. (Refer to section 4.2.1.)
Step 6 Place the thickness gauge between the head and the platen (Le. between the nozzle guard and
the platen) from the side and tighten the screw using the torque driver so that the thickness
gauge can be removed easily.
Platen gap: 1.0
±
0.1 mm
Screw torque: 3 Kg. cm
Step 7 Check the gap at the center and right side of the platen. If it is too narrow (less than 0.9 mm)
or too wide (more than 1.1 mm), go back to Step 6 and adjust it again.
Step 8 When the gap is correct, glue the adhesive to left and right screws. (Refer to section 6)
li'
11 III I
t
1,0'
I11 I1
t
Ilia'
CP(P) (M3
x
6)
,
,
I
I
I
I
I
~
I
I
I
Head adjust pin
~:--:=~~==-=~*----
CP(P) (M3
x
12)
f
Figure 4-64. Platen Gap Adjustment
4-50