Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 5 Adjustments
118
5.2 Adjustments
The sections below provide specific instructions for each t
y
pe of
ad
j
ustment.
5.2.1 Parallelism Adjustment
You must perform the parallelism ad
j
ustment after replacin
g
or
removin
g
the carria
g
e
g
uide shaft, or if
y
ou chan
g
e the settin
g
of the
parallelism ad
j
ustment bushin
g
s. This ad
j
ustment sets the standard
distance from the printhead to the paper surface.
1.
Set the ri
g
ht and left parallelism ad
j
ustment bushin
g
s to the center
position mark. This is where the rid
g
e on the top of each bushin
g
ali
g
ns with the notch and the screw hole on the metal frame. See
Fi
g
ure 5-2.
Right Parallelism Adjustment
2.
Set the PG lever to 0
(
forward
)
. This minimizes the
g
ap between
the printhead and the platen.
3.
Move the carria
g
e to the center of the platen. Then set the
thickness
g
au
g
e on the ri
g
ht side of the platen as shown in Fi
g
ure
5-1 on the next pa
g
e.
4.
Move the carria
g
e so it’s over the thickness
g
au
g
e.
5.
Move the ri
g
ht parallelism ad
j
ustment bushin
g
to the rear, which
narrows the
g
ap, until the thickness
g
au
g
e moves with the carria
g
e
when
y
ou slide the carria
g
e about 1 inch
(
20 mm
)
in either direction.
6.
Move the ad
j
ustment bushin
g
one notch forward to widen the
g
ap.
7.
Set the PG lever to 0
(
small
g
ap
)
and slide the carria
g
e ri
g
ht and left
to make sure that the thickness
g
au
g
e doesn’t move with the
carria
g
e.
Left Parallelism Adjustment
8.
Perform steps 2 throu
g
h 7 to ad
j
ust the left parallelism ad
j
ustment
bushin
g
. But this time set the thickness
g
au
g
e on the left side of the
platen
(
see Fi
g
ure 5-1
)
.
Checking parallelism
9.
Perform steps 2 throu
g
h 4 a
g
ain, with the thickness
g
au
g
e set on
the ri
g
ht side of the platen.
10.
Make sure that the thickness
g
au
g
e does not move alon
g
with the
carria
g
e when the carria
g
e is moved about 1 inch
(
20 mm
)
in either
direction.
11.
Move the ri
g
ht parallelism ad
j
ustment bushin
g
one notch to the rear
(
the
g
ap will be narrowed
)
. Then check that the thickness
g
au
g
e
moves alon
g
with the carria
g
e. If the thickness
g
au
g
e does not
move,
g
o back to step 2 and repeat the ad
j
ustment.
CAUTION
 Do not scratch the ribbed surface of the platen or the
special coating on the PF roller.
 To avoid damaging the printhead, never use a rusty,
dirty, or bent thickness gauge. Clean the gauge
before using it, and avoid pressing it hard against the
head.
CAUTION
 Put the thickness gauge on the flat part of the
platen ribs, as shown in
Fi
g
ure 5-1
.
 Move the carriage by pulling it with the timing
belt.

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English