Adjustment; Parallelism Adjustment - Epson Stylus Color 660 Service Manual

EPSON Stylus Color 440/640/740

5.2 Adjustment

This section explains specific procedures for each adjustment required
for Stylus Color 440/640/740.

5.2.1 Parallelism Adjustment

When replacing the carriage assembly or removing it during printer
mechanism disassembly, perform the parallelism adjustment during
assembling and set the standard distance from the surface of the
printhead to the paper surface.


Do not scratch the special coated surface of the PF roller
C A U T I O N
assembly and rib surface of the front paper guide ;B.


Be careful not to leave any mar or dirt on the surface of the
printhead. (Never use a rusty or dirty thickness gauge. Also, do
not push the thickness gauge hard against the head.)
[Right Parallelism Adjustment]
1. Install the "parallelism adjustment bushing" for right and left frame
and set them on the peaking of the upper frame side so that they
match with "the standard mark of parallelism adjustment bushing".
2. Set the PG lever front. (Gap is small.)
3. Move the carriage to the center and set the thickness gauge on the
fixed position of front paper guide ;B as you can see in the figure 4-1
on the next page
4. Move the carriage to the position that the printhead overlaps the
thickness gauge.
Chapter 5 Adjustment


Put the thickness gauge on the flat side of the
C H E C K
P O I N T
rib of the front paper guide ;B.


When you move the carriage, move it, pulling
the timing belt with your hand.
5. Move the right parallelism adjustment bushing to the rear until the
thickness gauge moves with the carriage when you move the
carriage about 20 mm right and left. (Gap will be narrowed.)
6. From this thickness with which the thickness gauge starts moving
with the carriage, move the gear of the right parallelism adjustment
bushing one notch toward you. (Gap will be widen.
7. With the PG lever set front (gap is small) and then rear, move the
carriage right and left and make sure that the thickness gauge does
not move for the both settings.
[Left Parallelism Adjustment]
8. Perform Steps 2 to 7 for the left parallelism adjustment bushing.
[Checking parallelism]
9. Perform steps 1 to 4 again.
10. Make sure that the thickness gauge does not move right and left
along with the carriage when the carriage is moved about 20 mm.
11. Move the right parallelism adjustment bushing one notch to the rear
(Gap will be narrowed).Then check that the thickness gauge moves
along with the carriage. If the thickness gauge does not move, go
back to Step 1 and repeat the adjustment.
12. If the gap is adjusted correctly, move the right parallelism
adjustment bushing one notch toward you (Gap will be widen).
Revision A
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