Adjustment; Parallelism Adjustment; Using Pg Adjustment Tool - Epson PH890 Service Manual

EPSON Stylus Photo 890/1290

5.2 Adjustment

This section explains the procedure for each adjustment.

5.2.1 Parallelism Adjustment

When you remove/replace the carriage unit, make a parallelism adjustment because
you need to remove the parallelism adjustment bushings. This adjustment enables you
to provide an appropriate distance between the printhead and platen as well as to set the
CR guide shaft in parallel with the paper.
Using the PG adjustment tool is the best way to adjust the PG (Platen Gap) as accurate
as possible. You may substitute a thickness gauge (1.14mm) for the PG adjustment
tool, however, the accuracy of PG may decline comparing to using the PG adjustment
tool.
n
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.
n
Before starting the adjustment, wipe the PG adjustment tool
and thickness gauge with a clean cloth moistened with alcohol.
n
Be careful not to damage the printhead surface or leave any dirt
on it. (Make sure the PG adjustment tool and thickness gauge is
free from any stain, and also do not touch the head surface with
the thickness gauge.
n
Be sure to perform the Printhead Rmoval with the ink
cartridges installed.
ADJUSTMENT

5.2.1.1 Using PG Adjustment Tool

1. Install the right and left Parallel Adjustment Bushings to the printer mechanism by
aligning their marks with the notches on the frames.
To the front
(= gap is widen)
(0)
PG Lever
Figure 5-1. Initial Position of the Parallelism Adjustment Bushing
2. Set the PG Lever to the front side (the "0" position).
3. If the Carriage Unit is locked, unlock it by pushing down the lock lever using
tweezers.
Adjustment
Mark
To the rear
(= gap is narrowed)
Notch on the frame
(+)
Frame
Right Parallelism
Adjustment Bushing
Revision B
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