Adjustment; Pg Adjustment - Epson Stylus Photo 720 Service Manual

EPSON Stylus Photo 720 / EPSON Stylus Photo EX3

5.2 Adjustment

This section describes the detailed procedures of each adjustment.

5.2.1 PG Adjustment

When replacing or removing the Carriage Assembly during Printer Mechanism
disassembly, perform the PG Adjustment when assembling it back to get the standard
distance from the printhead surface to the paper surface.
Do not scratch special coated surface of the PF Roller and rib
n
C A U T I O N
surface of the Front Paper Guide.
Be careful not to leave any dirt or scars on the surface of the
n
printhead.
Never use a bent (curved or tilted) or rusty thickness gauge.
n
Such a thickness gauge may cause clogged printhead nozzle.
C H E C K Thickness gauge = 1.14mm
P O I N T
Do not use 1.04mm thickness gauge used for Stylus Photo 700.
Paper Gap Adjustment
o
1. Install the Right and Left Parallelism Adjust Bushing for R/L Frame and align the
standard mark of Parallelism Adjust Bushing with the protrusion of the Upper Frame.
2. Set the PG Lever to front. (Gap: "0")
Adjustment
3. Move the carriage to the center and set the thickness gauge (1.14mm thick) on the flat
face of the specified rib of the Front Paper Guide as you see in the figure5-1. Perform
the PG Adjustment from the Right (HP side) Front Paper Guide.
Left
Avoid last two ribs
on left side
PF Roller Assembly
Figure 5-1. PG Adjustment - Use of Thickness Gauge
4. Move the CR Unit to the position that the Printhead Nozzle Plate overlaps the
thickness gauge.
Put the thickness gauge on the flat side of the rib of the Front
n
C H E C K
Paper Guide.
P O I N T
When you move the carriage, pull the timing belt by your hand.
n
5. Move the Right Parallelism Adjust Bushing to the rear until the thickness gauge starts
moving with the carriage when you move the carriage about 20mm right and left.
(When you move the Right Parallelism Adjust Bushing to the rear, gap will be
narrowed.)
If the thickness gauge already moves with the carriage, move the Right Parallelism
Adjust Bushing to the front (=gap will be widen).
Adjustment
Front Paper Guide
Thickness Gauge
Carriage
Assembly
Put the gauge on a flat surface,
and then align the center of the
gauge with the ribs.
Front Paper Guide
Revision A
Right,
HP side
96