Epson STYLUS Scan 2500 Service Manual page 39

EPSON Stylus Scan 2500
PLATEN GAP LEVER
Timing
Paper feed
roller
Paper eject
rollers
Paper guide
(front)
Figure 2-6. Carriage Mechanism with platen gap lever (Top view)
As shown in Figure 2-6, the Platen Gap lever can be moved forward or
back to adjust for the thickness of the paper. The PG lever is connected to
the carriage guide shaft, which raises or lowers the carriage depending on
the PG lever position. The nozzle surface remains parallel to the paper in
either position thanks to a tilt adjustment mechanism. Also, the two
parallelism-adjustment levers, one mounted on each side of the carriage
guide shaft, adjust the parallelism between the platen and shaft when the
shaft is installed in the factory. This precise adjustment is necessary to
make sure the gap between the platen surface and the printhead surface
is 1.04 mm in the normal position or 1.74 mm in the thick-paper position.
Operating Principles
Home position
sensor
belt Carriage
unit
Forward
paper) position
(normal)
position
Platen Gap
lever
Printer Mechanism Operation
Carriage
motor
Rear (thick
Parallelism
adjust
lever
Revision A
39