Epson Perfection 4490 Photo, Service Manual

Page: 49 / 105

EPSON Perfection 4490 Photo Revision B
Disassembly / Assembly Disassembly Procedure 49
4.2.15 Removing Torsion Spring
1. Remove the TPU Lower Housing. See Section 4.2.10 on page 45.
2. Remove the TPU CR Drive Belt from the TPU Driven Pulley.
Figure 4-34. Removing the TPU CR Drive Belt (2)
3. Remove the two torsion springs attached to the outer TPU CR Drive Belt.
C A U T I O N
„ When performing the procedure given below, be careful not to
lose the three torsion springs that apply tension to the TPU CR
Drive Belt .
„ The size of a torsion spring and the length of a timing belt have
been modified in the middle of the mass production for
reducing costs.
Because of that, the number of the torsion springs to be
installed and how they are attached differ for the late products.
Make sure to read the technical information (TE05-0371)
before performing the following work.
2-1
TPU CR Drive Belt
TPU Driven Pulley
2-2
A D J U S T M E N T
R E Q U I R E D
To adjust the tension of the TPU CR Drive Belt, attach the three
torsion springs in the following procedure.
1. Move the TPU Carriage Unit to the center.
2. Attach the three torsion springs orienting each as shown in
the figure below.
3. Loop the TPU CR Drive Belt over the TPU Driven Pulley.
4. Slide the three torsion springs to the positions shown in the
figure below.
Figure 4-35. Installing the Torsion Springs
TPU Carriage Unit
TPU CR Drive Belt
TPU Driven Pulley