Removing Torsion Spring - Epson Perfection 4490 photo Service Manual
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EPSON Perfection 4490 Photo
4.2.15 Removing Torsion Spring
When performing the procedure given below, be careful not to
C A U T I O N
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.
1.
Remove the TPU Lower Housing.
2.
Remove the TPU CR Drive Belt from the TPU Driven Pulley.
2-2
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.
Disassembly / Assembly
See Section 4.2.10 on page 45.
2-1
TPU CR Drive Belt
To adjust the tension of the TPU CR Drive Belt, attach the three
A D J U S T M E N T
R E Q U I R E D
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
3. Loop the TPU CR Drive Belt over the TPU Driven Pulley.
4. Slide the three torsion springs to the positions shown in the
Disassembly Procedure
the figure below.
figure below.
TPU Carriage Unit
TPU Driven Pulley
TPU CR Drive Belt
Figure 4-35. Installing the Torsion Springs
Revision B
49
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