Epson Stylus Color C70, Service Manual

Page: 69 / 216

EPSON Stylus COLOR C70/C80 Revision A
Troubleshooting Overview 69
13 Is the surface of the
linear scale that passes
through the underside
of the carriage
contaminated with
paper dust? If the surface is dirty, remove the linear scale and clean it
with a cloth moistened with alcohol.
14 Is the inside of the CR
encoder on the
underside of the
carriage blocked with
paper or dust? Also, is
the position of the
linear scale correct? Look through the cut-away part of the mechanism at the
home position side of the carriage and check if the encoder
(photo coupler) is blocked with paper or dust. If it is blocked
with paper or dust, use a cotton swab or similar to clean away
the blockage.
In the same way as above, check the condition of the linear
scale. Ideally the linear scale should be in the middle of the
encoder, but it is okay if the carriage does not touch either
end when it is moved manually.
Table 3-6. Communication Error Checking Point
Step Check Point Remedy
Dust or Smeared Points
CR Encoder
Liner Scale
15 Is the FFC
disconnected from
connector CN1 on the
circuit board
underneath the
carriage, or does it
look to be okay but
when you try to push
it in does it feel as if it
is slightly loose?
CN1 is the connector that handles the input and output
of signals between the main board and the mechanism.
It inputs the various encoder signals to the main board
from the mechanism, and outputs head drive signals
from the main board.
16 During paper back
(ASF reverse drive)
operation, does the
paper back lever not
operate because it
falls off, and does a
double feed error
always appear, or do
paper jams always
occur during paper
feeding?
Please Note that
“Paper back lever” is
located on backside of
“Silent CAM”. The paper back lever is inserted onto the ribbed shaft on the
ASF right frame as shown in the photograph. Because of this,
if the rib becomes broken, the paper back lever may fall off
during operation. If the rib on the paper back lever shaft
becomes broken, replace the ASF right frame or replace the
ASF unit.
17 If the end of the paper back lever itself is broken, or if the
other rib on the underside of the paper back lever (not shown
in the photograph) is broken and the two paper return levers
(back flaps) inside the ASF unit cannot be operated, replace
the paper back lever.
Table 3-6. Communication Error Checking Point
Step Check Point Remedy
Junction Board
CN 1
Rib
Shaft
Paper Back Lever