Epson Stylus Photo 950, Service Manual

Page: 88 / 191

EPSON Stylus PHOTO 950 Revision A
TROUBLESHOOTING Overview 88
3.1.6.9 ASF Driver Abnormal 2
This section describes the ASF operation problems mentioned before in more depth.
The ASF problems that were mentioned previously dealt mainly with problems with
the structural parts on the right side of the ASF, but this section covers the procedures
for checking the causes of problems around the clutch mechanism. Most problems that
occur around the clutch mechanism involve noise. Follow the procedures below to
carry out the necessary checks.
Table 3-22. Dot Missing 3
Step Check Point Remedy
1 Have any parts or units
relating to the carriage
guide shaft been removed
or replaced? Carry out PG adjustment. Refer to Chapter 5 for details.
If this does not apply, proceed to step 2.
2 Has a head ID been
recorded? If no head ID has been input, the TG value combination
will fortunately not result in a head hot error, but the
voltages an frequency correction data that are
appropriate for that head will not be stored on the main
board, and so the control carried out will not match the
head's performance and unstable printing may result.
Refer to Chapter 5 for details.
3 Has the printhead ben
replaced? If angle adjustment has not been carried out, it should be
carried out. Refer to Chapter 5 for details. If the head has
not been replaced, proceed to step 4.
4 Carry out Bi-D adjustment. Refer to Chapter 5 for details.
5 Do the uneven parts of
characters only appear in a
certain raster? Because it is possible that the printer has received a
severe shock in the case of a specified raster, check this
with the customer. If the carriage encoder receives a
severe shock and momentarily stops reading, it may
cause a direct ink firing timing fault even if it does not
result in a fatal error, and this can cause character
distortion for a particular raster.
If the printer has not received a severe shock and
printing can be carried out once more, the problem is not
reproduced again.
Table 3-23. ASF Abnormal 2
Step Check Point Remedy
1 Does noise occur in
the ASF just as the
paper is being fed?
Does noise occur
during hopper reset
when the ASF is
driven in the
reverse direction to
paper feeding? [Abnormal noise during paper feeding]
If the noise occurs at the point where the ASF starts operating
in the paper feed direction, carry out the checks in step 16 to
step 19 of Section 3.1.4.1 or 3.1.6.2.
[Abnormal noise during hopper reset (reverse drive)]
1. Check that the change lever for driving the ASF is correctly
installed to the shaft of the ASF. To check this, refer to the
illustrations below. If the end of the shaft is visible at point
A, then it is set correctly. If the end of the shaft is not
visible at point B, the ASF change lever has come loose
from the shaft, and it should be pushed back on again. Also
check that the torsion spring is not loose or disconnected.
Explanation: If the ASF change lever comes loose, the stopper
function for the clutch will not work at all, so the
LD roller shaft will keep turning but paper will
not be fed when required.
Correct Condition Incorrect Condition
A
B
Torsion Spring
ASF Change Lever