Dot Missing 1 - Epson Stylus Color C70 Service Manual

EPSON Stylus COLOR C70/C80

3.1.6.6 Dot Missing 1

This section describes the procedures for solving the problem when the printer is
printing, but no print actually appears on the paper. Because this covers situation when
the nozzles are not firing correctly for even one dot to be printed, and so it is separate
from cases where several dots are fired normally. In this case, you should refer to the
next section (3.1.6.7). The following symptoms for which results can be expected from
checking.
1. Only black ink is not firing at all.
2. Only colored inks (CMY) are not firing at all.
3. None of the colors are printing at all.
Troubleshooting
Table 3-18. Dot Missing 1
Step Check Point
1 Is either CN8 or CN9
connected at an angle or
disconnected? (This is
difficult to ascertain
visually, so be sure to
re-seat the FFCs.)
2 Is the fuse (F1) that is
located in the 42 V line
that is supplied to the
print head blown?
3 Are the FFC connected
to the print head
normal? Check the FFC
by the procedure in step
1.
Overview
Remedy
The illustrations below show connectors CN8 and CN9
which affect printing. Be sure to disconnect the AC cable
and then re-seat it. When re-seating the cable, press the
FFCs by hand to see if they can be pushed in any further. If
they can, then the FFC connections to CN8 and CN9 are
probably loose, even if they are not inserted at an angle. If
this is the case, problems with printing will occur.
Incorrect Condition
Correct Condition
Use an ohmmeter to check the continuity of F1. If there is
no continuity, replace the circuit board or the fuse.
F 1
Check the insertion of the two FFCs while referring to
"Print Head" in Chapter 4. If there are traces of smoke on
the junction board on the head, that print head cannot be
reused. Furthermore, in such cases, the print head and the
main circuit board should be replaced together in order to
prevent the possibility of secondary damage.
Revision A
89