Epson Stylus Color C70, Service Manual

Page: 73 / 216

EPSON Stylus COLOR C70/C80 Revision A
Troubleshooting Overview 73
7 Is CN8 on the main
board is disconnected or
almost disconnected? Even though it is the same FFC, signals indicating the
cartridge installation condition are not input to CN9.
NOTE: If CN8 and CN9 are inserted at an angle or if they
are almost disconnected from the connector, there
is a high possibility that direct damage to the head
may occur, and in the worst case, the head driving
transistors (Q9 and Q10) on the main board and
the print head itself may become damaged.
Because of this, handle the FFC very carefully
while working.
When CN9 is disconnected and then reconnected
and the power is turned back on, the fatal error is
cleared, but if CN8 is disconnected, and the power
is then turned back on, an unexpected Ink Out
indication will appear and all of the currently-
installed ink cartridges must be replaced. This is
because CN8 includes the signal that is used to
monitor the internal head temperatures, so that if
CN8 is disconnected the voltage becomes 0 V, or in
other words an abnormal temperature has been
detected. Accordingly, the power should not be
turned on while CN8 is disconnected in order to
avoid wastage of the ink cartridges.
Table 3-7. This section describes the procedures for solving the problem
when an ink out (cartridge out) error is displayed even though
a brand-new ink cartridge has been installed.
Step Check Point Remedy
CN 9
CN 8
8 Has a head hot error
occurred?
1. Install a new ink cartridge and check if the problem
returns to normal. If it does return to normal, the head
hot error is probably the fault of the customer. The
approach to head hot errors has changed from the Stylus
COLOR 900/980, so that with this printer there is no
way to check the history of whether head hot errors
have occurred or not by checking the specified address
in the EEPROM. The differences in heat hot errors
between this printer and the Stylus COLOR 900/980 are
given below.
1.1.The sequence for setting a flag inside the
EEPROM to check if this is the 1st or 2nd
occurrence has been eliminated.
1.2.Because of the above, automatic cleaning does not
immediately occur when the first head hot error
occurs.
1.3.However, if a heat hot error really has occurred, the
ink consumption status is forced to 100% and an
ink out error is displayed so that the current status
of the ink cartridges can be checked.
2. Apart from head hot errors which are the fault of the
customer, there is a danger that these errors can occur as
a result of repair service activity.
2.1.When the head is replaced, the TG value in the first
digit of the head ID for the circuit board that is
currently installed is ignored, and the power is
turned on with the initial ink cartridges installed.
3. In conclusion, the ink cartridges must be replaced in the
case of either item No. 1 and No. 2 above, but for the
service problem in No. 2, use the adjustment program at
the stage before inserting the cartridges to write the
head ID for the currently-installed head to the
EEPROM.
Table 3-7. This section describes the procedures for solving the problem
when an ink out (cartridge out) error is displayed even though
a brand-new ink cartridge has been installed.
Step Check Point Remedy