Epson Stylus Photo 950 Service Manual Download Page 68

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EPSON Stylus PHOTO 950

Revision A

TROUBLESHOOTING

Overview

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
EPSON Stylus COLOR 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 EPSON Stylus
COLOR 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

Have the cartridges
been refilled?

Because this printer uses a new type of cartridge, traces of
whether the cartridges have been refilled can basically be
checked. The reasons are as follows.
1. In contrast to previous CSICs, there is no ventilation

hole at the top of the cartridge. There is no refill point
like previously.

2. If a syringe is inserted through the film to charge the

inside of the cartridge with ink, a hole is made in the
film, and so the customer must use measures such as
applying tape in order to prevent ink from leaking out.

The data in the ink
cartridge CSIC chip
(EEPROM) is
corrupted.

Of the many items of data stored in the CSIC chips, the
only item that is updated by the printer is the ink

consumption counter. If 100% is written to this address, the

cause will be one of the following two reasons.
1. Corrupt data in the CSIC chip. The cause of this might be

as follows.

1.1 The data was recorded incorrectly when the CSIC

chip was shipped from the factory (data is

randomly corrupted).

1.2 The CSIC chip was shipped without being

initialized for some reason.

1.3 The hand of the customer touched the chip while

charged with static electricity, and this caused the

data in the EEPROM to be randomized, so that
the data became corrupted.

2. A head hot error as described in No. 7 occurred. In such

cases, the data is not randomized as described above,

but the only part of the CSIC data that is changed is the
ink consumption counter. No data in any of the other

addresses is affected.