Ink Sequence - Epson Stylus Photo R800 Service Manual

EPSON Stylus Photo R800

2.2.6 Ink Sequence

The following ink sequence is executed according to various timer, counter,
flag and other information saved on the EEPROM.
CSIC-related sequence
The ink type code stored in the CSIC Memory Chip is identical regardless
of the Japanese domestic or overseas cartridges, and is saved at the Main
Board EEPROM.
At power-on, data is read from each color CSIC and the CSIC data status
is made valid. If the data read from each CSIC has any problem, Ink
cartridge error or Ink end error is displayed.
After CSIC operation is checked, the ink consumption of the I/C currently
installed per color is compared with the ink consumption saved in the
printer EEPROM, and control is performed under the following conditions.
When current I/C consumption differs (from ink consumption in
EEPROM)
1. On the assumption that the I/C has been changed at power-off, the
first I/C flag is reset.
2. The installation count in the printer EEPROM is updated for the
CSIC. In the CSIC information replacement sequence, the CSIC
side ink consumption data is updated to the ink consumption data
in the printer EEPROM.
3. The used model name data on the I/C side is rewritten.
Note: Reason why the used model name data is rewritten from the
printer to the I/C: To grasp which printer used the I/C removed.
4. The change flag 2 (flag that indicates change CL) is set and CL is
executed.
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OPERATING PRINCIPLES
When current I/C consumption is the same (as ink consumption in
EEPROM)
1. When the initial filling flag is set and the CSIC side ink
consumption is 0, the printer judges that initial filling is not yet
performed.
(The printer before initial filling judges that the I/C is fitted in a
power-off status.)
2. Installation count updating, CSIC information replacement, and
initial filling are executed in this order.
3. If the initial filling flag is not set, the printer judges that I/C change
was not made at power-off and regards the CSIC data as valid.
Data is written to the CSIC at the following timings.
At power-off
In the power saving mode
At the time of Ink Cartridge replacement
At the time of cleaning
1. Data is read from the CSIC and developed in the RAM on the Main
Board.
2. The data is compared with the ink consumption in the printer
EEPROM. If the data are the same, the data is written to the CSIC.
If they are different, only the consumed difference is added and
written to the CSIC. When cleaning is performed, the CL count is
also written, and when the I/C is changed, the installation count is
also written.
Printer Mechanism
Revision A
28