Eeprom Control Driver Circuit - Epson Stylus COLOR 900 Service Manual

EPSON Stylus COLOR 900/900N Chapter 2 Operating Principles

2.3.11 EEPROM Control Driver Circuit

Data for various factory-adjustment items is stored in the EEPROM
(IC7) on the C265 main board. The size of the EEPROM is 2 K bit.
When the printer is turned on, data stored in the EEPROM is transferred
to the D-RAM by the ASIC (IC3). In the D-RAM, the ASIC controls
various adjustment values, total ink consumption, and current ink
consumption for each color. When the printer is turned off, the data and
adjustment values accumulated in the D-RAM are written back to the
EEPROM under the ASIC's control. Information is transmitted between
the ASIC (IC3) and the EEPROM in serial data format.
EEPROM
Figure 2-24. EEPROM Control Circuit Block Diagram
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