Epson Stylus Color 880, Service Manual, Page: 52 / 179

EPSON Stylus COLOR 880 Revision A
Operating Principles Electrical Circuit Operating Principles 52
2.2.2.5 ASF/Pump Motor Driver Circuit
The block diagram for the ASF/Pump motor is as shown below:
Figure 2-24. ASF/Pump Motor Circuit Block Diagram
2.2.2.6 EEPROM Control Circuit
Since EEPROM is nonvolatile memory, it keeps information written if the
printer power is turned off. Information stored in EEPROM is various
adjustment values, factory values, and printer status values. See Appendix for
EEPROM Address Map that provides detailed information on the values stored
in EEPROM.
EEPROM is connected to ASIC with 4 lines and each line has the following
function.
„
CS: Chip selection signal
„
CK: Data synchronism clock pulse
„
DI: Data writing line (serial data) at power off.
„
DO: Data reading line (serial data) at power on.
The EEPROM control circuit is as shown below:
Figure 2-25. EEPROM Circuit Block Diagram