Asf/Pump Motor Driver Circuit; Eeprom Control Circuit - Epson Stylus COLOR 1160 Service Manual

EPSON Stylus COLOR 860/1160

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
Operating Principles

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.
n
n
n
n
The EEPROM control circuit is as shown below:
Electrical Circuit Operating Principles
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.
Figure 2-25. EEPROM Circuit Block Diagram
Revision C
50