Epson Stylus Color 760, Руководство по обслуживанию

Страница: 50 / 172

EPSON Stylus COLOR 760 Revision C
Operating Principles Electrical Circuit Operating Principles 50
2.2.2.5 EEPROM Control Circuit
Since EEPROM is nonvolatile memory, it keeps written information 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
CS: Chip selection signal
n
CK: Data synchronism clock pulse
n
DI: Data writing line (serial data) at power off.
n
DO: Data reading line (serial data) at power on.
The EEPROM control circuit is as shown below:
Figure 2-25. EEPROM Circuit Diagram
The detailed map of the EEPROM is provided in Chapter 7 Appendix.
+ 5 V
8
6
5
9 3 C 5 6
( I C 7 )
V c c
G N D
O R G
E 0 5 B 7 0 C D
( I C 8 )
2 0 6
2 0 5
2 0 4
2 0 3
1
2
3
4
C S
S K
D I
D O
E E C S
E E C K
E E C O
E E C I