Epson Stylus Color 1160 - Asf;Pump Motor Driver Circuit; EEPROM Control Circuit

EPSON Stylus COLOR 860/1160 Revision C
Operating Principles Electrical Circuit Operating Principles 50
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.
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 Block Diagram
IC 1 2
LB11847
+42V
OUTA
OUTA
OUTB
OUTB
ASF-A
ASF-A
ASF-B
ASF-B
+42
C79
100U
C75
0.1U
VBB
C69
0.1U
VCC
GND
PHASE1
PHASE2
ENABLE1
ENABLE2
SW A2
CN6
ASF SENSO R
PFPHAA
PFPHAB
PFENBA
PFENBB
DA0
-
+
IC 2 2
SN 104B 00P S R
VREF1
VREF2
DATA Bus
Current control signals
IC 8
E05B70CD
IC 1 5
C90A13CA
+5V
8
6
5
93C 56
(IC 7 )
Vcc
GND
ORG
E05B 70C D
(IC 8 )
206
205
204
203
1
2
3
4
CS
SK
DI
DO
EECS
EECK
EECO
EECI