Table 2-6. Carriage Motor Drive Modes - Epson Stylus 800 Service Manual

Stylus 800+ service Manual
2.3.2.4 Carriage Motor Drive Circuit
The SLA7024 carriage motor drive IC (IC13) drives the carriage motor for the printer mechanism
using a constant current, unipolar drive system. Gate array E05BO0 (IC3) selects the motor phase
drive current level using the output signals from ports CRO to CR3 (pins 75 to 78). The phase
switching operation is directly controlled by the phase control signals output from ports P600 to
Drive
CR Speed
Frequency
250 6000
165 3960
63 2000
40
HOLD
CPU
(ICI) 2
3
4
78
77
76
75
Figure 2-20. Carriage Motor Drive Circuit Biock Diagram
Rev. A

Table 2-6. Carriage Motor Drive Modes

Phase
Excitation
1-2 phaee
1-2 phaae
1-2 phaae
960
1-2 phaae
—
2-2 phase
R59 R223
R224
I
R33
R34
R35
R36
Acceleration
Current
(A/Phase)
0.60
0.60
0.60
0.60
Approximately 0.15
7
'
5
IN-A
8
"
1
18
B
11
RFA
-B
RFB
I
-
current
0.30/0.60
0. SWO.60
0. WO.60
CR
Motor
CR-A
CR-B
2-15