Cr Motor Driver Circuit; Pf Motor Driver Circuit - Epson Stylus Photo 895 Service Manual

EPSON Stylus PHOTO 895/785EPX

2.2.2.3 CR Motor Driver Circuit

The motor driver IC on the MAIN board drives CR motor. This product uses 4-phase
200-pole hybrid type stepping motor and performs constant current bi-polar drive.
CPU (IC2) converts CR motor phase control signal to LB1946 micro step drive form
and outputs to motor driver IC (IC9) LB1946 from the each port. Based on this signal,
IC9 determines the phase mode.
The current value on each phase is determined by CPU (IC2) and outputs from the each
port to driver IC (IC9). Motor driver IC generates motor driver waveform based on
these input signals and controls the motor. If the printer dose not receive any data from
PC for 5 minutes, CPU set the motor drive current to 0 via the each port and the motor
drive is turned off to save the power consumption.
E01A22CA
(IC2)
17
CR_SCLK
18
CR_DATA
19
CR_LAT
4
C-P46
27
C-P25
+5V
Figure 2-21. CR Motor Driver Circuit Block Diagram
Operating Principles
LB1946
(IC9)
23
7 1
CLK OUTA
22
5 3
DATA OUTA-
21
CN13
SET
9 2
OUTB
27
VREF1
8 4
OUTB-
16
VREF2
14
+42V
VBB
24 1
MD VBB
25
+5V
CR1
28
18
VCC
CR2
2
3
E1 NC
4
12
E2 NC
5
20
ST NC
15 10
GND NC
17
11
NC
NC
19
NC 13
NC
26
NC
Electrical Circuit Operating Principles

2.2.2.4 PF Motor Driver Circuit

The motor driver IC on the MAIN board drives PF motor. This product uses 4-phase
200-pole hybrid type stepping motor and performs constant current bi-polar drive.
CPU (IC2) converts PF motor phase control signal to LB1946 micro step drive form
and outputs to motor driver IC (IC11) LB1946. Based on this signal, IC11 determines
the phase mode.
The current value on each phase is determined by CPU (IC2) and outputs from the each
port to driver IC (IC11). Motor driver IC generates motor driver waveform based on
these input signals and controls the motor. If the printer dose not receive any data from
PC for 5 minutes, CPU set the motor drive current to 0 via the each port 104 and the
motor drive is turned off to save the power consumption.
E01A22CA
(IC2)
24
PF_SCLK
25
PF_DATA
26
PF_LAT
Rotor
27
C_P25
+3.3V
+5V
Figure 2-22. PF Motor Driver Circuit Block Diagram
Revision A
LB1946
(IC11)
23
1
7
CLK
OUTA
22
3
DATA 5
OUTA-
21
CN12
SET
2
9
27 OUTB
VREF1
4
8
OUTB-
15
VREF2
14 +42V
VBB
24
1
MD
VBB
25
+5V
CR1
28
18
VCC
CR2
3 2
E1
NC
12 4
E2
NC
20 5
ST
NC
15
10
GND
NC
17
11
NC
NC
19
NC 13
NC
26
NC
Rotor
50