Pf (Paper Feed) Motor Controller/Driver Circuit - Epson DLQ-3000+ Service Manual

2.3.5 PF (Paper Feed) Motor Controller/Driver Circuit

Since this printer uses a hybrid-type stepping motor for the PF motor, it allows the paper to
move to and stop at any position, regardless of the direction for feeding paper. The motor is
driven by 1-2 phase with the open-loop system. Signals for 4 phases (PFA, /PFA, PFB and
/PFB) are output from the gate array E05B46 (IC25) driven by the motor drive IC SLA7024M
(IC6). To hold the motor, 2-2 phase is driven by the hold signal (PFIO) output from the same
gate array. See Table 2-12 which specifies the PF motor terms.
Motor type
Power supply voltage
Coil resistance
Drive frequency
Driving mode
Excitation mode
Paper feed speed
Minimum step
Consumption current
(mA/motor)
Gate Array
E05B46
PF A
PF_A
PF B
PF_B
PFIO
Figure 2-16. PF Motor Drive Circuit Block Diagram
Rev. A
Table 2-12. PF Motor Drive Term
4 phases / 200-pole / HB-type stepping motor
35 VDC


5.0

1430 7200 pps
Constant current uni-polar drive
1-2 phase/2-2 phase (RUSH/HOLD)
42 m second (6 IPS intermittent drive)
0.07 mm (1/360")/step
6 IPS (1-2 phase):
HOLD (2-2 phase):
VPB(+35V)
+
+5V
GP
GP

10%
10%
1.3 A/phase
0.35 A/phase
Motor Drive IC
SLA7024M(IC6)
VPB(+35V)
A
INA
_A
IN-A
B
INB
_B
IN-B
VSA
+5V
VSB
/TDA
PFA
/TDB
PFB
RSB
RSA
GND A
GND B
Operating Principles
PF COM
PF A
PF_A
PF B
PF_B
GP
2-21