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

DLQ-3000+

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)
Figure 2-16. PF Motor Drive Circuit Block Diagram
2-22
Table 2-12. PF Motor Drive Term
4 phases / 200-pole / HB-type stepping motor
35 VDC 10%
5.0 10%
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):
1.3 A/phase
0.35 A/phase
Rev. A