Epson DLQ-3000+, Service Manual

Page: 83 / 262

Operating Principles
Rev. A
2-21
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.
Table 2-12. PF Motor Drive Term
Motor type 4 phases / 200-pole / HB-type stepping motor
Power supply voltage
35 VDC 10%
Coil resistance
5.0 10%
Drive frequency
1430 7200 pps
Driving mode Constant current uni-polar drive
Excitation mode 1-2 phase/2-2 phase (RUSH/HOLD)
Paper feed speed 42 m second (6 IPS intermittent drive)
Minimum step 0.07 mm (1/360”)/step
Consumption current
(mA/motor) 6 IPS (1-2 phase): 1.3 A/phase
HOLD (2-2 phase): 0.35 A/phase
PFIO
PF A
PF B
INA
IN-A
INB
IN-B
PF A
PF_A
PF B
PF_B
PF COM
A
_A
B
_B
VPB(+35V)
VSA
VSB
GP
+
GP
+5V
GP
PFA
PFB
RSB
RSA
GND A
GND B
+5V
/TDA
/TDB
PF_A
PF_B
VPB(+35V)
Gate Array
Motor Drive IC
E05B46
SLA7024M(IC6)
Figure 2-16. PF Motor Drive Circuit Block Diagram