Cr (Carriage) Motor Controller/Driver Circuit - Epson DLQ-3000 Service Manual

2.3.6 CR (Carriage) Motor Controller/Driver Circuit

The CR motor for this printer is a hybrid-type stepping motor, which enables the CR to move
to and stop at any position exactly, using both forward and backward rotation. It is
controlled by the open-loop system and driven by 1-2 phase, 2-2 phase or W1-2 phase (for
micro step), depending on the CR speed. This motor is controlled by the signals for 4
phases (PFA, /PFA, PFB and /PFB) output from the gate array E05B46 (IC25) via the drive
IC SLA7026M (IC7). The motor is also controlled by W1-2 phase for micro step. In this
mode, the micro step current set signals (/CASA1, 2 and CASA 1, 2) are output to divide
each set current for phase A and B into 4 steps with the range of 0 to 100 %. These 4 steps
are divided further into 8 steps, which varies depending on the combination with the
continuity timing.
Motor type
Power supply voltage
Coil resistance
Drive frequency
Consumption current
Excitation mode
Note) Drive frequency and excitation mode vary with print speed.
Figure 2-17. CR Motor Drive Circuit Block Diagram
Rev. A
Table 2-13. CR Motor Specification
4 phases/200-pole/HB-type stepping motor
35 VDC 10% (31.5
1.1 10% (at 25°C/phase)
960 to 5760 pps
2-2 phase, 4-fold speed:
1-2 phase, 2/3-fold speed:
W1-2 phase, 1-fold speed:
1-2 phase/2-2 phase/W1-2 phase drive
Operating Principles
38.5 VDC)
2.5 A/phase
2.0A/ phase
1.5A/ phase
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