Ribbon Motor Controller/Driver Circuit - Epson DLQ-3000 Service Manual

2.3.4 Ribbon Motor Controller/Driver Circuit

A PM-type stepping motor is used for the ribbon motor of this printer. It is driven by 1-1
phase or 2-2 phase excitation mode, based on the selected rotational speed. This motor
rotates in the both forward and backward directions and can stop at any position. Signal
PFA, /PFA, PFB and /PFB are output to drive each phase from the gate array (E05B46) via
the transistor array MP5302. Common voltage change signal (RF_R/H : Run/Hold) is output
from a port of the same gate array. To hold, both faces are driven simultaneously using the
5 VDC line. To switch between Run and Hold is operated by the signals RF_R/H output
from the gate array. While in the color ribbon mode, the printer switches mode between the
copy mode and normal mode according to the signal output from the paper thickness
sensor. See Table 2-11 for the ribbon motor drive term.
Motor type
Power supply voltage
Coil resistance
Drive frequency
Excitation mode
Consumption current
(mA/motor)
Drive mode
Figure 2-15. Ribbon Motor Driver circuit Block Diagram
Rev. A
Table 2-11. Ribbon Motor Drive Term
4 phases / 48-pole / PM-type stepping motor
35 VDC 10%
76 10% (at 25°C per phase)
At color select:460, 600 pps
At ribbon feed:320, 640, 770 pps
At color select:2-2 phase
At ribbon feed:2-2, 1-1 phase
1-fold speed (fabric ribbon):350 - 390
At color select
Copy mode:
Normal mode: 400 or less
Constant current uni-polar drive (VPB line)
Operating Principles
550 or less
2-21