Paper Feeding; Step-Motor Specification; Excitation Sequence; Control Circuit - ELCOM Euro-500 Handy Series Service Manual

Euro-500TX Handy

3.3 Paper feeding

The step-motor that feed the paper tape into the printer is a part of the printer itself. One motor control signal
pulse feeds the paper by 0.125 mm (corresponds to one dot).

3.3.1 Step-motor specification

Item
Type
Number of phases
Control method
Excitation type
Winding resistance/phase
Insulation class
Leads
Voltage
Maximum consumption current
Average consumption current
Control frequency

3.3.2 Excitation sequence

Sequence
Step 1
Step 2
Step 3
Step 4

3.3.3 Control circuit

Fig. 3.5 Control circuit

Service manual

Tab. 3.2 Step-motor specification

Signal name
A B
Low Low
Low High
High High
High Low

Tab. 3.3 Excitation sequence signals

One dot row
H
F1
L
H
F2
L
H
F3
L
H
F4
L

Fig. 3.4 Performance signals of the step-motor

CPU
Specification
PM type stepping motor
4
Bipolar drive
2-2 phase excitation
130 W ±7% / phase
Class E (Except for leads)
UL1685 AWG28
DC 24 V
approx. 0,4 A (at 26,4 V)
approx. 0,14 A (at 24 V)
900 pps
A
High
High
Low
Low
R55
EN GND
10k
U17
EN
1 16
1,2EN VCC1
9 8
3,4EN VCC2
AN
2 3
1A 1Y
A
7 6
2A 2Y
BN
10 11
3A 3Y
B
15 14
4A 4Y
4 13
GND GND
5 12
GND GND
L293D
© Elcom, s. r. o.
B
High
Low
Low
High
VCC1
VH
PA1 N
PA2
PB1N
PB2
29