SII LTP02-245-01 Use and care manual
LTP02-245-01
THERMAL PRINTER MECHANISM
TECHNICAL REFERENCE
U00128436600
LTP02-245-01 THERMAL PRINTER MECHANISM TECHNICAL REFERENCE
U00128436600 August 2012
Copyright © 2012 by Seiko Instruments Inc.
All rights reserved.
Seiko Instruments Inc. (hereinafter referred to as "SII") has prepared this technical reference for use by SII
personnel, licensees, and customers. The information contained herein is the property of SII and shall not be
reproduced in whole or in part without the prior written approval of SII.
SII reserves the right to make changes without notice to the specifications and materials contained herein and
shall not be responsible for any damages (including consequential) caused by reliance on the materials
presented, including but not limited to typographical, arithmetic, or listing errors.
is a trademark of Seiko Instruments Inc.
PREFACE
This technical reference describes the specifications and basic operating procedures for the LTP02-245-01
thermal printer mechanism (hereinafter referred to as "printer").
"CHAPTER 1 PRECAUTIONS" describes safety, design, and handling precautions. Read it thoroughly before
designing so that you are able to use the product properly.
SII has not investigated the intellectual property rights of the sample circuits included in this technical
reference. Fully investigate the intellectual property rights of these circuits before using.
The printer complies with EU RoHS Directive (2002/95/EC)
The printer contains "Pb", the details are described below.
Printer mechanism：a particular copper alloy parts, a particular free-cutting steel parts,
a particular component in glass of the electronic parts
*Lead-containing items listed above are exempt from EU RoHS (2002/95/EC).
Identifying the parts of the printer as follows.
Platen unit
Platen
Platen gear
Thermal head
Printer main body
Motor
Out of paper sensor
Connecting terminal
Printer mechanism
PREFACE-1
TOC-1
TABLE OF CONTENTS
CHAPTER1 PRECAUTIONS 1-1
1.1 SAFETY PRECAUTIONS ...................................................1-2
1.2 DESIGN AND HANDLING PRECAUTIONS ......................................1-3
1.2.1 Design Precautions ...............................................1-3
1.2.2 Handling Precautions .............................................1-5
1.2.3 Precautions on Discarding ........................................1-6
CHAPTER2 FEATURES 2-1
CHAPTER3 SPECIFICATIONS 3-1
3.1 GENERAL SPECIFICATIONS ...............................................3-1
3.2 PRINT CONFIGURATION ..................................................3-3
3.3 STEP MOTOR ...........................................................3-4
3.3.1 General Specifications ...........................................3-4
3.3.2 Sample Drive Circuit .............................................3-5
3.3.3 Excitation Sequence ..............................................3-6
3.3.4 Motor Start/Stop Method ..........................................3-7
3.3.5 Motor Drive Method ...............................................3-8
3.3.6 Motor Drive Precautions .........................................3-14
3.4 THERMAL HEAD ........................................................3-15
3.4.1 Structure of the Thermal Head ...................................3-15
3.4.2 Print Position of the Data ......................................3-16
3.4.3 Electrical Characteristics of Thermal Head ......................3-17
3.4.4 Timing Chart ....................................................3-18
3.4.5 Thermal Head Heat Element Resistance ............................3-18
3.4.6 Maximum Current Consumption .....................................3-19
3.5 CONTROLLING THE ACTIVATION PULSE WIDTH FOR THERMAL HEAD .............3-20
3.5.1 Calculation of Activation Pulse Width ...........................3-20
3.5.2 Calculation of Printing Energy ..................................3-20
3.5.3 Adjustment of Thermal Head Resistance ...........................3-21
3.5.4 Adjustment of Thermal Head Drive Voltage ........................3-21
3.5.5 Setting of Activation Pause Time ................................3-21
3.5.6 Adjustment by Thermal Head Activation Pulse Cycle ...............3-22
3.5.7 Calculation Sample for the Activation Pulse Width ...............3-23
3.5.8 Temperature Characteristics of Thermistor .......................3-24
3.5.9 Detecting Abnormal Temperature of the Thermal Head ..............3-26
3.6 OUT-OF-PAPER SENSOR .................................................3-27
3.6.1 Precautions for the Out-of-Paper Sensor .........................3-27
TOC-2
CHAPTER4 CONNECTING TERMINALS 4-1
4.1 RECOMMENDED CONNECTOR FOR EXTERNAL CIRCUITS ..........................4-1
4.2 CONNECTING TERMINALS .................................................4-1
CHAPTER5 PRINT DRIVE METHOD 5-1
5.1 MOTOR AND THERMAL HEAD DRIVE METHOD ..................................5-1
5.2 THERMAL HEAD DIVISION DRIVE METHOD ...................................5-3
5.3 PRECAUTIONS FOR PRINT DRIVE ..........................................5-4
CHAPTER6 OUTER CASE DESIGN GUIDE 6-1
6.1 FIXING THE PRINTER MAIN BODY .........................................6-1
6.1.1 How to Mount the Printer Main Body ...............................6-1
6.1.2 Recommended Screws ...............................................6-2
6.1.3 Precautions for Fixing the Printer Main Body .....................6-2
6.2 FIXING THE PLATEN UNIT ...............................................6-3
6.2.1 Recommended Shape of the Platen Holder ...........................6-3
6.2.2 Dimensions for Positioning and Fixing the Platen Holder ..........6-4
6.2.3 Precautions for Fixing the Platen Holder .........................6-5
6.3 CONNECT THE PRINTER TO FRAME GROUND (FG) .............................6-6
6.3.1 How to Connect the Printer to Frame Ground (FG) ..................6-6
6.4 LAYOUT OF THE PRINTER MECHANISM AND THERMAL PAPER ....................6-7
6.5 WHERE TO MOUNT THE PAPER HOLDER ......................................6-8
6.6 DESIGN PAPER EJECT ...................................................6-9
6.6.1 Design the Shape of the Paper Eject ..............................6-9
6.6.2 Mount the Paper Cutter ..........................................6-10
6.7 PRECAUTIONS FOR DESIGNING THE OUTER CASE ............................6-11
CHAPTER7 EXTERNAL DIMENSIONS 7-1
CHAPTER8 HANDLING METHOD 8-1
8.1 PRECAUTIONS FOR INSTALLING/UNINSTALLING THE THERMAL PAPER ............8-1
8.2 PRECAUTIONS FOR CLEANING THE THERMAL HEAD ............................8-2
TOC-3
TABLES
Table 3-1 General Specifications .......................................... 3-1
Table 3-2 General Specifications of the Step Motor ........................ 3-4
Table 3-3 Excitation Sequence ............................................. 3-6
Table 3-4 Maximum Motor Drive Pulse Rate .................................. 3-8
Table 3-5 Acceleration Steps ............................................. 3-10
Table 3-6 Maximum Continuous Drive Time and Drive Ratio .................. 3-11
Table 3-7 Drive Time and Paper Length at Temperature Rise 50°C ........... 3-12
Table 3-8 Drive Time and Paper Length at Temperature Rise 75°C ........... 3-13
Table 3-9 DST Terminals and Heating Elements ............................. 3-15
Table 3-10 Electrical Characteristics of Thermal Head ..................... 3-17
Table 3-11 Thermal Head Heat Element Resistance ........................... 3-18
Table 3-12 Standard Printing Energy and Temperature Coefficient ........... 3-20
Table 3-13 Activation Pulse Width ......................................... 3-23
Table 3-14 Temperature Characteristics of the Thermistor .................. 3-25
Table 3-15 Out-of-paper Sensor ............................................ 3-27
Table 4-1 Recommended Connectors .......................................... 4-1
Table 4-2 Terminal Assignments of the Connecting Terminal ................. 4-2
TOC-4
FIGURES
Figure 3-1 Print Dot Pitch ................................................3-3
Figure 3-2 Print Area .....................................................3-3
Figure 3-3 Sample Drive Circuit ...........................................3-5
Figure 3-4 Input Voltage Waveforms for the Sample Drive Circuit ...........3-6
Figure 3-5 Motor Start/Stop Timing Chart ..................................3-7
Figure 3-6 Thermal Head Block Diagram ....................................3-15
Figure 3-7 Transfer Data and Print Position ..............................3-16
Figure 3-8 Thermal Head Drive Timing Chart ...............................3-18
Figure 3-9 the Time Between the Beginning of the Last Thermal Head Activation
and the Beginning of Present Thermal Head Activation (W') .....3-22
Figure 3-10 Temperature Characteristics of the Thermistor .................3-24
Figure 3-11 Sample External Circuit of the Out-of-paper Sensor ............3-27
Figure 4-1 Connecting Terminals ...........................................4-1
Figure 5-1 Divided Print Timing Chart Sample ..............................5-1
Figure 6-1 Dimensions for Positioning and Fixing the Printer Main Body ....6-1
Figure 6-2 Dimensions for Positioning and Fixing the Platen Unit ..........6-3
Figure 6-3 Dimensions for Positioning and Fixing the Platen Holder ........6-4
Figure 6-4 Frame Ground (FG) Connecting Area ..............................6-6
Figure 6-5 Recommended Layout between the Printer and the Paper ...........6-7
Figure 6-6 Recommended Paper Holder Dimensions ............................6-8
Figure 6-7 Paper Path .....................................................6-9
Figure 6-8 Blade Edge ....................................................6-10
Figure 7-1 External Dimensions of the Platen Unit .........................7-2
Figure 7-2 External Dimensions of the Printer Mechanism ...................7-3
Figure 8-1 Cleaning Position of the Thermal Head ..........................8-2
CHAPTER 1
PRECAUTIONS
Read through this technical reference to design a product and to operate the printer properly. Pay special
attention to the precautions noted in each section for details. Information contained in this technical reference
is subject to change without notice.
For the latest information, contact our sales representative.
Sufficient evaluation and confirmation should be performed with the designed outer case mounted, to ensure
proper use of the printer.
SII shall not be liable for any and all claims, actions, lawsuits, demands, costs, liabilities, losses, damages
and/or expenses that are caused by improper handling of the printer, any use not contained in this technical
reference or that result from the outer case, unless such damages and/or loss originate from the printer itself.
SII makes no warrant that your products into which built the sample circuits included in this technical
reference can work properly and safe. You shall evaluate and confirm sufficiently that such products can work
properly and safe, and shall be liable for any and all claims, actions, lawsuits, demands, costs, liabilities,
losses, damages and/or expenses arising out of or in relating to such products.
SII has not investigated the intellectual property rights of the sample circuits included in this technical
reference. Fully investigate the intellectual property rights of these circuits before using.
The printer is designed and manufactured to be mounted onto general electronic equipment. If high reliability
is required of the printer in respect to hazardous influences on the body or life and loss to property, redundant
design of the entire system should be carried out and verify the performance with your actual device before
commercialization. And our sales representative should be informed as such in advance.
Follow the precautions listed below when designing a product using the printer. Include any necessary
precautions into your operation manual to ensure safe operation of your product by users.
1-1
1.1 SAFETY PRECAUTIONS
Follow the precautions listed below when designing your product for using safely. Include any necessary
precautions into your operation manual and attach warning labels to your products to ensure safe operation.
Precautions to prevent the thermal head from overheating
When the thermal head heat elements are continuously activated by a CPU or other malfunction,
the thermal head may overheat and may cause smoke and fire. Follow the method described in
"3.5.9 Detecting Abnormal Temperature of the Thermal Head" to monitor the temperature of the
thermal head to prevent overheating. Turn the printer off immediately if any abnormal conditions
occur.
Precautions for rising temperatures of the thermal head
Temperature of the thermal head and its peripherals rises very high during and immediately after
printing. Be sure to design the outer case to prevent users from burn injuries by touching them.
Place warning labels to warn users to ensure safe operation. As for thermal head cleaning, warn
users to allow the thermal head to cool before cleaning. In order to allow cooling, secure clearance
between the thermal head and the outer case when designing the outer case.
Precautions for rising temperatures of the motor
Temperature of the motor and its peripherals rises very high during and immediately after printing.
Be sure to design the outer case to prevent users from burn injuries by touching them. Place
warning labels to warn users to ensure safe operation. In order to allow cooling, secure clearance
between the motor and the outer case when designing the outer case.
Precautions for sharp edges of the printer
The printer may have some sharp edges and cutting surfaces of the metal parts. Be sure to design
the outer case to prevent users from injuring himself/herself by touching the sharp edges and place
warning labels to warn users to ensure safe operation.
Precautions for motor drive
The hair may get caught in the exposed platen and the gears. Control the motor not to drive when
the outer case and the platen unit is in open state. Also, make sure to design the outer case so as
not to touch the platen and the gears and also prevent any objects from getting caught. Place
warning labels to warn users to ensure safe operation.
1-2
1.2 DESIGN AND HANDLING PRECAUTIONS
To maintain the primary performance of the printer and to prevent future problems from occurring, follow the
precautions below.
1.2.1 Design Precautions
Apply power in the following manner:
At power on : (1) Vdd →(2) VP
At shut down : (1) VP→(2) Vdd
A surge voltage between VPand GND should not exceed 10V.
For noise countermeasure, connect a 0.1μF capacitor between Vdd and GND pins near the
connector.
Make the wire resistance between the power supply (VPand GND) and the printer (connecting
terminals) as small as possible (below 50mΩ). Keep distance from signal lines to reduce electrical
interference.
The sensor may generate instantaneous abnormal signal. Design the firmware in order to prevent
malfunction due to the abnormal signal.
Keep the VPpower off during not printing in order to prevent the thermal head from electrolytic
corrosion. In addition, design the product so that the Signal Ground (GND) of the thermal head and
the Frame Ground (FG) of the printer become the same electric potential.
Use C-MOS IC chips for CLK, LAT , DI and DST signals of the thermal head.
When turning the power on or off, or during not printing, always disable the DST terminals.
To prevent the thermal head from being damaged by static electricity:
(1) Connect the printer Frame Ground (FG) connecting area to the Frame Ground (FG) of the outer
case. See "CHAPTER 6 OUTER CASE DESIGN GUIDE" for details.
(2) Connect the Signal Ground (GND) to the Frame Ground (FG) through approximately 1 MΩ
resistance.
Always detect the outputs of the platen position sensor and out-of-paper sensor. Never activate the
thermal head when there is no thermal paper. Incorrect activation of the thermal head may reduce
the life of the thermal head and the platen and may damage them.
A pause time between thermal head activations of the same heat element shall be secured more
than 0.5ms. Pay attention to when using one division printing or when a thermal head activation time
becomes longer. If activating for a long time without the pause time, the thermal head may become
damaged.
If too much energy is applied to the thermal head, it may overheat and become damaged. Always
use the printer with the specified amount of energy shown in "3.5 CONTROLLING THE
ACTIVATION PULSE WIDTH FOR THERMAL HEAD".
Operation sound and vibration during printing vary depending on the motor pulse rate. Verify the
performance with your actual device.
Paper feed force can be decreased depending on the motor pulse rate. Verify the performance with
your actual device.
Do not perform continuous printing to prevent the motor from overheating. Refer to "3.3.5 Motor
Drive Method" to set a pause time.
Paper feeding may be confused with several dot lines when printing is started from waiting status.
When printing and paper feeding are interrupted and then started printing, as this may cause the
paper feeding be confused. When printing bit images and so on, always feed the thermal paper for
more than 48 steps at start up and do not interrupt printing.
1-3
To prevent degradation in the print quality due to the backlash of the paper drive system, feed the
thermal paper for 48 steps or more at the initialization, at a time after setting/releasing the platen unit,
a time after feeding the thermal paper backward and a time after cutting with a paper cutter.
Surface of the thermal paper may get scratched by backward feed. The backward feed may cause
paper skew and jams depending on the paper roll layout and designing of the paper holder. Be
sure to confirm performance with your product before using the backward feed.
If printing at a high print ratio for longer length, non-printing area may be colored due to an
accumulation of heat. Verify the performance with your actual device.
Do not print without the thermal paper. It may cause damage the platen and the thermal head.
It is recommended that the platen holder is guided by part of the outer case, when the platen unit is
set into the printer main body. If you set the mounting part of the printer and rotation center part of
the platen holder to the same base, accuracy for setting or releasing the platen unit will improve.
Design the outer case that holds the platen holder so that the center of the platen unit of the printer
mechanism is pushed. When the edge of the platen unit is pushed, a one-sided lock phenomenon
happens, and print defect and/or a paper jam may occur. It is helpful to indicate which location has
to be pushed by showing a symbol on the outer case. Verify the performance with your actual
device.
If the printer main body and the platen unit are not placed in proper position, the print defect and the
paper jam may occur. Therefore, pay special attention to it when designing the outer case.
For the position relation between the printer main body and the platen unit, see "CHAPTER 6
OUTER CASE DESIGN GUIDE".
Design the platen holder and the outer case strong enough to keep the allowable dimensions
because stress is applied to them when setting and releasing the platen unit. The rotation center for
the rotation system of the platen holder should be designed to fit the rotational shaft into the shaft
hole so that the platen unit should be stable when it is in the close state.
Design the thermal paper supply system in accordance with "CHAPTER 6 OUTER CASE DESIGN
GUIDE". When the thermal paper supply position is improper, print difficulty or paper detection
difficulty will be caused and the surface of thermal paper may get scratched. Verify the performance
with your actual device.
Do not use labeling paper, 2-ply thermal paper, and thermal paper with thickness of 75μm or thicker.
Design the product so that a tension force is not applied to the FPC. The FPC could be moved by
setting/releasing the platen unit, so design the product so that the FPC has enough play after
connected it. The tension force may cause some print problems and may damage the FPC.
Metal parts may become discolored and rusted due to the operational environment. Consider these
factors regarding appearance.
Do not apply external force continuously toward the direction the platen unit is released. Otherwise,
it may cause slipping gears, negative influence on printing quality, and printing troubles during
operation.
1-4
1.2.2 Handling Precautions
Incorrect handling may reduce the efficiency of the printer and cause damage. Handle the printer with the
following precautions.
Also, include any necessary precautions so that users handle the printer with care.
Using anything other than the specified thermal paper does not guarantee print quality and life of the
thermal head.
The followings are examples of trouble:
(1) Poor printing quality due to low thermal sensitivity
(2) Abrasion of the thermal head due to paper surface roughness
(3) Printing stuck and unusual noise due to sticking the thermal layer of the thermal paper
to the thermal head
(4) Printing fade due to low preservability of the thermal paper
(5) Electrolytic corrosion of the thermal head due to inferior paper
After the printer has been left not in use for long period of time, the platen could be deformed and
resulted in print quality deteriorated. In this case, feed thermal paper for a while to recover
deformation of the platen. If the thermal head is remained in contact with the platen without thermal
paper for a long time, the platen and the thermal head may be stuck together and cause paper feed
difficulty. If facing this problem, release the platen unit, and set it back again before starting printing.
Never loosen the screws that fasten respective parts of the printer. Loosened screws may reduce
the efficiency of the performance of the printer mechanism.
Do not release the platen unit during printing; otherwise this may reduce the efficiency of the printer
and may cause damage.
Do not apply stress to the platen unit during printing. The print defect may occur.
When setting the platen unit, the reduction gear may interfere with the platen gear and may cause
the platen unit to not be set. In such a case, release the platen unit and set it again.
Never pull out the thermal paper while the platen unit is set. The printer mechanism may become
damaged.
When handling the printer, make sure to use antistatic clothing and to ground yourself to prevent the
thermal head from damaged by static electricity. Especially take care of the thermal head heat
element and the connecting terminal.
Do not hit or scratch the surface of the thermal head with any sharp or hard object. This could
damage the thermal head.
When printing at a high print ratio in a low temperature or high humidity environment, the vapor from
the thermal paper during printing may cause condensation to form on the printer and soil the thermal
paper itself. Prevent the thermal head from a drop of water. It may cause electrolytic corrosion of the
thermal head. If condensed, do not activate electricity until dried.
Connect or disconnect the connecting terminal after turn off the power.
Do not apply stress to the FPC while connecting and disconnecting them. Otherwise the FPC may
become damaged.
Warn users not to pull the thermal paper and not to change the paper eject angle during printing.
Otherwise, the print defect or the paper jam may occur.
In order to prevent the thermal head from damage and to avoid the print defect, warn users not to
touch the thermal head and the sensor directly when handling the printer like replacing thermal
paper.
Do not use the paper roll with glued end or folded end. In case of using such paper roll, replace to a
new one before the end of the paper roll is shown up.
1-5
1-6
The printer is not waterproof and drip proof. Prevent contact with water and do not operate with wet
hands as it may damage the printer or may cause a short circuit or fire.
The printer is not dust proof. Never use the printer in a dusty place, as it may damage the thermal
head and paper drive system.
Do not use the printer in corrosive gas and siloxane atmosphere as it may cause the contact failure.
1.2.3 Precautions on Discarding
When discarding used printers, discard them according to the disposal regulations and rules of each
respective district.
2-1
CHAPTER 2
FEATURES
The printer is a compact printer that adopts a thermal line dot printing method. It can be used with measuring
instruments and analyzer, a POS, a communication terminal device, or a data terminal device.
The printer has the following features:
High resolution printing
A high-density print head of 8 dots/mm produces clear and precise printing.
Compact
Dimensions : W67.3mm × D18.1mm × H30.0mm
Mass : approx. 28 g
High print speed*
Maximum 90mm/s print is available.
Easy operation
Platen unit open mechanism provides easy paper installation.
Maintenance Free
No cleaning and no maintenance required.
Low noise
Thermal printing technology realizes low-noise print.
* Print speed differs depending on working conditions.
CHAPTER 3
SPECIFICATIONS
3.1 GENERAL SPECIFICATIONS
Table 3-1 lists the general specifications of the printer.
Table 3-1 General Specifications
(1/2)
Items Specifications
Printing method Thermal line dot printing method
Total dots per line 384 dots
Printable dots per line 384 dots
Simultaneously activated dots 45 dots
Resolution W 8 dots/mm × H 16 dots/mm*1
Paper feed pitch 0.03125 mm
Maximum print speed 90 mm/s*2
Print width 48 mm
Paper width mm58 0
1
Thermal head temperature detection Thermistor
Platen position detection None
Out-of-paper detection Reflection type photo interrupter
Operating voltage range
V
Pline
V
dd line
5.5 V to 8.0 V
3.0 V to 3.6 V
Current consumption
line Thermal head drive
Motor drive
VP
Vdd line Thermal head logic
2.23 A max. (at 8.0 V)*3
0.60 A max.
0.10 A max.
3-1
(2/2)
Items Specifications
Operating temperature range -10°C to 50°C (Non condensing)
Operating humidity range
Temperature(℃）
Relative Humidity（%RH）
50℃52%RH
45℃64%RH
40℃85%RH
0 10 20 30 40 50
100
90
80
70
60
50
40
30
20
10
0
Storage temperature range -20°C to 60°C (Non condensing)
Activation pulse
resistance 100 million pulses or more*4
Life span
(at 25°C and
rated energy) Abrasion
resistance 50 km or more*5
Paper feed force 0.49 N (50 gf) or more
Paper hold force 0.78 N (80 gf) or more
Dimensions
(excluding convex part) W 67.3 mm × D 18.1 mm × H 30.0 mm
Mass Approx. 28g
Specified thermal paper
Nippon Paper
Jujo Thermal
Mitsubishi Hi-Tech Paper
Papierfabrik August Koehler AG
TF50KS-E2D
AF50KS-E
F5041
KT55F20
*1 : See "CHAPTER 5 PRINT DRIVE METHOD" for printing drive method.
*2 : Print speed changes according to the processing speed of the controller and print pulse width.
*3 : The value when the number of simultaneously activated dots is 45 dots.
*4 : Excluded when the same dots are printed continuously.
*5 : Excluding damage caused by dust and foreign materials.
3-2
3.3 STEP MOTOR
3.3.1 General Specifications
Table 3-2 shows general specifications of the step motor.
Table 3-2 General Specifications of the Step Motor
Item Specifications
Type PM type step motor
Drive method Bipolar chopper drive
Excitation 1-2 phase
Winding resistance per phase 8.3 /phase 10%
Motor drive voltage VP: 5.5 V to 8.0 V
Motor controlled current 300 mA/phase
Drive pulse rate 2933 pps max.
3-4
3.3.2 Sample Drive Circuit
Figure 3-3 shows a sample drive circuit.
3-5
PH1
PH2
PH3
PH4
Vcc VMM
EMO VM
PS
NC
VREF REG5
REG1
IN1A OUT1A
IN1B OUT1B
IN2A OUT2A
IN2B OUT2B
ATT2
ATT1 RNF1
RNF2
CHOP
GND PGND
16
22
+
10F
35V
Vp
13
20
18
23
14
24
6
1
Vdd
1
19
9
10
21
220pF
8
A
B
A
B
0.1F
12 15
1.33±1%
0.1F
4
5
11
2
3
17
1.33±1%
1.33±1%
1.33±1%
MCL
*: Recommended motor driver : LV8711T (SANYO)
Figure 3-3 Sample Drive Circuit
3.3.3 Excitation Sequence
Drive the motor with 1-2 phase excitation. One step of the motor drive signal feeds the paper 0.03125 mm.
One dot line is consisted of 4 steps. When the voltage signal shown in Figure 3-4 is input to the motor drive
circuit shown in Figure 3-3, the printer feeds the paper in the normal direction when the motor is excited in
order of step 1, step 2, step 3, step 4, step 5, step 6, step7, step 8, step 1, step 2, . . . . , as shown in Table
3-3.
START
STEP
1st
STEP
2nd
STEP
3rd
STEP
4th
STEP
5th
STEP
6th
STEP
7th
STEP
8th
STEP
PH1
H
L
PH2
H
L
PH3
H
L
PH4
H
L
1 dotline
*1: Set MCL to "High" while the motor is driven.
Figure 3-4 Input Voltage Waveforms for the Sample Drive Circuit
Table 3-3 Excitation Sequence
Input Signal Output Signal
PH1 PH2 PH3 PH4 A /A B /B
Step1 H L L L H L OFF OFF
Step2 H L L H H L L H
Step3 L L L H OFF OFF L H
Step4 L H L H L H L H
Step5 L H L L L H OFF OFF
Step6 L H H L L H H L
Step7 L L H L OFF OFF H L
Step8 H L H L H L H L
3-6
Table of contents
