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CUSTOM ENGINEERING SPA and other entities utilized in the realization of this manual bear no responsibility
for how the manual is used.
Information regarding any errors found in it or suggestions on how it could be improved are appreciated. Since
products are subject to continuous check and improvement, CUSTOM ENGINEERING SPA reserves the right
to make changes in information contained in this manual without prior notifi cation.
1.1 General safety information ............................................................................................................................... 5
1.2 General features ............................................................................................................................................... 5
1.3 Print head speci cations .................................................................................................................................. 5
2 INSTALLATION AND USE .......................................................................................................................................7
2.1 Front exterior view of MT558 ............................................................................................................................ 7
2.2 Front exterior view of MT558-0101 (model with at cable) .............................................................................. 8
3.1.4 Electrical circuit block diagrams of motor and paper-end sensor ................................................................ 11
4 PRINT HEAD ..........................................................................................................................................................13
4.2 Block diagram of the electrical circuit of MT558 model .................................................................................. 14
4.3 Block diagram of the electrical circuit of MT558-0101 model ......................................................................... 15
4.4 Printing data and printing position .................................................................................................................. 16
4.5 Electrical characteristics of circuit .................................................................................................................. 16
4.6 Switching characteristics of circuit .................................................................................................................. 17
4.7 Timing chart of MT558 model ......................................................................................................................... 17
4.8 Timing chart of MT558-0101 model ................................................................................................................ 18
5 STEPPER MOTOR ................................................................................................................................................ 21
5.1 Technical speci cations .................................................................................................................................. 21
7.1 DIMENSIONS OF MT558 MODEL ................................................................................................................. 29
7.2 DIMENSIONS OF MT558-0101 ..................................................................................................................... 30
User Manual MT558 3
Page 4
TABLE OF CONTENTS
4 MT558 User Manual
Page 5
1. INTRODUCTION
1 INTRODUCTION
1.1 General safety information
• Read and keep the instructions which follow.
• Follow all warnings and instructions indicated.
• Before cleaning the mechanism, disconnect the power supply.
• Clean the mechanism with a damp cloth. Do not use liquid or spray products.
• Do not operate the mechanism near water.
• Do not use the mechanism on unstable surfaces that might cause it to fall and be seriously damaged.
• During the integration of the printer, we strongly warn to keep an adeguate paper loop outlet underneath the
presenter, in order to allow the receipt being properly printed out.
• Only use the mechanism on hard surfaces and in environments that guarantee proper ventilation.
• Make sure the mechanism is placed in such a way as to avoid damage to its wiring.
• Use the type of electrical power supply indicated. If in doubt, contact your retailer.
• Do not introduce foreign objects of any kind into the mechanism as this could cause a short circuit or damage
parts that could jeopardize mechanism functioning.
• Do not spill liquids onto the mechanism.
• Do not carry out technical operations on the mechanism, with the exception of the scheduled maintenance procedures specifi cally indicated in the user manual.
1.2 General features
PAPER WIDTH58 mm
RESOLUTIONS8 dot/mm (203dpi)
PRINTING SPEED65 mm/sec.
LOGIC VOLTAGE5V
SENSORSPaper end, head up detection, temperature thermistor 30K
LIFE50 Km printed paper
AUTOLOADING CAPABILITY
COMPACT LAYOUT
HIGH TORQUE PAPER-PULLING MOTOR
SILICON RUBBER PAPER FEEDING ROLL
1.3 Print head specifi cations
PRINTING METHODThermal line dot method
EFFECTIVE PRINTING WIDTH48 mm
HEAD CONFIGURATION (DOTS/LINE)384
DOT PITCH0,125 mm
PRINTING SPEED (see power consumption and energy dots)65 mm/sec
MAXIMUM NUMBER OF DOTS ACTIVATED AT A TIME192
DOT RESISTANCE (RAV)120
User Manual MT558 5
Page 6
1. INTRODUCTION
NUMBER OF STROBES6
HEATER ENERGY
5°C0,27 mJ/dot (1,8 ms)
25°C0,21 mJ/dot (1,4 ms)
45°C0,18 mJ/dot (1,2 ms)
DRIVER SATURATED RESISTANCE (RIC)13
EXTERNAL DIMENSIONS (W x D x H)84,55 x 44,25 x 20
WEIGHT72 gr
OPERATION VOLTAGE RANGE LOGIC7 V
OPERATION VOLTAGE DOTLINE HEAD5 V
CURRENT CONSUMPTIONPrinting at 5Vcc :
1,9 A (Head with 64 dots on made simultaneously)•
420 mA Stepper motor•
48 mA Logic current•
ABSORPTION
Average (100% dots on) 2,4 A•
Peak (100% dots on) 3,2 A•
LIFE / REABILITY50 Km 1 x 10
RECOMMENDED PAPER WEIGTH55 g/m
2
RECOMMENDED PAPERKF-50HDA or equivalent
HEAD VOLTAGEV
SUPPLY VOLTAGEV
= 8,5 V
H
= 3 ÷ 5,5 V
DD
SUBSTRATE TEMPERATURE65 °C
ENVIRONMENT OPERATING TEMPERATURE RANGE5 ÷ 50°C
OPERATING HUMIDITY10 ÷ 90 % RH no condensation
ENVIRONMENT STORAGE TEMPERATURE (EXCEPT PAPER)-25 ÷ 70 °C
8
pulse
6 MT558 User Manual
Page 7
2 INSTALLATION AND USE
2.1 Front exterior view of MT558
2. INSTALLATION AND USE
Motor1.
Print Head2.
Head up lever3.
Sensor Head up detection4.
Print Head cable5.
Knob paper feed6.
A- Paper outfeed
B- Paper input
C- Paper end sensor
2
1
6
3
4
5
C
A
B
User Manual MT558 7
Page 8
2. INSTALLATION AND USE
2.2 Front exterior view of MT558-0101 (model with fl at cable)
Motor1.
Print Head2.
Head up lever3.
Sensor Head up detection4.
Print Head cable5.
Knob paper feed6.
A- Paper outfeed
B- Paper input
C- Paper end sensor
2
1
6
3
4
5
A
B
C
8 MT558 User Manual
Page 9
3. CONNECTIONS
3 CONNECTIONS
3.1 Connections terminals
The mechanism has two interface connectors (see following fi gure), that includes the thermal head connector and
motor-paper control connector.
1
Thermal head
connector
Motor-paper
control connector
In the table below are described the connector specifi cations and functions:
No.ConnectorPin No.TYPE
Thermal head connector
of MT558 model
1
Thermal head connector
of MT558-0101 model
Head-up sensor
2
Paper end sensor
Motor
28
1
10
Connector for FFC (pitch 1.25mm) such as
28
28
10
molex connector series 5597(tick 0.3mm)
part no.39-51-3284 or equivalent.
Connector for FFC (pitch 1.25mm) such as
molex connector series 5597(tick 0.3mm)
part no.39-51-3284 or equivalent.
Molex connector
female housing 51021-1000
User Manual MT558 9
Page 10
3. CONNECTIONS
3.1.1 Thermal head connector of MT558 model
The connector’s pin assignments is as follows:
No.SIGNALFUNCTIONNo.SIGNALFUNCTION
1NCNot connected15
2NCNot connected16
3GNDGround17
4GNDGround18
5GNDGround19
6VH1Head power supply20DIData input
7VH1Head power supply21VCCPower supply
8VH1Head power supply22VCCPower supply
9DOData output23GNDGround
10TMThermistor24GNDGround
11TMThermistor25GNDGround
12CLKSerial clock26VH2Head power supply
13
14
LATLatch (Active low signal)27VH2Head power supply
STB1Strobe1 signal (Active low)28VH2Head power supply
STB2Strobe2 signal (Active low)
STB3Strobe3 signal (Active low)
STB4Strobe4 signal (Active low)
STB5Strobe5 signal (Active low)
STB6Strobe6 signal (Active low)
Connector type: Connector for FFC (pitch 1.25mm)
such as molex connector series 5597(tick 0.3mm) part no.39-51-3284 or equivalent.
NOTE: The symbol “ ─── “ means a negative logical signal.
3.1.2 Thermal head connector of MT558-0101 model
The connector’s pin assignments is as follows:
No.SIGNALFUNCTIONNo.SIGNALFUNCTION
1VHHead power supply15P-GNDPower ground
2VHHead power supply16P-GNDPower ground
3VHHead power supply17P-GNDPower ground
4DOData output18L-GNDLogic ground
5
6CLKSerial clock20NCNot connected
7VDDLogic power supply21STB4Strobe4 signal (Active high)
8STB1Strobe1 signal (Active high)22STB5Strobe5 signal (Active high)
9STB2Strobe2 signal (Active high)23STB6Strobe6 signal (Active high)
10STB3Strobe3 signal (Active high)24NCNot connected
11TMThermistor25DIData input
12TMThermistor26VHHead power supply
13P-GNDPower ground27VHHead power supply
14P-GNDPower ground28VHHead power supply
LATLatch (Active low signal)19NCNot connected
Connector type: Connector for FFC (pitch 1.25mm)
such as molex connector series 5597(tick 0.3mm) part no.39-51-3284 or equivalent.
NOTE: The symbol “ ─── “ means a negative logical signal.
3.1.4 Electrical circuit block diagrams of motor and paper-end sensor
MOTA+
MOTA-
MOTB+
MOTB-
1
3
A
2
Motor
4
5
6
7
8
9
10
B
C
E
A
K
SW1
SW2
1
2
3
4
5
6
7
8
9
10
MOTORPAPER END SENSOR AND
HEAD-UP SENSOR
User Manual MT558 11
Page 12
3. CONNECTIONS
12 MT558 User Manual
Page 13
4. PRINT HEAD
4 PRINT HEAD
MT558 has a thickfi lm thermal printhead and is allowed to have 5.0 A maximum power absorbed, the print density
variation may become larger if the number of dots energized at same time becomes greater than 64.
Scanning Line Time (SLT) is the time to print one complete line using all strobes available. The relation between the
printhead supply voltage and “On Time” (Ton) is as follows:
2
VH
Po = Io2 x Rav =
x Rav
(Rcom x N + Rav + Ric + Rlead)
or
2
Ton =
Eo
Po
Po =
SYMBOLPARAMETERVALUEUNIT
RavAverage resistance (Heater resistance + Lead resistance)120
NNo. of burning dots at same time(0÷192)dots
RcomCommon Resistance0.05
RicDriver saturated resistance15
RleadLead Resistance10
Eo
VH =
TonRav
Po
x (Rcom x N + Rav + Rlead)
4.1 Operation precautions
When continuous printing is performed the supply energy should be reduced so that the substrate temperature 1.
show in Maximum Condition Table.
Power On and Off sequence must be in the following order to prevent the dot element damage:2.
Turn On= Apply the logic supply voltage (Vdd) first and then the printhead supply voltage (VH).
Turn Off= Switch off the printhead supply voltage (VH) fi rst and then turn the logic voltage (Vdd) off.
The printhead shall be disabled in STB during Power ON/OFF, or Power (VH)-Logic(Vdd) sequence described 3.
in note 2 shall be kept.
Heat elements and IC’s shall be anti-electrostatic in order to prevent the electrostatic destruction. Do not touch 4.
the connector pins with naked hands.
The printhead substrate surface is coated with glass and mechanical stress or shock (including dust scratch dam-5.
age) should be avoided to prevent damage.
When the printhead operation is fi nished, printsupply voltage (including the charged voltage with capacitor) should 6.
be reduced to the ground level and remained until next printhead operation occur.
Condensation should be avoided. If condensation occurred, do not switch on the printhead power until condensa-7.
tion disappear.
Print quality would be degraded if paper or ink residue were sticked on the heat element area. For such a case, 8.
please use applicator with alcohol to clean up. Do not use the sandpaper destroying the heat elements.
If printing sound, for example sticking sound, occured, please review and adjust the paper feed mechanism and 9.
the electrical pulse to avoid these kind of mechanical resonance.
Please pay attention that the paper used does not include bad factor to affect printhead life.10.
The print density variation may become larger if the number of dots energized at same time becomes greater 11.
than 64 value.
In order to avoid surge, a 47
ramic capacitor should be placed between VDD and GND.
F capacitor is required between VH and GND at controller board side. 0.1 F ce-12.
User Manual MT558 13
Page 14
4. PRINT HEAD
4.2 Block diagram of the electrical circuit of MT558 model
Print data of 384-bit length is printed in the arrangement as shown in the following fi gure :
aper feeding
direction
Printing paper
Printing surface
Printing data
1 2 3 4 . . . . . . 383 384
Printer mechanism
Motor
4.5 Electrical characteristics of circuit
ITEMSYMBOLMINITYP.MAXI.UNITCONDITIONS
Head power supplyV
Logic power supplyV
Logic supply currentI
Input Voltage
Data input current
(DI)
HighV
LowV
(1)
High
LowI
(1)
STB input current
(STB)
Clock input current
(CLK)
Latch input current
(LAT)
High
LowI
(1)
High
LowI
(1)
High
LowI
H
DD
DD
IH
IL
0.7 x V
IIH DI--0.5A
DI-0.5--A
IL
IIH STB--55A
STB---0.5A
IL
IIH CLK--3A
CLK---3A
IL
IIH LAT--3A
LAT---3A
IL
DATA IN
3.305.008.00V
3.005.005.50V
-9.630mA
DD
--0.3 x V
-VDDV
DD
fCLK = 5MHz
SI = fCLK/2
V
STB, DI, LAT, CLK
VIH = 5V
VDD = 5V
VDD = 5V
VIL = 0V
VIH = 5V
VDD = 5V
VDD = 5V
VIL = 0V
VIH = 5V
VDD = 5V
VDD = 5V
VIL = 0V
VIH = 5V
VDD = 5V
VDD = 5V
VIL = 0V
(1)
Note: Only for MT558-0101 model
Each strobe includes pull-down resistance of 300K ± 50% per IC.
16 MT558 User Manual
Page 17
4.6 Switching characteristics of circuit
The switching characteristic summarized in the following table :
ITEMSYMBOLMIN.TYP.MAX.UNIT
Clock frequencyfCLK--8MHz
Clock widthtw CLK70--ns
Data set-up timet setup DI40--ns
Data hold timet hold DI40--ns
Latch widthtw LAT100--ns
Latch set-up timet setup LAT100--ns
Driver out delay timetdo--26s
4. PRINT HEAD
4.7 Timing chart of MT558 model
CLOCK (CLK)
t setup DIt hold DI
DATA IN (DI)
High: BLACK
Low: WHITE
DATA OUT (DO)
High: BLACK
Low: WHITE
LATCH (LAT)
High : HOLD
Low : THROUGH
STROBE (STB)
DRIVER OUT
Tw CLK
t setup LAT
tw LAT
tdotdo
NOTES: The symbol “ “ means a negative logical signal.
User Manual MT558 17
Page 18
4. PRINT HEAD
4.8 Timing chart of MT558-0101 model
Tw CLK
CLOCK (CLK)
t setup DIt hold DI
DATA IN (DI)
High: BLACK
Low: WHITE
DATA OUT (DO)
High: BLACK
Low: WHITE
t setup LAT
LATCH (LAT)
High : HOLD
Low : THROUGH
tw LAT
STROBE (STB)
DRIVER OUT
NOTES: The symbol “ “ means a negative logical signal.
tdotdo
18 MT558 User Manual
Page 19
0
4. PRINT HEAD
4.9 Thermistor
The thermistor is very important to adjust the strobe time (Tstrobe) ~ (SLT) in function of the head temperature and to
monitor the temperature to prevent the head damage if the temperature is over the limit described in the
Maximum conditions table.
Resistance R25: 30 K ± 5% at 25°C•
B value: 3950 K ± 2%•
Operating temperature: –20 ~ + 80°C•
Time costant: Max. 30 sec.(in the air)•
Then the resistance value, R, versus temperature , T (in °C) is given by the formula:
R(T) = R25 × e { B × (1/TX – 1/T25) }
4.9.1 Thermistore Curves
180
160
140
120
100
80
60
RESISTANCE : (K)Ω
40
20
0
-20
-10
020
10
3040507
TEMPERATURE : ( °C )
60
User Manual MT558 19
Page 20
4. PRINT HEAD
20 MT558 User Manual
Page 21
5 STEPPER MOTOR
5. STEPPER MOTOR
The paper feed pitch for stepper motor is 2 steps for one dotline
(1)
Note: 1 dotline = 0.125 mm.
(1)
.
5.1 Technical specifi cations
ITEMSPECIFICATION
Drive voltageDC 5 V
No. of phases2
Drive modeBipolar drive
Step angle18°
Resistance13 ± 7% at 25 °C (each phase)
Inductance5.32 mH ± 25% at 25°C (1kHz. 1Vrms )
Holding torque85 gf-cm MIN (at 5V)
Pull-out torque20 gf-cm MIN (at 900 pps, 7.2 Vdc)
Insulation resistance30 M MIN (500 Vdc)
Insulation classClass E
Dielectric strength3 mA (at 500V AC 1.0 sec.)
Life500 Hr
5.2 Excitation sequence
The motor is driven in the forward direction if its excitation phases are switched as per the following steps: