Custom Audio Electronics MT558 User manual

OEM
MT558
MT558
USER MANUAL

All rights reserved. Total or partial reproduction of this manual in whatever form, whether by printed or elec-
tronic means, is forbidden. While guaranteeing that the information contained in it has been carefully checked,
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 notification.
Copyright © 2002 CUSTOM ENGINEERING S.p.a. – Italy
CUSTOM ENGINEERING S.p.A.
Str. Berettine 2 - 43010 Fontevivo (PARMA) - Italy
Tel.: [phone] - Fax: [phone]
http: www.custom.biz
Customer Service Department:
Email: [email protected]

TABLE OF CONTENTS
1 INTRODUCTION......................................................................................................................................................5
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 CONNECTIONS.......................................................................................................................................................9
3.1 Connections terminals...................................................................................................................................... 9
3.1.1 Thermal head connector of MT558 model .................................................................................................. 10
3.1.2 Thermal head connector of MT558-0101 model ......................................................................................... 10
3.1.3 Motor/ Paper-end sensor connector............................................................................................................ 11
3.1.4 Electrical circuit block diagrams of motor and paper-end sensor................................................................ 11
4 PRINT HEAD..........................................................................................................................................................13
4.1 Operation precautions .................................................................................................................................... 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
4.9 Thermistor ...................................................................................................................................................... 19
4.9.1 Thermistore Curves..................................................................................................................................... 19
5 STEPPER MOTOR ................................................................................................................................................21
5.1 Technical speci cations.................................................................................................................................. 21
5.2 Excitation sequence ....................................................................................................................................... 21
5.3 Precaution ...................................................................................................................................................... 22
6 SENSOR ................................................................................................................................................................23
6.1 Graphics of typical characteristics.................................................................................................................. 24
7 DIMENSIONS.........................................................................................................................................................29
7.1 DIMENSIONS OF MT558 MODEL................................................................................................................. 29
7.2 DIMENSIONS OF MT558-0101 ..................................................................................................................... 30
TABLE OF CONTENTS
User Manual MT558 3

TABLE OF CONTENTS
4 MT558 User Manual

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 pro-
cedures specifically indicated in the user manual.
1.2 General features
PAPER WIDTH 58 mm
RESOLUTIONS 8 dot/mm (203dpi)
PRINTING SPEED 65 mm/sec.
LOGIC VOLTAGE 5V
SENSORS Paper end, head up detection, temperature thermistor 30K
LIFE 50 Km printed paper
AUTOLOADING CAPABILITY
COMPACT LAYOUT
HIGH TORQUE PAPER-PULLING MOTOR
SILICON RUBBER PAPER FEEDING ROLL
1.3 Print head specifications
PRINTING METHOD Thermal line dot method
EFFECTIVE PRINTING WIDTH 48 mm
HEAD CONFIGURATION (DOTS/LINE) 384
DOT PITCH 0,125 mm
PRINTING SPEED (see power consumption and energy dots) 65 mm/sec
PAPER WIDTH (MM) 58 mm
PAPER FEED METHOD Friction feed, 1 dot line/2 pulses, bipolar 1-2 phase excitation
HEAD TEMPERATURE SENSOR Thermistor
PAPER DETECTION Photo interrupter reflessive
MAXIMUM NUMBER OF DOTS ACTIVATED AT A TIME 192
DOT RESISTANCE (RAV) 120 
1. INTRODUCTION
User Manual MT558 5

NUMBER OF STROBES 6
HEATER ENERGY
5°C 0,27 mJ/dot (1,8 ms)
25°C 0,21 mJ/dot (1,4 ms)
45°C 0,18 mJ/dot (1,2 ms)
DRIVER SATURATED RESISTANCE (RIC) 13 
EXTERNAL DIMENSIONS (W x D x H) 84,55 x 44,25 x 20
WEIGHT 72 gr
OPERATION VOLTAGE RANGE LOGIC 7 V
OPERATION VOLTAGE DOTLINE HEAD 5 V
CURRENT CONSUMPTION Printing 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 / REABILITY 50 Km 1 x 108pulse
RECOMMENDED PAPER WEIGTH 55 g/m2
RECOMMENDED PAPER KF-50HDA or equivalent
HEAD VOLTAGE VH= 8,5 V
SUPPLY VOLTAGE VDD = 3 ÷ 5,5 V
SUBSTRATE TEMPERATURE 65 °C
ENVIRONMENT OPERATING TEMPERATURE RANGE 5 ÷ 50°C
OPERATING HUMIDITY 10 ÷ 90 % RH no condensation
ENVIRONMENT STORAGE TEMPERATURE (EXCEPT PAPER) -25 ÷ 70 °C
1. INTRODUCTION
6 MT558 User Manual

2 INSTALLATION AND USE
2.1 Front exterior view of MT558
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
1
2
5
43
6
B
C
A
2. INSTALLATION AND USE
User Manual MT558 7

2.2 Front exterior view of MT558-0101 (model with flat 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
B
C
A
1
2
5
43
6
2. INSTALLATION AND USE
8 MT558 User Manual

3 CONNECTIONS
3.1 Connections terminals
The mechanism has two interface connectors (see following figure), that includes the thermal head connector and
motor-paper control connector.
Thermal head
connector
1
28
Motor-paper
control connector
1
10
In the table below are described the connector specifications and functions:
No. Connector Pin No. TYPE
1
Thermal head connector
of MT558 model 28
Connector for FFC (pitch 1.25mm) such as
molex connector series 5597(tick 0.3mm)
part no.39-51-3284 or equivalent.
Thermal head connector
of MT558-0101 model 28
Connector for FFC (pitch 1.25mm) such as
molex connector series 5597(tick 0.3mm)
part no.39-51-3284 or equivalent.
2
Head-up sensor
10 Molex connector
female housing 51021-1000
Paper end sensor
Motor
3. CONNECTIONS
User Manual MT558 9

3.1.1 Thermal head connector of MT558 model
The connector’s pin assignments is as follows:
No. SIGNAL FUNCTION No. SIGNAL FUNCTION
1 NC Not connected 15 STB2 Strobe2 signal (Active low)
2 NC Not connected 16 STB3 Strobe3 signal (Active low)
3 GND Ground 17 STB4 Strobe4 signal (Active low)
4 GND Ground 18 STB5 Strobe5 signal (Active low)
5 GND Ground 19 STB6 Strobe6 signal (Active low)
6 VH1 Head power supply 20 DI Data input
7 VH1 Head power supply 21 VCC Power supply
8 VH1 Head power supply 22 VCC Power supply
9 DO Data output 23 GND Ground
10 TM Thermistor 24 GND Ground
11 TM Thermistor 25 GND Ground
12 CLK Serial clock 26 VH2 Head power supply
13 LAT Latch (Active low signal) 27 VH2 Head power supply
14 STB1 Strobe1 signal (Active low) 28 VH2 Head power supply
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. SIGNAL FUNCTION No. SIGNAL FUNCTION
1 VH Head power supply 15 P-GND Power ground
2 VH Head power supply 16 P-GND Power ground
3 VH Head power supply 17 P-GND Power ground
4 DO Data output 18 L-GND Logic ground
5LAT Latch (Active low signal) 19 NC Not connected
6 CLK Serial clock 20 NC Not connected
7 VDD Logic power supply 21 STB4 Strobe4 signal (Active high)
8 STB1 Strobe1 signal (Active high) 22 STB5 Strobe5 signal (Active high)
9 STB2 Strobe2 signal (Active high) 23 STB6 Strobe6 signal (Active high)
10 STB3 Strobe3 signal (Active high) 24 NC Not connected
11 TM Thermistor 25 DI Data input
12 TM Thermistor 26 VH Head power supply
13 P-GND Power ground 27 VH Head power supply
14 P-GND Power ground 28 VH Head power supply
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. CONNECTIONS
10 MT558 User Manual

3.1.3 Motor/ Paper-end sensor connector
The connector’s pin assignments is as follows:
No. SIGNAL FUNCTION
1 MOTA+
Motor
2 MOTB+
3 MOTA-
4 MOTB-
5 C Collector photo transistor paper
6 E Emitter photo transistor paper
7 A LED Anode paper
8 K LED Cathode paper
9 SW1 Switch signal 1 of head-up sensor output
10 SW2 Switch signal 2 of head-up sensor output
Connector type: Molex connector female housing 51021-1000
3.1.4 Electrical circuit block diagrams of motor and paper-end sensor
1
3
2
4
5
6
8
7
9
10
MOTA+
Motor
A
B
MOTA-
MOTB+
MOTB-
7
C
E
A
1
2
3
4
5
6
8
9
10
SW1
SW2
K
MOTOR PAPER END SENSOR AND
HEAD-UP SENSOR
3. CONNECTIONS
User Manual MT558 11

3. CONNECTIONS
12 MT558 User Manual

4 PRINT HEAD
MT558 has a thickfilm 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:
Po = Io2x Rav = VH2x Rav Ton = Eo
(Rcom x N + Rav + Ric + Rlead)2Po
or
Po = Eo VH = Po x (Rcom x N + Rav + Rlead)
Ton Rav
SYMBOL PARAMETER VALUE UNIT
Rav Average resistance (Heater resistance + Lead resistance) 120 
N No. of burning dots at same time (0÷192) dots
Rcom Common Resistance 0.05 
Ric Driver saturated resistance 15 
Rlead Lead Resistance 10 
4.1 Operation precautions
When continuous printing is performed the supply energy should be reduced so that the substrate temperature1.
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) first 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 described3.
in note 2 shall be kept.
Heat elements and IC’s shall be anti-electrostatic in order to prevent the electrostatic destruction. Do not touch4.
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 finished, printsupply voltage (including the charged voltage with capacitor) should6.
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 and9.
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 greater11.
than 64 value.
In order to avoid surge, a 47 F capacitor is required between VH and GND at controller board side. 0.1 F ce-12.
ramic capacitor should be placed between VDD and GND.
4. PRINT HEAD
User Manual MT558 13

4.2 Block diagram of the electrical circuit of MT558 model
THERMISTOR
30KΩB:3950
6, 7, 8, 26, 27, 28 DOT #384 DOT #1
3, 4, 5, 23, 24, 25
16
14
13
20
12
10
11
VH
GND
TM
TM
CLK
DI
LAT
STB1
STB3
21, 22
VCC
126543
LATCH REGISTER
SHIFT REGISTER
1, 2
NC
DO
9
15
STB2
19
17
STB4
STB6
18
STB5
STB No. Dot No. Dots/STB
1 1 ~ 64 64
2 65 ~ 128 64
3 129 ~ 192 64
4 193 ~ 256 64
5 257 ~ 320 64
6 321 ~ 384 64
4. PRINT HEAD
14 MT558 User Manual

4.3 Block diagram of the electrical circuit of MT558-0101 model
THERMISTOR
30KΩB:3950
1, 2, 3, 26, 27, 28 DOT #384 DOT #1
13, 14, 15, 16, 17, 18
10
8
5
25
6
11
12
VH
GND
TM
TM
CLK
DI
LAT
STB1
STB3
7
VDD
126543
LATCH REGISTER
SHIFT REGISTER
19, 20, 24
NC
DO
4
9
STB2
23
21
STB4
STB6
22
STB5
Each STB Line is pulled-down within the driver IC
STB No. Dot No. Dots/STB
1 1 ~ 64 64
2 65 ~ 128 64
3 129 ~ 192 64
4 193 ~ 256 64
5 257 ~ 320 64
6 321 ~ 384 64
4. PRINT HEAD
User Manual MT558 15

4.4 Printing data and printing position
Print data of 384-bit length is printed in the arrangement as shown in the following figure :
Printing data
Printing paper
DATA IN
Printer mechanism
Motor
1 2 3 4 . . . . . . 383 384
Printing surface
P
aper
f
ee
di
ng
direction
4.5 Electrical characteristics of circuit
ITEM SYMBOL MINI TYP. MAXI. UNIT CONDITIONS
Head power supply VH3.30 5.00 8.00 V
Logic power supply VDD 3.00 5.00 5.50 V
Logic supply current IDD - 9.6 30 mA fCLK = 5MHz
SI = fCLK/2
Input Voltage High VIH 0.7 x VDD -V
DD VSTB, DI, LAT, CLK
Low VIL - - 0.3 x VDD V
Data input current
(DI)
High(1) IIH DI - - 0.5 AVIH = 5V
VDD = 5V
Low IIL DI -0.5 - - AVDD = 5V
VIL = 0V
STB input current
(STB)
High(1) IIH STB - - 55 AVIH = 5V
VDD = 5V
Low IIL STB - - -0.5 AVDD = 5V
VIL = 0V
Clock input current
(CLK)
High(1) IIH CLK - - 3 AVIH = 5V
VDD = 5V
Low IIL CLK - - -3 AVDD = 5V
VIL = 0V
Latch input current
(LAT)
High(1) IIH LAT - - 3 AVIH = 5V
VDD = 5V
Low IIL LAT - - -3 AVDD = 5V
VIL = 0V
(1) Note: Only for MT558-0101 model
Each strobe includes pull-down resistance of 300K± 50% per IC.
4. PRINT HEAD
16 MT558 User Manual

4.6 Switching characteristics of circuit
The switching characteristic summarized in the following table :
ITEM SYMBOL MIN. TYP. MAX. UNIT
Clock frequency fCLK - - 8 MHz
Clock width tw CLK 70 - - ns
Data set-up time t setup DI 40 - - ns
Data hold time t hold DI 40 - - ns
Latch width tw LAT 100 - - ns
Latch set-up time t setup LAT 100 - - ns
Driver out delay time tdo - - 26 s
4.7 Timing chart of MT558 model
CLOCK (CLK)
LATCH (LAT)
High : HOLD
Low : THROUGH
DRIVER OUT
STROBE (STB)
DATA OUT (DO)
High: BLACK
Low: WHITE
DATA IN (DI)
High: BLACK
Low: WHITE
Tw CLK
t setup DI t hold DI
tw LAT
tdo tdo
t setup LAT
NOTES: The symbol “  “ means a negative logical signal.
4. PRINT HEAD
User Manual MT558 17

4.8 Timing chart of MT558-0101 model
CLOCK (CLK)
LATCH (LAT)
High : HOLD
Low : THROUGH
DRIVER OUT
STROBE (STB)
DATA OUT (DO)
High: BLACK
Low: WHITE
DATA IN (DI)
High: BLACK
Low: WHITE
Tw CLK
t setup DI t hold DI
tw LAT
tdo tdo
t setup LAT
NOTES: The symbol “  “ means a negative logical signal.
4. PRINT HEAD
18 MT558 User Manual

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
0
180
140
TEMPERATURE : ( °C )
RESISTANCE : (K )Ω
020
30 40 50 7
0
-20
100
20
80
40
60
120
160
-10 10 60
4. PRINT HEAD
User Manual MT558 19

4. PRINT HEAD
20 MT558 User Manual