Custom Audio Electronics MT002 User Manual

Thermal printing mechanism

MT002

User ’s Manual

www.custom.biz

MT002

All rights reserved. T ot al or even partial reproduction of this manual in any form, whether on paper or electronically ,
is strictly forbidden. While CUSTOM ENGINEERING SP A guarantees that the information cont ained in this manual
has been carefully checked and verified, CUSTOM ENGINEERING SP A and other resources utilized in its creation
assume no responsibility for situations arising from its use.
Feedback regarding any errors in the manual’s content or suggestions on how it could be improved would be
greatly appreciated. Since its products are subject to continuous checking and improvement, CUSTOM
ENGINEERING SP A reserves the right to modify the information cont ained in this manual without prior notice.

COD. DOME - MT002 PRELIMINARY VERS. 0.00
Copyright © 2006 CUST OM ENGINEERING SP A – It aly
CUSTOM ENGINEERING SP A

Str . Berettine 2 - 43010 Fontevivo (P ARMA) - Italy
T el. : [phone] - Fax : [phone]
http: www.custom.biz

T o cont act our Technical Support :
Email : [e-mail]

MT002

Printing mechanism models

A. MT002 Front exterior view

1- Motor
2- Print Head cable
3- Print Head
4- Knob paper feed
A- Paper input
B- Paper outfeed
C- Paper end sensor

A

B

C

4

3

2

1

MT002

Blank page

MT002

INTRODUCTION

CONVENTIONS USED IN THE MANUAL

N.B.

Gives important information or suggestions relative to the use of the printer .

WARNING

The information marked with this symbol must be carefully heeded to safeguard against damaging
the printer.

DANGER

The information marked with this symbol must be carefully heeded to safeguard against injury to
the operator.

GENERAL SPECIFICA TIONS

Item Specification
Printing method
Effective printing width
Head configuration (dots/line)
Dot Pitch
Printing Speed
Paper width (mm)
Paper roll maximum diameter
Paper feed method
Head temperature sensor
Paper detection
Maximum number of dots
activated at a time
Dot resistance (Rav)
Number of strobes

5 °C 0,16 mJ/dot (0,68 ms) VH = 7.2V
25 °C 0,13 mJ/dot (0,55 ms) VH = 7.2VHeader energy
45 °C 0,11 mJ/dot (0,47 ms) V

Driver saturated resistance (Ric)
External dimensions (W x D x H)
Weight
Operation Voltage Thermal head
Current consumption
Life/Reability 50 Km 1 x 108 pulses

Recommended paper weight
Recommanded paper

Noise

Thermal line dot method
48 mm ± 0,2 mm
384
0,125 mm
up to 90 mm/sec
58 mm + 0 / -1 mm
60 mm
Friction feed, 1 dot line/2 pulses, bipolar
Thermistor
Photo interrupter reflessive

100
176 Ω ± 4%

2

= 7.2V

H

9 Ω
67,3 x 17,4 x 33
36 gr.
5 V ± 5%
Medium 2,5 A Max 4 A Peak 3 A

55 g/m
OJI KF-50HDA or equivalent

Max 51dbA

2

(T ab. 1)

MT0021

INTRODUCTION

Maximum ratings at 25°C

Item Specification
Head voltage VH = 8,5 V
Supply voltage VDD = 7 V
Substrate Temperature
Environment operating
temperature range
Operating humidity
Environment storage
temperature (except paper)

MAIN FEA TURES

65 °C

-10 ÷ 50°C
10 ÷ 90 % RH no condensation

-20 ÷ 70 °C

(T ab. 2)

• Paper width : 58 mm + 0 / -1 mm.

• Resolutions 8dot/mm - 203dpi

• Autoloading capability .

• Printing speed up to 90 mm/sec.

• Sensors: Paper end sensor, temperature sensor thermistor 30K.

• Life 50 Km Printed paper .

• Compact Layout.

MT002 2

1. CONNECTIONS

BOTTOM VIEW

PIN 1

PIN 26

(Fig.1.1)

1.1 CONNECTIONS TERMINALS

The mechanism has one interface connector (see fig. 1.1), that includes the thermal head signal, motor control
and paper sensor control. The connector’s pin assignments is as follows (see Tab. 1.1 ):

MT0021-1

1. CONNECTIONS

Connector type : ZIF connector for flexible printed circuit 26 pin (pitch 1 mm)

.oNlangiSnoitcnuF

(Tab.1.1)

1
2
3
4

5

6

7

8
9

01
11
21
31
41

B2HP
B1HP
A1HP
A2HP

rotsisnart-otohP

rotcelloc

edonAdeL

otohP

rotsisnart-

edohtacdeL/rettime
HVYLPPUSREWOPDAEH
HVYLPPUSREWOPDAEH
HVYLPPUSREWOPDAEH

TALHCTAL
DNGDNUORG
DNGDNU
DNGDNUORG

ROTOM

ROSNESDNEREPAP

ORG

51
61
71
81
91
02
12
22
32
42
52
62

1BTSLANGIS1EBORTS

MTROTSIMREHT

V

DD

2BTSLANGIS2EBORTS
DNGDNUORG
DNGDNUORG
DNGDNUORG
KLCKCOLCLAIRES
IDTUPNIATAD

HVYLPPUSREWOP
HVYLPPUSREWOPDAEH
HVYLPPUSREWOPDAEH

Note : The thermistore of print head is connected to V

DAEH

on the capton.

DD

EGATLOVCIGOL

MT002

1-2

1. CONNECTIONS

1.2 Electrical circuit block diagram of motor

PH2B

1

(Fig.1.2)

PH1B

PH1A

PH2A

2

3

4

5
6
7
8
9

A

B

Motor

21
22

23
24
25
26

MT0021-3

1.3 Electrical circuit block diagram of Paper-end sensor

1. CONNECTIONS

C

A

K / E

1

(Fig.1.3)

2
3
4

5

6

7

8
9

21
22

23
24
25
26

MT002

1-4

2. PRINT HEAD

2.1 PRINT HEAD

MT002 has a thickfilm thermal printhead and is allowed to have 4.0 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 T ime” (T on) is as follows:

2

2

oI=oP

=vaRx

HV

oE

=noT

oP

or

oE

=oP

noT

evaRx

2

)ciR+ciR+evaR+NxmocR(

VH = x (Rcom x N + Rav + Ric)

Po

Rav

(Tab.2.1)

Symbol Parameter Value Unit

Rav

N

Rcom

Ric

2.2 OPERA TION PRECAUTIONS

1. When continuous printing is performed the supply energy should be reduced so that the substrate tempera­ture show in Maximum Condition T able

2. Power On and Off sequence must be in the following order to prevent the dot element damage:
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.

3. The printhead shall be disabled in STB during Power ON/OFF , or Power (VH)-Logic(Vdd) sequence
described in note 2 shall be kept.

4. Heat elements and IC’s shall be anti-electrostatic in order to prevent the electrostatic destruction. Do not
touch the connector pins with naked hands.

5. The printhead substrate surface is coated with glass and mechanical stress or shock (including dust
scratch damage) should be avoided to prevent damage.

6. When the printhead operation is finished, printsupply voltage (including the charged voltage with capacitor)
should be reduced to the ground level and remained until next printhead operation occur.

7. Condensation should be avoided. If condensation occurred, do not switch on the printhead power until
condensation disappear.

8. Print quality would be degraded if paper or ink residue were sticked on the heat element area. For such a

case, please use applicator with alcohol to clean up. Do not use the sandpaper destroying the heat
elements.

(Heater resistance + Lead resistance)

Average resistance

No. of burning dots at same time (example 100) dots

Common Resistance 0.05

Driver saturated resistance 9

176

Ω

Ω
Ω

MT0022-1

2. PRINT HEAD

9. If printing sound, for example sticking sound, occured, please review and adjust the paper feed
mechanism and the electrical pulse to avoid these kind of mechanical resonance.

10. Please pay attention that the paper used does not include bad factor to affect printhead life.

1 1. The print density variation may become larger if the number of dots energized at same time becomes

greater than 100.

12. In order to avoid surge, a 47 μF capacitor is required between VH and GND at controller board
side. 0.1 μF ceramic capacitor should be placed between VDD and GND.

2.3 BLOCK DIAGRAM OF THE ELECTRICAL CIRCUIT

(Fig.2.1)

VH

GND

STB2

STB1

LAT

DI

CLK

VDD

8, 9, 10, 24, 25, 26

7, 12, 13, 14, 19, 20, 21

18

15

11

23

22

17

DOT #384

DOT #1

654321

LATCH REGIST E R

SHIFT REGISTER

TM

16

MT002

THERMISTOR

2-2

.oNBTS.oNtoDBTS/stoD

1

2

(Tab.2.2)

291~1291

483~391291

2. PRINT HEAD

N

2.4 PRINTING DA T A AND PRINTING POSITION

Print data of 384-bit length is printed in the arrangement as shown in the following figure :

Printing surface

Printing data

Printer mechanism

Paper feeding d irection

Printing paper

(Fig.2.2)

DATA I

Motor

2.5 ELECTRICAL CHARACTERISTICS OF CIRCUIT

Item SYMBOL MINI TYP. MAXI. Unit Conditions

I

IH

I

IL

I

IH

I

IL

I

IH

I

V

V

I
V
V

I

IH

I

IL

STB
STB
CLK
CLK
LAT
LAT

IL

DD

DD

DI
DI

H

-7.28.5V

3.00 5.00 5.25 V

- - 54 m A fDI = fCLK/2

IH
IL

0.8 x V

DD

0-

-

V

DD

0.2 x V

DD

V
V

STB, DI, LAT, CLK

--0.5uA

---0.5uA

- - 30 uA

---0.5uA

--3uA

---3uA

--3uA

VIH = 5V

VIL = 0V

---3uA

Head power supply
Logic power supply
Logic supply current

Input Voltage
Data input current

(DI)
STB input current
(STB)
Clock input current
(CLK)
Latch input current
(LAT)

High
Low
High
Low
High
Low
High
Low
High
Low

(Tab.2.3)

MT0022-3

2. PRINT HEAD

2.6 SWITCHING CHARACTERISTICS OF CIRCUIT

The switching characteristic summarized in the following table :

Item SYMBOL MIN. TYP. MAX. UNIT CONDITIONS

V

Clock frequency fCLK

-58

-35

MHz

Clock width tw CLK 95 (155) - - ns
Data set-up time t setup DI 100 (140) - - ns
Data hold time t hold DI 85 - - ns

Data out delay time td DO

-50-

-90-

ns

Latch width tw LAT 150 - - ns
Latch set-up time t setup LAT 200 - - ns
Latch Hold time t hold LAT 80 - - ns
STB set-up time t setup STB 300 - - ns
Driver out delay time tdo - - 10 (30)

μs

Notes : CLK should be used at duty 50% (± 5%), if operated more than fCLK = 5MHz (or fCLK =
3MHz when VDD = 3.3 V). Also, CLK should be within one cycle , being subject to the ratio
between DA T A SET -UP TIME and DA T A HOLD TIME is 1:1.

VDD= 5.0V, f
V

DD

V

DD

= 5.0V

DD

V

= 3.3V

DD

V

V

DD

= 5.0V

DD

= 3.3V

CLK
CLK

= 3.3V, f

= 5.0V (VDD= 3.3V)

(Tab.2.4)

= 5MHz
= 3MHz

2.7 TIMING CHART

CLOCK (CLK)

DATA IN (DI)

High : BLACK
Low : WHITE

DATA OUT (DO)

High : BLACK
Low : WHITE

LATCH (LAT)

High : HOLD
Low : THROUGH

STROBE (STB)

DRIVER OUT

t setup DI

Tw CLK

td DO

t setup LAT

t hold DI

tw LAT

t setup STB

tdo

(Fig.2.3)

t hold LAT

tdo

Notes : Symbol “ “ :means a negative logic signal.

MT002

2-4

2. PRINT HEAD

)

R

2.8 THERMISTOR

The thermistor is very important to adjust the strobe time (T strobe) ~ (SL T) 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 KW ± 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)}

2.8.1 Thermistore Curves
(Fig.2.4)

Ω

ESISTANCE : (K )

180
160

140
120
100

80
60

40
20

0

-10

020

10

30 40 50 70-20

TEMPERATURE : ( °C

60

MT0022-5

2. PRINT HEAD

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MT002

2-6

3. STEPPER MOTOR

3.1 STEPPER MOTOR

The paper feed pitch for stepper motor is 2 steps for one dotline

(1)

Note: 1 dotline = 0.125 mm.

3.1.1 T echnical specifications

Item Specification
Drive voltage
No. of phases
Drive mode
Step angle
Rated current
Resistance
Inductance
Holding torque
Pull-out torque (1200 pps)
Insulation resistance
Insulation class
Dielectric strength
Life
Maximum coil temperature

DC 5.5 V
2
Bipolar drive
18° ± 2°
350 mA / Phase
12Ω ± 7% at 25 °C (each phase)

3.7 mH ± 25% at 25°C (1kHz. 1Vrms )

33.7 gf-cm MIN

13.3 gf-cm MIN
100 MΩ MIN (500 Vdc)
Class E
AC 500V 1 min.
3000 Hr min.
115°C

(1)

.

(Tab.3.1)

3.1.2 Excitation sequence

The motor is driven in the forward direction if its excitation phases are switched as per the following steps :

ecneuqeS

langiS

B2HPB1HPA1HPA2HP
1petShgiHwoLwoLhgiH
2petShgiHwoLhgiHwoL
3petSwoLhgiHhgiHwoL
4petSwoLhgiHwoLhgiH

(Tab.3.2)

MT0023-1

3. STEPPER MOTOR

1

Excitation V oltage Waveforms

(PH2B)

(PH1B)

(PH1A)

(PH2A)

H

L

H

L

H

L

H

L

STEP1

dot line

STEP2 STEP3

(Fig.3.1)

STEP4

3.2 PRECAUTION

1. Drive the motor with mosfet driver to obtain the maximum torque force instead transistor driver , transistor
driver lose voltage VCEsat *2.

2. Please check the ratio print/pause to prevent the overtemperature on stepper motor.

3. If the motor is driven by more than 5 volts we suggest to use a chopper driving, in order to reduce
current, please contact CUSTOM ENGINEERING SP A for further information.

MT002

3-2

4. SENSOR

4.1 SENSOR

Maximum Ratings (T a = 25°C)

Parameter Symbol Rating Unit

Power dissipation

Input

Reverse voltage
Forward current
Pulse fo rward current

(1)

Collector power dissipation

Output

Collector current
Collector-emitter voltage

Emitter- colle ct or vo lta ge
Operating temperature range
Storage temperature range

(1)

NOTE: Pulse width

≤

100 μs, Repetitive frequency = 100 Hz.

V
V
T

T

Opto-electrical characteristics (T a = 25°C)

P
V

I

I

FP

P

I

C
CEO
ECO
OPR
STG

(Tab.4.1)

D
R

F

75 mW

5V

50 mA

1A

C

50 mW
20 mA
30 V

3V

-20 ~ 85 °C

-30 ~ 100 °C

(Tab.4.2)

Parameter Symbol Conditions MIN. TYP. MAX. Unit

Forward voltage

Input

Reverse current
Peak emission

wavelength
Collector dark

Output

current
Peak sensibility

wavelength

Light current
Leakage current

Switching
speeds

Rise time
Fall time

V

I

λ

I

CEO

λ

I

I

LEAK

t
t

F

R

P

P

L

V
V

r
f

V

IF = 10 mA

VR = 5 V

IF = 10 mA

V

= 10 V

CE

= 5 V, IF = 10 mA

CE

= 5 V, IF = 10 mA

CE

= 2 V, IC = 0.1 mA

CC

= 1 KΩ

R

L

--1.3V

--10

μA

- 940 - nm

--0.2

μA

- 900 - nm

90 - -

--0.2

-30-

-25-

μA
μA

μs
μs

MT00214-

4.2 GRAPHICS OF TYPICAL CHARACTERISTICS

Collector Power dissipation vs. Ambient Temperature

4. SENSOR

(Fig.4.1)

Forward Current vs. Forward Voltage

(Fig.4.2)

MT002 24-

4. SENSOR

Light Current vs. Forward Current

(Fig.4.3)

Light Current vs. Collector-Emitter V oltage

(Fig.4.4)

90% Reflective paper

MT00234-

Relative light current vs Ambient temperature

4. SENSOR

(Fig.4.5)

Dark current vs Ambient temperature

(Fig.4.6)

MT002 44-

4. SENSOR

Switching time vs Load resistance

(Fig.4.7)

Relative light current vs Moving distance

(Fig.4.8)

MT00254-

4. SENSOR

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MT002 64-

5. DIMENSIONS

A

3

0

5.1 DIMENSIONS OF MT001 MODEL

The figure 5.1 illustrates the overall dimensions for the MT002 thermal printing mechanism.

(Dimensions in mm)

0,3

67,3

30,55

26,85

32,95

4,5

+0.05

- 0.05

+0.05

- 0.05

10,5

2

(Fig.5.1)

29

57,5

Section A-

+0.05

4,5

- 0.05

13,6

3,7

11,7

+0.1

- 0.1

26

33

89°

55°

2,6

2,5

4,7

58,1

21,5

13,5

17,4

∅

5

∅

27

28,5

∅

1,9; n°3 holes

27,75 27,75

15-

MT002

5. DIMENSIONS

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MT002

25-