Custom Audio Electronics MT002 User manual

MT002
www.custom.biz
Thermal printing mechanism
MT002
User’s Manual

MT002
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isstrictly forbidden. WhileCUSTOMENGINEERING SPAguaranteesthattheinformationcontainedin this manual
hasbeen carefully checked andverified,CUSTOMENGINEERINGSPAandotherresourcesutilizedinitscreation
assume no responsibility for situations arising from its use.
Feedbackregarding any errors inthe manual’s content orsuggestions on how itcould be improved wouldbe
greatlyappreciated. Since its productsare subject tocontinuouschecking and improvement,CUSTOM
ENGINEERINGSPAreservesthe right tomodify the information containedin this manualwithoutprior notice.
COD.DOME-MT002 PRELIMINARY VERS. 0.00
Copyright©2006 CUSTOMENGINEERINGSPA–Italy
CUSTOMENGINEERINGSPA
Str.Berettine 2 - 43010Fontevivo(PARMA) - Italy
Tel.: [phone] - Fax:[phone]
http:www.custom.biz
To contact our Technical Support :
Email : [email protected]

MT002
1
2
3
B
A
C
4
Printing mechanism models
A. MT002 Front exterior view
1-Motor
2-Print Head cable
3-PrintHead
4-Knobpaper feed
A-Paper input
B-Paperoutfeed
C-Paperendsensor

MT002
Blankpage

INTRODUCTION
MT0021
CONVENTIONSUSED IN THE MANUAL
N.B.
Givesimportantinformation orsuggestionsrelative to the useofthe printer.
WARNING
Theinformation marked with thissymbolmust be carefully heededtosafeguard against damaging
theprinter.
DANGER
Theinformation marked withthissymbol must becarefully heeded tosafeguardagainst injury to
theoperator.
GENERALSPECIFICATIONS
Item Specification
Printing method Thermal line dot method
Effective printing width 48 mm ±0,2 mm
Head configuration (dots/line) 384
Dot Pitch 0,125 mm
Printing Speed up to 90 mm/sec
Paper width (mm) 58 mm + 0 / -1 mm
Paper roll maximum diameter 60 mm
Paper feed method Friction feed, 1 dot line/2 pulses, bipolar
Head temperature sensor Thermistor
Paper detection Photo interrupter reflessive
Maximum number of dots
activated at a time 100
Dot resistance (Rav) 176 Ω±4%
Number of strobes 2
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) VH= 7.2V
Driver saturated resistance (Ric) 9 Ω
External dimensions (W x D x H) 67,3 x 17,4 x 33
Weight 36 gr.
Operation Voltage Thermal head 5 V ±5%
Current consumption Medium 2,5 A Max 4 A Peak 3 A
Life/Reability 50 Km 1 x 108pulses
Recommended paper weight 55 g/m2
Recommanded paper OJI KF-50HDA or equivalent
Noise Max 51dbA
(Tab. 1)

INTRODUCTION
MT002 2
(Tab. 2)
Maximum ratings at 25°C
Item Specification
Head voltage VH= 8,5 V
Supply voltage VDD = 7 V
Substrate Temperature 65 °C
Environment operating
temperature range -10 ÷50°C
Operating humidity 10 ÷90 % RH no condensation
Environment storage
temperature (except paper) -20 ÷70 °C
MAINFEATURES
•Paper width : 58 mm + 0 / -1 mm.
•Resolutions8dot/mm - 203dpi
•Autoloadingcapability.
•Printing speed up to 90 mm/sec.
•Sensors:Paper end sensor,temperaturesensor thermistor 30K.
•Life50 Km Printed paper.
•CompactLayout.

1. CONNECTIONS
MT0021-1
PIN 1
PIN 26
(Fig.1.1)
BOTTOM VIEW
1.1CONNECTIONS 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 ):

1. CONNECTIONS
MT002 1-2
Connector type : ZIF connector for flexible printed circuit 26 pin (pitch 1 mm)
Note : The thermistore of print head is connected to VDD on the capton.
.oNlangiSnoitcnuF
1B2HP
ROTOM
2B1HP
3A1HP
4A2HP
5rotsisnart-otohP rotcelloc
ROSNESDNEREPAP
6edonAdeL
7rotsisnart-
otohP edohtacdeL/rettime
8HVYLPPUSREWOPDAEH
9HVYLPPUSREWOPDAEH
01 HVYLPPUSREWOPDAEH
11 TALHCTAL
21 DNGDNUORG
31 DNGDNU
ORG
41 DNGDNUORG
51 1BTSLANGIS1EBORTS
61 MTROTSIMREHT
71 V
DD
EGATLOVCIGOL
81 2BTSLANGIS2EBORTS
91 DNGDNUORG
02 DNGDNUORG
12 DNGDNUORG
22 KLCKCOLCLAIRES
32 IDTUPNIATAD
42 HVYLPPUSREWOP
DAEH
52 HVYLPPUSREWOPDAEH
62 HVYLPPUSREWOPDAEH
(Tab.1.1)

1. CONNECTIONS
MT0021-3
Motor
1
2
3
4
5
6
7
8
9
21
22
23
24
25
26
PH2B
PH1B
PH1A
PH2A
A
B
1.2 Electrical circuit block diagram of motor
(Fig.1.2)

1. CONNECTIONS
MT002 1-4
5
6
7
A
C
K / E
1
3
2
4
8
9
21
22
23
24
25
26
(Fig.1.3)
1.3 Electrical circuit block diagram of Paper-end sensor

2. PRINT HEAD
MT0022-1
2.1PRINTHEAD
MT002has a thickfilmthermalprinthead and isallowedto have 4.0Amaximumpower absorbed, theprint
densityvariation may becomelarger if thenumber of dotsenergized at sametime becomes greaterthan 64.
Scanning Line Time (SLT) is the time to print one complete line using all strobes available.
Therelationbetween the printhead supplyvoltageand“OnTime”(Ton)is as follows:
oI=oP
2
=vaRx HV
2
evaRx
)ciR+ciR+evaR+NxmocR(
2
=noT oE
oP
or
=oP oE
noT
VH = x (Rcom x N + Rav + Ric)
Symbol Parameter Value Unit
Rav Average resistance
(Heater resistance + Lead resistance) 176 Ω
NNo. of burning dots at same time (example 100) dots
Rcom Common Resistance 0.05 Ω
Ric Driver saturated resistance 9 Ω
2.2OPERATIONPRECAUTIONS
1. Whencontinuousprinting is performedthe supply energy shouldbe reduced sothat the substrate tempera-
ture show in Maximum ConditionTable
2. PowerOn and Off sequencemustbe in the followingorder to prevent thedotelement damage:
TurnOn=Applythelogic supply voltage (Vdd) first andthen the printhead supplyvoltage(VH).
TurnOff=Switch off the printheadsupplyvoltage (VH) first andthenturn the logic voltage(Vdd)off.
3. Theprintheadshallbe disabled in STB duringPowerON/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
scratchdamage)shouldbeavoidedtopreventdamage.
6. Whentheprinthead operation is finished, printsupplyvoltage(includingthe charged voltage with capacitor)
shouldbereduced to the groundlevelandremained until next printheadoperationoccur.
7. Condensationshouldbe avoided. If condensationoccurred,donot switch on theprintheadpoweruntil
condensationdisappear.
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.
Rav
Po
(Tab.2.1)

2. PRINT HEAD
MT002 2-2
654321
THERMISTOR
8, 9, 10, 24, 25, 26
7, 12, 13, 14, 19, 20, 21
18
15
11
23
22
17
DOT #384 DOT #1
VH
GND
STB2
STB1
LAT
LATCH REGISTER
SHIFT REGISTER
DI
CLK
VDD
16
TM
(Tab.2.2)
9. Ifprinting sound, for examplestickingsound, occured, please reviewandadjust the paperfeed
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.
11. Theprint densityvariation may become largerif the numberof dots energized atsame time becomes
greaterthan100.
12. In ordertoavoid surge, a47μFcapacitoris required between VHandGND at controllerboard
side. 0.1 μF ceramic capacitor should be placed between VDD and GND.
2.3BLOCK DIAGRAM OF THE ELECTRICAL CIRCUIT
.oNBTS.oNtoDBTS/stoD
1291~1291
2483~391291
(Fig.2.1)

2. PRINT HEAD
MT0022-3
Printing surface
Printing data
Printing paper
Printer mechanism
Motor
Paper feeding direction
DATA I
N
2.4 PRINTING DATAAND PRINTING POSITION
Printdata of 384-bit length isprinted in the arrangement asshown in the following figure:
2.5ELECTRICAL CHARACTERISTICS OF CIRCUIT
Item SYMBOL MINI TYP. MAXI. Unit Conditions
Head power supply VH-7.28.5V
Logic power supply VDD 3.00 5.00 5.25 V
Logic supply current IDD - - 54 mA fDI = fCLK/2
High VIH 0.8 x VDD -VDD V
Input Voltage Low VIL 0-
0.2 x VDD VSTB, DI, LAT, CLK
High IIH DI --0.5uA
Data input current
(DI) Low IIL DI ---0.5uA
High IIH STB - - 30 uA
STB input current
(STB) Low IIL STB ---0.5uA
High IIH CLK --3uA
Clock input current
(CLK) Low IIL CLK ---3uA
High IIH LAT --3uA
Latch input current
(LAT) Low IIL LAT ---3uA
VIH = 5V
VIL = 0V
(Fig.2.2)
(Tab.2.3)

2. PRINT HEAD
MT002 2-4
CLOCK (CLK)
LATCH (LAT)
STROBE (STB)
Tw CLK
DATA OUT (DO)
High : HOLD
Low : THROUGH
td DO
t hold DI
DATA IN (DI)
High : BLACK
Low : WHITE
t setup DI
t hold LAT
High : BLACK
Low : WHITE
t setup LAT
tw LAT t setup STB
DRIVER OUT
tdo tdo
(Tab.2.4)
2.6SWITCHINGCHARACTERISTICSOFCIRCUIT
The switching characteristic summarized in the following table :
Item SYMBOL MIN. TYP. MAX. UNIT CONDITIONS
-58 VDD= 5.0V
Clock frequency fCLK -35 MHz VDD = 3.3V
Clock width tw CLK 95 (155) - - ns
Data set-up time t setup DI 100 (140) - - ns VDD= 5.0V, fCLK = 5MHz
VDD= 3.3V, fCLK = 3MHz
Data hold time t hold DI 85 - - ns
-50- VDD= 5.0V
Data out delay time td DO -90- ns VDD = 3.3V
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) μsVDD= 5.0V (VDD= 3.3V)
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
betweenDATASET-UPTIMEandDATAHOLDTIMEis 1:1.
2.7 TIMING CHART
Notes : Symbol “ “ :means a negative logic signal.
(Fig.2.3)

2. PRINT HEAD
MT0022-5
0
180
140
TEMPERATURE:
(
°C
)
R
ESISTANCE:(K )
Ω
020
30 40 50 70-20
100
20
80
40
60
120
160
-10 10 60
2.8THERMISTOR
Thethermistor is veryimportant to adjust thestrobe time (Tstrobe)~ (SLT) in functionof the headtemperature
andto monitor thetemperatureto prevent thehead damage if thetemperature is overthelimit described inthe
Maximum conditions table.
·Resistance R25 : 30 KW ± 5% at 25°C
·Bvalue : 3950 K ± 2%
·Operatingtemperature: –20 ~ + 80°C
·Time costant : Max. 30 sec.(in the air)
Thenthe resistance value,R,versus temperature ,T (in °C) isgiven by the formula:
R(T)=R25*e{B*(1/TX – 1/T25)}
2.8.1 Thermistore Curves
(Fig.2.4)

2. PRINT HEAD
MT002 2-6
Blankpage

3. STEPPER MOTOR
MT0023-1
3.1STEPPERMOTOR
The paper feed pitch for stepper motor is 2 steps for one dotline(1).
(1) Note: 1 dotline = 0.125 mm.
3.1.1 Technical specifications
Item Specification
Drive voltage DC 5.5 V
No. of phases 2
Drive mode Bipolar drive
Step angle 18° ± 2°
Rated current 350 mA / Phase
Resistance 12Ω± 7% at 25 °C (each phase)
Inductance 3.7 mH ± 25% at 25°C (1kHz. 1Vrms )
Holding torque 33.7 gf-cm MIN
Pull-out torque (1200 pps) 13.3 gf-cm MIN
Insulation resistance 100 MΩMIN (500 Vdc)
Insulation class Class E
Dielectric strength AC 500V 1 min.
Life 3000 Hr min.
Maximum coil temperature 115°C
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.3.1)
(Tab.3.2)

3. STEPPER MOTOR
MT002 3-2
(PH2B)
(PH1B)
(PH1A)
(PH2A)
H
L
H
L
H
L
H
L
1
dot line
STEP1 STEP2 STEP3 STEP4
ExcitationVoltageWaveforms
3.2PRECAUTION
1. Drivethe motor with mosfetdriver to obtain themaximumtorque force insteadtransistordriver , transistor
driverlosevoltageVCEsat*2.
2. Please check the ratioprint/pausetoprevent the overtemperature on steppermotor.
3. If the motor is driven by more than 5 volts we suggest to use a chopper driving, in order to reduce
current,pleasecontactCUSTOMENGINEERINGSPA forfurther information.
(Fig.3.1)

4. SENSOR
MT00214-
4.1SENSOR
Maximum Ratings (Ta= 25°C)
Parameter Symbol Rating Unit
Power dissipation PD75 mW
Reverse voltage VR5V
Forward current IF50 mA
Input
Pulse forward current (1) IFP 1A
Collector power dissipation PC50 mW
Collector current IC20 mA
Collector-emitter voltage VCEO 30 V
Output
Emitter-collector voltage VECO 3V
Operating temperature range TOPR -20 ~ 85 °C
Storage temperature range TSTG -30 ~ 100 °C
(1) NOTE: Pulse width
≤ 100 μ s, Repetitive frequency = 100 Hz.
Opto-electrical characteristics (Ta=25°C)
Parameter Symbol Conditions MIN. TYP. MAX. Unit
Forward voltage VFIF = 10 mA --1.3V
Reverse current IRVR = 5 V --10
μA
Input Peak emission
wavelength λPIF = 10 mA - 940 - nm
Collector dark
current ICEO VCE = 10 V --0.2
μA
Output Peak sensibility
wavelength λP- 900 - nm
Light current ILVCE = 5 V, IF = 10 mA 90 - - μA
Leakage current ILEAK VCE = 5 V, IF = 10 mA --0.2
μA
Rise time tr-30-μs
Switching
speeds Fall time tf
VCC = 2 V, IC = 0.1 mA
RL = 1 KΩ-25-μs
(Tab.4.1)
(Tab.4.2)

4. SENSOR
MT002 24-
4.2GRAPHICS OF TYPICAL CHARACTERISTICS
Collector Power dissipation vs. Ambient Temperature
(Fig.4.1)
(Fig.4.2)
Forward Current vs. Forward Voltage