ELCOM Euro-500 Handy Series, Руководство по обслуживанию

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Euro-500TX Handy © Elcom, s. r. o.
Service manual
27
3 Thermal printer LT1320
3.1 Basic specification
Printing method thermal dot printing
Total number of dots 576 per row
Dot density 8 dots per mm
Printing width 72 mm
Tape feed step 0.125 mm
Printing speed 640 dot lines per second maximum
Sensor functions head temperature – thermistor
paper tape sensor – photoconductive detector
head position sensor – photoconductive detector
Operating voltages VH – DC 24 V ± 10 %
VCC1 – DC 5 V ± 5 %
Current consumption printing head (VH) 5.2 A maximum
motor (VH) 0.41 A maximum
Recommended tape width 2×38 mm
Paper tape thickness 60–150 g/m
2
Paper feed force 0.98 N and more
Paper hold force 0.98 N and more
Head life expectancy 50,000,000 pulses (print density 12.5 %) and more or 50 km or
more in tape length
Operational temperature range 0 to 45 °C
Storage temperature range -20 to +60 °C
Operational humidity range 35–85 % RH
Storage humidity range 10–90 %
Dimensions 108(W) × 58 (L) × 20(H) mm
Weight approx. 99 g
3.2 Thermal head
3.2.1 Thermal head composition
The thermal printing head consists of thermal elements and their head controller as shown in the Fig. 3.1.
The serial data carried by the DATA IN signal are transferred into the feeding register synchronously with
the CLOCK signal and stored in the storage register using the LATCH signal. Head activating signals STB1
to STB4 switch the gates and activate the thermal elements according to the stored data.
VH
GND
STB4
STB3
STB2
STB1
LATCH
DATA IN
CLOCK
DATA OUT
VCC1
TS
TS
Thermal unit
Storage register
Feeding register
Thermistor
Fig. 3.1 Thermal head connexion