| Electrical Precautions |
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(1) |
Circuit should be designed to shut down VH (heater voltage) to GND level during
stand-by mode in order to avoid damage to printhead by ion, noise, etc. |
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(2) |
When the number of simultaneously printing dots exceeds the limit of the printhead,
applied power per heater element will be reduced due to the power loss in the
circuit pattern of the printhead, and sufficient optical density will not be obtained.
Also, the increased current may cause noise problem. Therefore it is recommended
to take sufficient countermeasures against noise. |
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(3) |
Circuit should be designed so as to stop printing to avoid overheating when
thermistor is damaged. |
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(4) |
Each wiring resistance and length from VH and GND to the printhead is recommended
to be less than 10mΩ and 100cm. Also the power supply line is recommended
to be kept away from the signal line so as not to produce any electrical interference. |
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(5) |
Signal inputs of CLOCK, LATCH, DATA, and STROBE should be interfaced by C-MOS
(74HC240) or equivalent. |
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(6) |
An electrolytic aluminum capacitor of 15V and 33μF level should be placed
between VDD and GNDL to avoid noise. |
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(7) |
Power on sequence should be in the order of VDD first and VH next. Power off
sequence should be in the reverse order of VH first and VDD next. (STROBE signal
should be disabled when power supply is turned on or off.) |
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| Mechanical precautions |
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(1) |
Platen shaft shall be designed not to have a bend and rubber thickness is
recommended to be more than 2.0mm. |
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(2) |
When local platen pressure is higher than the limit, the life of the printhead
is shortened. Appropriate mechanical design is required to have an even pressure
across the paper width. |
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| Handling precautions |
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(1) |
Substrate temperature should not exceed the maximum limit when continuously
printing at a high duty to avoid breakdown of heater elements. |
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(2) |
Paper residue on heater line should be removed with ethanol or IPA to avoid
corrosion. |
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(3) |
Do not touch the heater line surface with bare hand to avoid corrosion. |
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(4) |
Please use a thermal paper and an ink-ribbon that are free from Na+, K+, and
CI- ions and of which reliability is fully evaluated to avoid corrosion. |
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(5) |
Heater surface should be free from any condensation to avoid corrosion. In
case condensation is found, please turn off the VH until condensation evaporates. |
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| Related link |
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| Related site |
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| New product |
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