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TABLE OF CONTENTS
Section Page
CHAPTER 1 PRECAUTIONS
1.1 SAFETY PRECAUTIONS ..................................................................................................... 1-1
1.2 DESIGN AND HANDLING PRECAUTIONS ......................................................................... 1-2
1.2.1 Design Precautions .................................................................................................. 1-2
1.2.2 Handling Precautions ............................................................................................... 1-5
1.2.3 Precautions on Discarding ....................................................................................... 1-6
CHAPTER 2 FEATURES
CHAPTER 3 SPECIFICATIONS
3.1 GENERAL SPECIFICATIONS .............................................................................................. 3-1
3.2 HEAT ELEMENT DIMENSIONS........................................................................................... 3-3
3.2.1 Heat Element Dimensions for the LTPF247............................................................. 3-3
3.2.2 Heat Element Dimensions for the LTPF347............................................................. 3-4
3.3 PAPER FEED CHARACTERISTICS..................................................................................... 3-5
3.4 STEP MOTOR CHARACTERISTICS ................................................................................... 3-6
3.4.1 Motor Drive Circuit.................................................................................................... 3-7
3.4.2 Motor Timing ............................................................................................................ 3-9
3.4.3 Motor Driving Precautions...................................................................................... 3-10
3.5 THERMAL HEAD ................................................................................................................ 3-14
3.5.1 Structure of the Thermal Head (LTPF247)............................................................. 3-15
3.5.2 Printed Position of the Data (LTPF247) ................................................................. 3-16
3.5.3 Thermal Head Electrical Characteristics (LTPF247).............................................. 3-17
3.5.4 Structure of the Thermal Head (LTPF347)............................................................. 3-18
3.5.5 Printed Position of the Data (LTPF347) ................................................................. 3-19
3.5.6 Thermal Head Electrical Characteristics (LTPF347).............................................. 3-20
3.5.7 Timing Chart........................................................................................................... 3-21
3.5.8 Head Resistance.................................................................................................... 3-21
3.5.9 Head Voltage.......................................................................................................... 3-22
3.5.10 Peak Current .......................................................................................................... 3-22
3.6 CONTROLLING THE HEAD ACTIVATION (DST) PULSE WIDTH.................................... 3-23
3.6.1 Calculation of the Head Activation Pulse Width..................................................... 3-23
3.6.2 Calculation of the Applied Energy .......................................................................... 3-23
3.6.3 Adjustment of the Head Resistance....................................................................... 3-24
3.6.4 Head Activation Pulse Term Coefficient................................................................. 3-24
3.6.5 Heat Storage Coefficient ........................................................................................ 3-25
3.6.6 Thermistor Resistance ........................................................................................... 3-26
3.6.7 Detecting Abnormal Temperatures of the Thermal Head ...................................... 3-28