Seiko Instruments LTP F Series User Manual
Page 5
v
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