Seiko Instruments LTP F Series manual 5

		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

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