2-7
2.6 Functions
2.6.1 2.6.1 Sensors
(1) Head Temperature Detection: Detects the temperature of the thermal head with a thermistor.
(2) Paper Out Detection: An embedded photosensor in the paper insertion unit paper
guide of the thermal mechanism detects the trailing edge of the
paper.
(3) Cover Open Detection: Detects that the cover (between Head and Platen) is closed.
(4) Near-end Sensor : A reflective type photosensor detects the remaining amount of
paper on the roll.
The following shows the detecting diameter and the amount of paper remaining on the roll for each
condition. The values in the table are approximated.
Paper
Thickness
(µm)
For Inner Diameter. Ø12/Outer Shape Ø18
Shaft Core Roll Paper
For Inner Diameter Ø25.4/Outer Shape Ø32
Shaft Core Roll Paper
Detection Diameter Remaining Amount Detection Diameter Remaining Amount
(mm) (m) (mm) (m)
Level
1
Level
2
Level
3
Level
1
Level
2
Level
3
Level
1
Level
2
Level
3
Level 1
Level
2
Level
3
65
2.5 4.9 7.7 2.8 6.4 10.4
75
Ø23 Ø 27 Ø 31
2.1 4.2 6.7 2.4 5.5 9.0
85
2.1 4.9 7.9
95
1.9 4.4 7.1
105
1.7 4.0 6.4
130
1.4 3.2 5.2
150
Ø 36 Ø 40 Ø 44
1.2 2.8 4.5
<Note>
1) The ex-factory setting is level 1.
2) These values are calculated for sensor diameter and residual paper amounts, so there may be
some differences caused by paper take-up state, paper thickness, the mechanism and print pattern.
3) If the paper is particularly thick, the roll paper itself will become loose. It is recommended that level
3 be used to increase size of the above dimension.
4) The TSP743-24 series can be set in 3 levels, but when used in a vertical layout, it is fixed at level 3.
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