Seiko LTP F Series Specifikace stáhnout pdf (Strana 47)

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3.7 PAPER DETECTOR

The printer has a built-in paper detector (reflection type photo-interrupter) to detect whether paper is

present or not.

An external circuit should be designed so that it detects the output from the paper detector and does

not activate the thermal head when there is no paper. Doing not so may cause damage to the thermal

head or platen roller or shorten the life of the thermal head significantly.

3.7.1 General Specifications

Table 3-13 Absolute Maximum Ratings of the Paper Detector (at 25°C)

Item Symbol Maximum Rating

Forward current I

50 mA

Reverse voltage V

5 V

LED (input)

Allowable current P 75 mW

Collector-to-emitter voltage V

CEO

20 V

Emitter-to-collector voltage V

ECO

5 V

Collector current I

20 mA

Photoransistor

(output)

Collector loss P

70 mW

Operating temperature T

opr

-20 to +80°C

Storage temperature T

stg

-30 to +100°C

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 85 86

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Seiko LTP F Series Specifikace Strana 47