LTPH245 datasheet(9/64 Pages) SII

9 / 64 page

1-2

1.2

DESIGN AND HANDLING PRECAUTIONS

To maintain the initial level of performance of the printer and to prevent future problems from occurring,

observe the following precautions.

1.2.1

Design Precautions

If too much energy is applied to the thermal head, it may overheat and become damaged.

Always use the printer with the specified amount of energy.

Do not apply a pulse of 2V and 20 nsec or higher to each signal terminal of the thermal head.

Use C-MOS IC chips (74HC240 or equivalent) for interfacing the CLK, LATCH, DAT and DST

signals of the thermal head.

When turning the power on or off, always DISABLE (put in “Low” state) the DST terminals.

To prevent the thermal head from being damaged by static electricity:

•

Fix the printer to the Frame Ground (FG) with the FG connector as shown in Figure 7-2.

•

Connect the GND terminal (SG) to FG through 1 M

Ω resistor so that the electric potential

of the SG of the thermal head and the FG of the printer are equal.

Keep the Vp power off when not printing to prevent the thermal head from becoming

electrically corroded.

Wire resistance should be 50 m

Ω or less (however the less the better) between the power

supply and the Vp, and the GND terminals on the thermal head controller.

Maintain a

considerable distance from signal lines to reduce electrical interference.

The surge voltage between Vp and GND should not exceed 10 V.

As a noise countermeasure, connect the capacitor noted below between the Vdd and GND

terminals near the thermal head control connector.

↔ GND:

approximately 10

µF

Vdd

↔ GND:

approximately 1

µF

When turning the power on or off, perform the Vp and Vcc simultaneously or in the order of 1)

and 2) as follows:

At power ON:

1) Vcc (5 V)

→ 2) Vp

At power OFF:

1) Vp

→

2) Vcc (5 V)

Always monitor the output of the platen position sensor and paper detector. Incorrect

activation of the thermal head may damage and reduce the longevity of the thermal head and

the platen.

Design the outer case so that the paper detector is not affected by light from outside. Since a

reflection type photo interrupter is used in the paper detector, the detector may be affected by

light from outside.

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