8-1
CHAPTER 8
DESIGNING AND HANDLING PRECAUTIONS
To maintain the initial level of performance of the LTP3445 and to prevent future problems from
occurring, observe the following precautions.
8.1 DESIGN PRECAUTIONS
➀
Do not apply an energy source that is too high.
If too much energy is applied to the thermal head, it may overheat and become damaged.
Always use the printer with the specified energy.
➁
When turning the power on or off, always disable (put in low state) the DST terminals.
➂
To prevent the thermal head from being damaged by static electricity:
•
Connect the FG connector (see Figure 6-1) to the FG
•
Connect the GND terminal of the thermal head control FPW to FG through an approximately 1 M
Ω
resistor.
➃
Keep the V
P
power off while not printing in order to prevent the thermal head from being
electrolytically corroded.
In addition, design the printer so that the signal GND of the thermal head and the frame GND of the
printer mechanism become the same electric potential.
➄
Make the wire resistance between the power supply and the V
P
and GND terminals on the FPW as
small as possible (below 50 m
Ω
) .
➅
For noise detection, connect a capacitor near the FPW connector.
V
P
-GND
approximately 10
µ
F capacitor
V
dd
-GND
approximately 1
µ
F capacitor
Содержание LTP3445
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