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+5V line
+24V line
A
(+25V)
RI
)
R2
ControlSignal+
*
Icl
Drive signal+
R1 : 10KQ, l14W
' ,
R2 : 2,2K!2, I14W
---
'
R3 : IKf?, I14W
ICI : SN74LS05
(Open collectorcircuit)
GND
Fig.
8-3 Circuit to control
drive circuit (example)
8.2 Carriage Motor Protection Method (Against Mechanical Errors)
If the carriage motor gets locked as a result of trapping foreign matter, etc. in the printer mechanism,
a risk of damaging the motor due to flow of excess current to it is generated. Therefore, it becomes
necessary to monitor the excess load status of printer mechanism, by detecting the cycle of timing
signal 1 with timer, etc. Once the cycle of timing signal 1 becomes as given below, stop power being
supplied to the motor.
a.
Print interval: 2ms or more/450~ms or less
b.
Outside print interval: 200ms or more
8.3 Other Notes
1.
2.
3.
4.
5.
6.
Do not attempt to print when the paper or ribbon cartridge are not loaded in the
mechanism as this could damage the print head.
Do not store or use the printer mechanism at places of substantial dust, iron content,
in oily atmosphere.
printer
etc., or
Wipe off dust, dirt, etc. from the printer mechanism, using a soft brush. Or, wipe with a piece
of cloth dampened in alcohol.
Never inflict strong force on the printer mechanism. Otherwise, the frame or other parts may
be distorted, rendering normal functioning impossible.
Avoid sudden changes in the ambient conditions like, temperature, humidity, etc. even while
they are held in prescribed limits. If sudden change occurs, allow about 30 minutes for
acclimatizing, before using the printer mechanism.
Never use the printer mechanism with condensation deposited onto it.
-34-
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