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Timing
Chart
TXD from RP-K100
ON LINE from RP-K100
\
.__ ______________
__,/
\
_______
_
r-----------
STB
from RP-K100
ACK to RP-K100
10.2.5 Thermal head
Drive
Circuit
The thermal head on the KX-W50TH/KX-W60TH is composed of 28 dot shaped resistors.
When the current flows through the resistor, the resistor functions as a heating element.
When printing, 24 of the 28 dots are used. When correcting, all 28 dots are used.
The thermal
head
drive circuit receives its signals from the Gate Array (IC104).
These signals (25 bits) are fed to the driver (IC108,
IC109,
IC110 and IC111) which is a M54537.
This driver contains 7 NPN Darlington transistors
.
Since a character font
is
determined by the dot matrix, the signals are synchronized with the Carriage Motor
timing
and they
are
sent to the thermal head, as a result, a character is printed.
The head press solenoid on the KX-W50TH/KX-W60TH is a latch type plunger solenoid
.
This solenoid,
dur
-
ing
printing,
places the thermal
head
on the paper, and at return,
lifts
the thermal head off the paper. This
solenoid is driven by a bi-directional driver
(IC112)
which is a M54544L
.
This solenoid drive circuit receives
its signals from HEUP-HEDW of
IC104.
The signal from CORH of IC104
is
H level only during correction
.
In
the sequential timing of the software, the head press solenoid first places the thermal head against the
paper,
then
the Carriage Motor moves along the shaft, next the printing signals are sent to the thermal head.
C
Circuit
Diagram
IC104
Gate
Array
CORH
H
1
H
2
H
3
H
4
H 5
H
6
H
7
H
8
H 9
H10
H11
H12
H13
H14
H15
H16
H17
H18
H19
H20
H21
H22
H23
H24
M54537
x 4
CN109
~~F!_M_!.1- __ lj_~AD
n-~~
I
<Du
IC108
I
L
2
1
'@
1
A."••
IC109
12--_1
57
(3l
1-----------------,
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1
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27
26
25
24
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5
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---+-------------------1---
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23
21
20
19
18
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16
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12
11
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1------
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5
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1
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s"'»---..-"A·"'.·"'.y-+
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HEUP
80
IC108 1 ~
6
IC110
....,
lb
J
:/\:A:
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HEDW
79
~
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:
---~ G
I
L ________
J
+VH-
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T,7
-30-
-31-
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