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10.2.11 Sensor Circuit
(1) The home sensor detects the carriage home position
,
when the power switch is turned ON. The number
of steps from the home position determines the physical printing position. Home position detection is
performed by a mechanical switch (SW502). When the carrige come to the home position, SW502 is
closed
;
(KX-W50TH) pin
@
of IC104 chaneges from L to H. At this time, P55 of the CPU is at H level.
(KX-W60TH) P55 of the CPU is directly L level.
(2) The paper out sensor detects the paper out condition
.
The paper out sensor uses a photo-reflector (OPT). When the paper comes to the end, the reflected
light of the LED is cut off and the photo-transistor is turned off. And pin
@
of IC104 changes from L to
H.
At the same time
,
P54 of the CPU becomes H level.
(3) The weak battery detection informs when it is time to replace weak battery.
When the battery voltage is
high,
voltage of pin
@
(IC104) is higher than threshold level
,
pin
@
(IC104)
is at H
level,
the weak battery indicator on the LCD is turned off. When the battery voltage is low, voltage
of pin
@
(IC104) is lower than threshold level, pin
@
(IC104) is at L level
,
the weak battery indicator
is turned on.
Turn over voltage of the battery is about 4.2V.
When the battery voltage is low, the weak battery indicator will be ON at times of high voltage use and
OFF when power use is low, finally it will remain ON when the batteries are dead
.
Circuit Diagram
(KX-W50TH)
IC101
IC104
+
5V
CPU
Gate Array
R113
CN104
P55
22
49 P55
40
R103
HOME
rC101
Home Sensor
1
I
SW502
CN105
r-,
1
I
+
5V 1r-7
r---7
P54 21
48 P54
35
PASN
1
1
I
Paper out
l-"--"---..--~-----=
2 ::- I
-0--1-<
1
~
.....
1 _,,..,
i
Sensor
P20
9
46 P20
36
>-'---------'-"'-'
BA TT
JC130
R105
P23i.:-12=-------+---.!.-l7
IC111
R121
+
R120
C109
-38
-
I
I
I
I
31
CN112
r-7
1 I
I
I
I
I
I
I
31 I
L
_
_j
IOPT
I
I
I
I
I
L
_
__
_J
- BATTERIES
Circuit Diagram
(KX-W60TH)
IC101
CPU
+
5V
R113
CN104
,--,
p
55
F2=2 _______
..,____.:._R~1N0~3_1~1-o-~1
~
Home Sensor
1
I
I
SW502
CN105
IC104
Gate Array
+5V 1r-7
r---7
I
21
p
54 21
48 P54
35
!=--'--~
PASNf-=-----------
l
Paper out
1 Sensor
IOPT
P 2 0 i.::9
'------'-
4 :iP20
36
BATT
IC130
R105
7
P23~ 1
=
2
------4---
IC111
R121
+
R120
C109
-39-
I
I
I
I
I
I
I
I
I
,.c..+-~f---+---'
I
L ___
J
31
L _
_l
CN112
r-7
11
I
I
i I
I
I
I
I
3
I
I
L _
_J
-=-
B ATTERIES
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