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Chapter 2 Operating Principles
2-2. Operation of Control Parts
CL-S700/CL-S703/CL-S700R 2-20
2-2-3. Sensors
(1) Top cover open sensor
The top cover open sensor is used to detect the open/close status of the top cover. This sensor
uses a photo interrupter.
When the top cover is closed, the claw of the top cover is engaged with the photo interrupter
(top cover open sensor). In this case, light emitted from the LED of the photo interrupter is
blocked by the claw and the phototransistor turns OFF. As a result, pin 173 (CV_OPN) of U1
(CPU) goes "High".
When the top cover is opened, the claw is released from the photo interrupter and pin 173
(CV_OPN) of U1 (CPU) goes "Low".
When the top cover is opened, the ERROR LED blinks and the LCD displays “ERROR
COVER OPEN” on the operation panel.
Claw
SA, Cover Open Sens
(Photo interrupter)
Top Cover
+3.3V
R190
R191
J403
+5V
1
[Main PCB]
CV_OPN
U1 CPU
P75
173
C113
19
22
Cover Open Sensor
1
[Ope-pane PCB]
2
3
4
22
4
1
J401
J14
R406