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OPERATING PRINCIPLES
Rev. B
2-2
3
Each sensor is described below.
1. Front and rear paper end sensors
Detection form: Photo interrupter
Output form: Open collector (pulled up to 10 K ohms resistor)
Logical: Paper present: LOW
Paper out: HIGH
2. Top paper end sensor (to detect the TOF position)
Detection form: Photo reflector
Output form: Open collector
Logical: Paper present: LOW
Paper out: HIGH
3. Paper jam sensor
Detection form: Magnetic transistor
Output form: Rectangle wave (1 channel, TTL level)
Logical: Paper feed: Level changes continuously.
Paper jam: Level remains the same.
Supplement: The magnetic transistor is attached to the tension roller on the paper tension unit.
4. Tractor select sensor
Detection form: Micro mechanical switch
Logical : Front tractor: LOW (closed)
Rear tractor: HIGH (open)
5. Pull tractor sensor
Detection form: Micro mechanical switch
Logical : Pull tractor installed: LOW (closed)
Pull tractor not installed: HIGH (open)
6. Carriage encoder sensor
Detection form: Photo reflector
Transaction: Rectangle wave, A and B phases respectively.
7. Platen Gap encoder sensor
Detection form: Photo interrupter
Output form: Rectangle wave, 2 channel
PG ability: T = 0.015 mm / pulse
Available range: 0 < T <
0.7 mm
8. Platen Gap home position sensor
Detection form: Micro mechanical switch
Logical:: Home: LOW (closed)
Out of home: HIGH (open)
9. Ribbon jam sensor
Detection form: Photo interrupter
Function: : The main board monitors signal change during ribbon feed.
10. Cover open sensor
Detection form: Micro mechanical switch
Logical:: Cover closed: LOW
Cover open: HIGH
11. Printhead temperature sensor (uses a thermistor)
The thermistor is included on the printhead.
12. Head fan temperature sensor (uses a thermistor)
The thermostor is included on the head fan.