TDP-643R PLUS BAR CODE PRINTER
SERVICE MANUAL
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3.5 Sensor & key
Fig. 3.5 Semsor & Key Circuit Diagram
A.
JP1 is the connector which connects to the LEDs and Keys.The signal of LED is High
when the LED is bright; otherwise, it is low.
The signal of the key is low when the keys is press; otherwise, it is high.
B.
JP2 is the connector which connects to the gap sensor.
The gap sensor is a penetrable sensor. the gap sensor signal voltage is low when the
gap is detected; otherwise, it is high.
C.
JP4 is the connector which connects to the gap emitter level, the gap level is a emitter
source intensity control signal. It is a PWM signal.
Memory card
connector
Memory card
connector
