Dualopto Pc Board; Sensor Circuit - Bayer HealthCare RapidPoint 400 Series Service Manual

Dualopto PC Board

The two Dualopto PC boards provide the luer position mechanism a way to
determine where the valve actuator is located for the measurement and
AutomaticQC valves. Two optical interrupter switches accomplish this
task.

Sensor Circuit

All signals arrive from the main board through a 4-pin, male, IDC
connector, J1. The two LEDs inside the interrupters, U1 and U2, connect
in series and can be checked at test points TP3(+) and TP4(-) for a voltage
of approximately 2.5V.
The output signals from each interrupter route to J1 and to test points
TP1 (LUER_POS1) and TP2 (LUER_POS2), respectively. Their voltage
levels are approximately 0.5V for the unblocked condition and
approximately 4V for the blocked condition. All voltages are measured
with respect to ground TP4.
82 Rev. C