173Service Manual – SC5000 30 - Solution System
3. Check the voltage between pins 1 and 2 of the X190 connector for 5 volts.
• If 5 volts is not present, repair or replace the wiring between the controller and connector.
• If 5 volts is present, replace the sensor.
Symptom: The controller always reports a full tank regardless of the actual level.
1. Disconnect the sensor at the X190 connector, and check if the condition remains.
• If the condition clears, replace the sensor.
• If the condition persists, repair/replace the harness between the controller and the X190 connector.
Symptom: The Controller reports the tank has more solution than actual. (The service Menu never displays
less than 0.25 volts or 2.5 mA even when the tank is empty.)
• One of the sensor bodies has failed and the whole sensor group must be replaced.
• In preparation for replacing the sensor, remove the recovery tank. If no obvious conductive obstruction is
found in proximity to any of the sensor bodies, then replace the sensor.
Symptom: The Controller reports the tank has less solution than actual. (The service Menu never displays
more than 0.55 volts or 5.5 mA even when the tank is full.)
• One of the sensor bodies has failed and the whole sensor group must be replaced.
• In preparation for replacing the sensor, remove the recovery tank and manually test each sensor to
conrm the diagnosis. If no obvious conductive obstruction is found in proximity to any of the sensor
bodies, then replace the sensor.
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