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Trouble Shooting Reflection IR Sensor Lamp Current Failure on Smart Platform
This failure can be due to a failed lamp, transformer, safety circuit, chiller flow failure,
cable or connection failure, Sola transformer, the sensor it's self, or ECS board
The most probable cause is a failed source lamp or over temperature condition.
1. If the Lamp Voltage, as shown on the Service Work Station health page for IR shows
12 volts, but current is zero, replace the lamp if the sensor head has an access port,.
Click Here for TID 7-12, IR Sensor Source Lamp Replacement. If the sensor does
not have and access port, replace the sensor.
2. If the Lamp Voltage, as shown on the Service Work Station health page for IR shows
no voltage, check that the RPS/Head rotation as shown on the Service Work Station
health page for IR shows the correct Rotation per Second (RPS), 50/60. This
indicates that AC power is getting to the sensor.
3. If RPS is zero Click Here to trouble shoot loss of logic pulses from the head.
4. If RPS shows rotation, and the lamp voltage is zero, it is possible that the over
temperature safety circuit is set. Reset the temperature protect circuit. Turn the IR
circuit breaker off for a few seconds then turn it back on, if the lamp now has current,
the sensor has experienced an over temperature condition. This can be due to coolant
flow low, or high temperature of the coolant. In some cases this is due to extremely
high ambient temperatures.
5. If RPS show rotation, the lamp voltage is zero, and resetting the temperature protect
circuit doesn't bring the lamp current back, assure 120 protected is getting to the IR
transformer. Measure 120 VAC on J21 Pin 6, on the carriage board. (J7 if SP700) If
120 VAC is not present, and the sensor is not in an overheated condition, check the
pigtail from the carriage board to the sensor using the appropriate functional drawing.
If the pigtail is ok, the safety circuit is in the source head is defective, the sensor will
have to be replaced. .
Click Here TID on IR pigtail failures
Click Here for SP1200 and Reflection Scanner pigtail part numbers.
Click Here
6. If RPS shows rotation, the lamp voltage is zero, resetting the temperature protect
circuit doesn't bring the lamp current back, and 120 VAC is present at J21 Pin 6, (J7
if SP700) replace the IR transformer on the carriage board.
Revised February 4, 2005
GB
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