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W450769A 01/14
3.7.2 Checking the Extension Sensor Drive Voltage
1. Remove the Reeling Drum cover.
2. Use a digital voltmeter to measure the voltage between the RED (TB1-4) and BLUE (TB1-1)
wires at the terminal block mounted on the sensor baseplate assembly.
3. Ensure the voltage is between 4.7 and 5.3 volts.
NOTE: Voltages outside the range specified indicates a connection problem between the Reeling Drum
and the computer or, a short circuit within the Reeling Drum. Check the Reeling Drum wiring within the
reel and at connector j305.
3.7.3 Checking the Boom Extension Sensor Voltage
1. Fully retract the boom.
2. Remove the Reeling Drum cover.
3. With a digital voltmeter, measure the voltage between the BLUE wire (TB1-1) and the WHITE
wire (TB1-3).
4. With the boom fully retracted, the voltage should be between 0.1 and 0.3 volts. If the voltage is
incorrect, refer to
CHAPTER 2 - CALIBRATION
.
5. Measure the voltage at TB1-1 and TB1-3, extend the boom out and ensure the potentiometer is
operating by verifying the voltage increases.
FIGURE 3.7.3 - SENSOR BASEPLATE ASSEMBLY WIRING
