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3.7.6 Checking the Angle 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 indicate a connection problem between the Reeling Drum
and the computer or a short circuit within the Reeling Drum. Check Reeling Drum wiring within the reel
and at the boom foot base connector.
3.7.7 Checking the Angle Sensor Voltage
1. Using an inclinometer for verification, place the main boom at a 0° angle; then remove the
Reeling Drum cover.
2. Use a digital voltmeter to measure the voltage between the blue wire (TB1-1) and the green
wire (TB1-2). With the boom horizontal, the voltage should be between 0.3 and 0.5 volts. If the
voltage is incorrect, refer to
Chapter 2 – Menu 04 – Angle Sensor
.
3. Measure the voltage at TB1-1 and TB1-2, move the exposed side of the angle sensor pendulum
downwards, and ensure the potentiometer is operating by verifying the voltage increases.
Ensure the pendulum moves freely and when released falls smoothly back to the original 0°
(zero) voltage reading.
3.7.8 Reeling Drum Replaceable Parts
The following parts of the Reeling Drum are field-replaceable:
•
Extension/Reel-Off Cable Assy
•
Slip-Ring Assembly
•
Sensor Baseplate Assembly
•
Cable Tail Assembly (Signal Cable)
•
Reeling Drum Cover
The spring chamber/Reeling Drum surface and shaft assembly are not replaceable in the field. Failure
of the recoil spring, damage to the shaft or reel surface and side plates requires complete replacement
of the Reeling Drum.
