JLG 740AJ Service Manual - Manual (Page 280)

SECTION 4 - BOOM & PLATFORM
4-64 – JLG Lift – 3121160
UMS Sensor Not Calibrated Message
8/1 UMS SENSOR NOT CALIBRATED
If the control system detects a sensor out of range condi-
tion or a not calibrated fault with the UMS angle sensor,
the control system shall report a fault and disable Tower
Lift Down and activate the ground boom malfunction indi-
cator lamp, upright tilted lamp and platform alarm continu-
ally.
If the control system detects that either angle sensor has
not been calibrated, the ground boom malfunction lamp
will flash at a 3 Hz rate until the system is calibrated or dis-
abled.
Solution:
• Calibrate sensor.
UMS Sensor Faulted
8/1 UMS SENSOR FAULTED
If the system detects that the UMS sensor frequency out-
side the 100Hz +/- 5Hz range or the duty cycle is outside
50% +/- 21% range the control system shall report a fault.
Solution:
• Inspect wire harness going to the sensor and UMS
module.
• Inspect sensor mounting.
• Replace sensor.
Tower Lift Down Output Short to Ground or
Open Circuit
8/1 TOWER LIFT DOWN OUTPUT SHORT TO GROUND
OR OPEN CIRCUIT
Short to Ground or open circuit has been detected on the
Tower Lift Down output.
Solution:
• Inspect harness and valve.
Tower Lift Down Output Short to Battery
8/1 TOWER LIFT DOWN OUTPUT SHORT TO BATTERY
Short to battery has been detected on the Tower Lift Down
output.
Solution:
• Inspect harness and valve.
Platform Indicator Output Short to Ground or
Open Circuit
8/1 PLATFORM INDICATOR OUTPUT SHORT TO
GROUND OR OPEN CIRCUIT
Short to Ground or open circuit has been detected on the
Platform Indicator output.
Solution:
• Inspect harness.
Platform Indicator Output Short to Battery
8/1 PLATFORM INDICATOR OUTPUT SHORT TO BAT-
TERY
Short to battery has been detected on the Platform Indica-
tor output.
Solution:
• Inspect harness.
Ground Indicator Output Short to Ground
8/1 GROUND INDICATOR OUTPUT SHORT TO GROUND
OR OPEN CIRCUIT
Short to Ground or open circuit has been detected on the
Ground Indicator output.
Solution:
• Inspect harness.
Ground Indicator Output Short to Battery
8/1 GROUND INDICATOR OUTPUT SHORT TO BATTERY
Short to battery has been detected on the Ground Indica-
tor Output.
Solution:
• Inspect harness.
Turntable Sensor Not Calibrated Message
8/1 TURNTABLE SENSOR NOT CALIBRATED
If the control system detects that the Chassis Tilt sensor is
not calibrated or there is an internal fault with the sensor,
the control system shall disable Tower Lift Down and acti-
vate the ground boom malfunction indicator lamp, upright
tilted lamp and platform alarm continually.
If the control system detects that either angle sensor has
not been calibrated, the ground boom malfunction lamp
will flash at a 3 Hz rate until the system is calibrated or dis-
abled.
Solution:
• Calibrate sensor.