JLG 800A_AJ Service Manual - Manual (Page 380)

SECTION 6 - JLG CONTROL SYSTEM (S/N 0300065534 TO PRESENT)
6-48 – JLG Lift – 3120858
2/3 Flash code 2/3 indicates problems with boom function selection. 3
LIFT/SWING LOCKED – JOYSTICK
MOVED BEFORE FOOTSWITCH Platform upper lift or swing was selected before and during footswitch closure.
PUMP SWITCHES FAULTY – CHECK
DIAGNOSTICS/BOOM A boom function (lower lift, telescope, basket level, basket rotate, jib) has both direc-
tions selected together.
PUMP SWITCHES LOCKED –
SELECTED BEFORE FOOTSWITCH A platform boom function (lower lift, telescope, basket level, basket rotate, jib) was
selected before key switch or footswitch closure.
PUMP SWITCHES LOCKED –
SELECTED BEFORE AUX POWER A ground boom function (lower lift, telescope, basket level, basket rotate, jib) was
selected before aux power.
LIFT / SWING WITH NO QPROX This fault only occurs with inductive joysticks. It occurs if the joystick is moved out of the
neutral position with no Qprox sensors active.
l/s joy. qprox bad These faults only occur with inductive joysticks. They indicate that the Q-Prox sensor is
reading above 3.18 volts.
l/s joy. out of range low Resistive joysticks: These faults do not occur.
Inductive joysticks: The trigger points for these faults are dependent on the centertap
voltage reading. These faults will be triggered when the voltage is less than the centertap
voltage minus half the center tap voltage minus 0.3 volts. If the centertap is at the high
end of the range, these faults will be triggered below 1.05 volts. If the centertap is at the
low end of the range, these faults will be triggered below 0.79 volts.
l/s joy. out of range high Resistive joysticks: These faults do not occur if the Vref voltage is below 8.1 volts. If Vref
is above 7.7 volts, Vref is operating out of tolerance or a short to battery has occurred.
Inductive joysticks: The trigger points for these faults are dependent on the centertap
voltage reading. These faults will be triggered when the voltage is more than the center-
tap voltage plus half the centertap voltage plus 0.3 volts. If the centertap is at the high
end of the range, these faults will be triggered above 4.35 volts. If the centertap is at the
low end of the range, these faults will be triggered above 3.8 volts.
l/s joy. center tap bad Resistive joysticks: These faults occur when the center tap voltage is not between 3.08
volts and 3.83 volts. Due to resistor tolerances there is a +/-.1 volt range around these
values where the fault may be indicated.
Inductive joysticks: These faults occur when the center tap voltage is not between 2.18
volts and 2.70 volts. Due to resistor tolerances there is a +/-.1 volt range around these
values where the fault may be indicated.
PUMP SWITCHES LOCKED –
SELECTED BEFORE START
SWTICH This fault occurs when a hydraulic function switch is closed before the start switch is
closed.
FOOTSWITCH SELECTED BEFORE
START The user attempted to start the machine with the footswitch engaged.
2/4 Flash code 2/4 indicates that steering digital inputs are faulty.
NOT REQUIRED
Table 6-8. Help Fault Codes, Displayed Faults, and Descriptions - S/N 0300066931 to Present
Fault Flash
Code
Communicated (Displayed on
Analyzer) Fault
Description Priority