JLG 660SJ Service Manual - Manual (Page 267)

SECTION 6 - JLG CONTROL SYSTEM
3121202 – JLG Lift – 6-21
D/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 centertap 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 trig-
gered above 4.35 volts. If the centertap is at the low end of the range, these
faults will be triggered above 3.8 volts.
D/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.
WAITING FOR FSW TO BE
OPEN Footswitch was closed when platform mode was selected. Can be
reported during power-up sequence.
2/3 Flash code 2/3 indicates problems with boom function selection. 3
LIFT/SWING LOCKED – JOY-
STICK MOVED BEFORE
FOOTSWITCH Platform upper lift or swing was selected before and during footswitch clo-
sure.
PUMP SWITCHES FAULTY –
CHECK DIAGNOSTICS/
BOOM A boom function (lower lift, telescope, basket level, basket rotate, jib) has
both directions selected together.
PUMP SWITCHES LOCKED –
SELECTED BEFORE FOOT-
SWITCH 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 centertap 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 trig-
gered above 4.35 volts. If the centertap is at the low end of the range, these
faults will be triggered above 3.8 volts.
Table 6-2. Help Fault Codes, Displayed Faults, and Descriptions
Fault Flash
Code
Communicated (Displayed on
Analyzer) Fault
Description Priority