Service Manual Instruction Manual

SECTION 6 - JLG CONTROL SYSTEM
3121616 – JLG Lift – 6-19
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 triggered above
4.35 volts. If the centertap is at the low end of the range, these faults will be trig-
gered 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 – 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
directions 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 / SWIN G WITH NO QPROX This fa ult only occ urs wit h i ndu cti ve joys tic ks . It occu rs i f the joy st ick is mov ed
out of the neutral position with no Qprox sensors active.
l/S JOY. QPROX BAD These faults only occur with inductive joysticks. They indicate 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 voltage is less
than centertap voltage minus half the center tap voltage minus 0.3 volts. If cen-
tertap is at high end of the range, these faults will be triggered below 1.05 volts.
If centertap is at 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 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 voltage is more
than centertap voltage plus half the centertap voltage plus 0.3 volts. If center-
tap is at hig h end of t he ra nge, thes e fa ul ts w ill be tri gge re d abo ve 4.3 5 volts. I f
centertap is at low end of the range, these faults will be triggered above 3.8
volts.
Table 6-3. Help Fault Codes, Displayed Faults, and Descriptions
Fault Flash
Code
Communicated (Displayed on
Analyzer) Fault
Description Priority