JLG 450A_AJ Series II Service Manual - Manual (Page 341)

SECTION 6 - JLG CONTROL SYSTEM
3121290 – JLG Lift – 6-31
TESTING VALVES Indicates valve test is beginning. Each valve is alternately energized
and de-energized; checks are made for open- and short- circuit valve
coils.
NOTE: In platform mode, the footswitch must be closed.
NOTE: Tower lift valves are not tested if TOWER LIFT=NO. Tower tele-
scope valves are not tested if TOWER TELE=NO. Jib valves are not tested
if JIB = NO. Extendable axle valves are not tested if EXT AXLES=NO. Four
wheel steer valves are not tested if 4WS=NO.
NOTE: Left/right jib valves are not tested unless JIB = SIDESWING.
Problems that can be reported include below messages.
CANT TEST VALVES There is a wiring problem, which prevents the valve test from function-
ing correctly. Check valve wiring. Check ground alarm & hour meter
wiring.
XXXXXXX S/C Named valve is drawing too much current so is presumed to be short-
circuited. Check valve wiring.
XXXXXXX O/C Named valve is drawing too little current so is presumed to be open-cir-
cuit. Check valve wiring.
CHECKING INPUTS Indicates inputs test is beginning. Every input is checked to ensure that
it is in its “normal” position; function switches should be open, cutout
switches should be closed, joysticks should be in neutral.
In platform mode any non-neutral platform switch or joystick is
reported; any active cutouts are reported.
In ground mode any non-neutral ground switches is reported; any
active cutouts are reported.
NOTE: Switches not in use (due to the settings of machine digits), are
not checked.
NOTE: Pump pot is checked only for a wire-off condition; it can be at any
demand from creep to maximum.
Problems that can be reported include below messages.
CHECK XXXXXXX The named switch is not in its “normal” position. Check switch & wiring.
CHECK XXXXXXX JOY The named joystick appears to be faulty. Check joystick.
TESTING LAMPS Indicates lamps test is beginning. Each lamp is energized in turn; a
prompt asks for confirmation the lamp is lit.
ENTER must be pressed or clicked to continue the test.
NOTE: Lamps, which are not in use (due to the settings of machine dig-
its), are not checked.
NOTE: Platform Lamps are only tested in platform mode.
NOTE: The GM overload lamp and 500# capacity lamp are not tested.
NOTE: Head and tail lamps are tested in both platform and ground
mode if enabled by a machine digit.
TESTING ALARMS Indicates alarms test is beginning. Each alarm is energized in turn; a
prompt asks for confirmation the alarm is sounding.
ENTER must be pressed or clicked to continue test.
NOTE: Platform alarm and horn are only tested in platform mode.
NOTE: Ground alarm is not tested if GROUND ALARM = NO.
Table 6-4. System Test Messages
Message Displayed on
Analyzer
Message Displayed on
Analyzer
Description