JLG 530LRT, Service And Maintenance Manual

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SECTION 6 - LSS SETUP/CALIBRATION/SERVICE
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6.9 TROUBLESHOOTING
The following tables are furnished to provide possible resolutions for common difficulties. Difficulties are classified as
General, Calibration, Measurement Performance, and Host System Functionality.
Also refer to Electrical Schematic in Section 7 for wiring circuit diagnostics.
Table 6-5. LSS Troubleshooting Chart - General
DIFFICULTY POSSIBLE RESOLUTION
JLG Analyzer does not display “HELP:
PRESS ENTER” when connected to LSS
Module’s connection, but the module’s
LED is lit or flashing. The JLG Analyzer is failing to communicate with the LSS Module, but the LSS Module is powered (indicated by module’s
LED). Investigate JLG Analyzer serial communication and power supply connections.
1. If the Analyzer displays “CONNECTING…” or “CONNECTION ERROR” after a short interval, examine the Analyzer
harness on J2. J2-2 should connect to Pin 3 on the Analyzer, and J2-11 should connect to Pin 2.
2. If the Analyzer does not display anything (and there is no backlighting), examine the Analyzer’s power supply.
Remove the harness connection from J2 and ensure that J2-1 has approximately 12V, and J2-12 is 0V. The harness
should connect J2-1 to Pin 1 on the Analyzer, and J2-12 to Pin 4 on the Analyzer.
3. The JLG Analyzer is suspect. Substitute to determine cause of failure.
4. The LSS Module is suspect. Substitute to determine cause of failure.
LED on LSS Module does not light. The LSS Module is un-powered, a short exists, or the device is damaged.
1. LSS Module’s power supply is improper. Check for the presence of approximately 12V on J1-1, and 0V on J1-2. The
module’s power supply comes from the Platform Console Box. Use to the Wiring Diagram to trace the conductors to
their source.
2. There is a short circuit on the reference voltage present on J5-J8. Unplug the connectors one at a time and observe
if the module begins to function after a particular connection is removed. If so, carefully inspect the wiring
between the module and that sensor.
3. There is a short circuit on the pre-regulated supply for the JLG Analyzer present on J2-1. Unplug J2’s connector and
observe whether the module begins to function. If so, examine the Analyzer harness for defect.
4. The LSS Module is suspect. Substitute to determine cause of failure.
Table 6-6. LSS Troubleshooting Chart - Calibration
Difficulty Possible Resolution
JLG Analyzer displays
“<MIN CAL” after attempt is made to Cali-
brate. The LSS Module expected the empty platform to weight more for calibration.
1. The platform is being supported by something other than the four Shear Pin Load Cells. This includes binding
between the slide block/spacer bushing/arm tube assembly (bushing should be free enough to rotate by hand).
For proper operation, the platform’s entire weight must be transferred through the Shear Pin Load Cells and into
the arm support structure for an accurate calibration.
2. The wrong Model Selection was made under the LSS Module’s MACHINE SETUP, MODEL. This should be set to the
proper MODEL. Improper selection may lead the LSS Module to expect different empty platform weights.
3. The calibration difficulty may be a result of a Measurement Performance issue. Review the Possible Resolutions
under that category.
JLG Analyzer displays “>MAX CAL” after
attempt is made to Calibrate. The LSS Module expects the empty platform to weigh less for calibration.
1. Tools, debris, or customer-installed accessories have not been removed before calibration. The LSS Module must
tare an empty platform and its optional JLG Accessories.
2. The wrong Model Selection was made under the LSS Module’s MACHINE SETUP, MODEL. This should be set to
MODEL. Improper selection may lead the LSS Module to expect different empty platform weights.
3. The calibration difficulty may be a result of a Measurement Performance issue. Review the Possible Resolutions
under that category.