Page 149 Speed Level Series - Service & Parts Manual
January 2019Section 9 - Troubleshooting - 3084ES Models
Troubleshooting Chart
The following chart is a guide to help the technician find the area of a problem. In order to benefit
from the information, you are advised to fully assess the symptoms by operating all machine
functions. There may be some functions that operate while others may not. Record this information
and proceed down the left-hand column until you find the failure scenario that best fits the problem.
Refer to the information provided to the right for possible causes and remedies. This unit contains a
Microprocessor based control system which contains various safety features designed to protect itself
and the operator in the event of a failure.
It is strongly recommended that the technician use the EZ-Cal to read any displayed messages
before proceeding to use this Troubleshooting chart. The EZ-Cal scan tool will provide the technician
with detailed information related to the failure.
Information on the use of the EZ-Cal tool plus helpful Flow Charts and graphs can be found earlier in
this troubleshooting section. Please read and familiarize yourself with all of the information provided
in the troubleshooting section before attempting to diagnose or repair the machine.
Problem Possible Cause Remedy/Solution
General Power Issue
No operation from
upper or lower
control station; no
red LED at GP400.
Main battery switch turned off Located left of lower control box.
Emergency switch pushed in or
ignition switch turned off or defective
Upper or lower e-stop switch will cut all power, as will
the ignition switch in the platform control box.
Batteries discharged
Will receive 4-4 or 7-7 flash on GP400. Clean,
service and charge batteries.
Battery charger may not operate if battery voltage
drops below 20 volts.
Blown 30 amp fuse Located just below the battery cutoff switch
Circuit breaker tripped Located in lower control box panel
No functions; LED
illuminated or
flashing on GP400
Blown 300 amp fuse
Located just to the left of lower control station.
Check for excessive motor amperage draw.
Will receive a 7-7 flash code on GP400.
Batteries discharged
Will receive 4-4 or 7-7 flash on GP400. Clean,
service and charge batteries.
Battery charger may not operate if battery voltage
drops below 20 volts
Damaged upper control box harness
Inspect from harness plug to terminal strip under
platform.
May receive 6-6 flash code on GP-400 (CAN bus)
Other fault in system monitored by
GP400
Check Help message on EZ-Cal or check flash code
for error
Functions from
lower controls but
not from upper
controls
Interlock switch (joystick)
Check power to red wire (power to switch) and power
to purple wire (power out of switch) at joystick plug
Loose plug connections on Matrix
module
Check plug connections
Damaged upper control box harness
Inspect from harness plug to terminal strip under
platform.
May receive 6-6 flash code on GP-400 (CAN bus)
System interlock Check HELP messages using EZ-Cal
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