Troubleshooting Chart - Mec Speed Level 2684 RT Service And Parts Manual

T
ROUBLESHOOTING
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 possi-
ble 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 mes-
sages before proceeding to use this Troubleshooting chart. The EZ-cal scan tool will pro-
vide 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.
Table 4b-4: Troubleshooting Chart
Problem
General Power Issue
No operation from Main battery switch turned off
upper or lower control
station; no red LED at
GP400.
Emergency switch pushed in or ignition
switch turned off or defective
Batteries discharged
Blown 30 amp fuse
Circuit breaker tripped
No functions; LED Blown 300 amp fuse
illuminated or flashing
on GP400
Batteries discharged
Damaged upper control box harness
Other fault in system monitored
by GP400
Functions from lower Interlock switch (joystick)
controls but not from
upper controls
Loose plug connections on Matrix module Check plug connections
Damaged upper control box harness
System interlock
"3084 Speed Level™ Sigma Lift" Service and Parts Manual
T
R O U B L E S H O O T I N G
C
HART
Possible Cause
- 3 0 8 4 E S - - T
M O D E L R O U B L E S H O O T I N G
Remedy/Solution
Located left of lower control box.
Upper or lower e-stop switch will cut all power, as will the
ignition switch in the platform control box.
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.
Located just below the battery cutoff switch
Located in lower control box panel
Located just to the left of lower control station.
Check for excessive motor amperage draw.
Will receive a 7-7 flash code on GP400.
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
Inspect from harness plug to terminal strip under platform.
May receive 6-6 flash code on GP-400 (CAN bus)
Check Help message on EZ-Cal or check flash code for error
Check power to red wire (power to switch) and power to
purple wire (power out of switch) at joystick plug
Inspect from harness plug to terminal strip under platform.
May receive 6-6 flash code on GP-400 (CAN bus)
Check HELP messages using EZ-Cal
C
H A R T
November 2009
Page 4b-29