Skyjack SJ 3220, Service Manual

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SJ3220, SJ3226, SJ4720, SJ4726, SJ4732 223198ABA
Section 5 – Procedures Skycoded Module
Flash Code Description
LED on steady There is no fault. All functions should be working normally.
LED off always There is no power to the Control Module CM1. Check wiring to P3-1 and P4-1
LED flash code
1/x
The Control Module CM1 has not been properly calibrated. Check height and load calibration.
LED flash code
2/x
Something is preventing functions operating normally. check EMS inputs and all operator switch inputs
(drive/lift mode, joystick, etc). Check for conditions which shut down functions (eg: tilted, too high to drive,
platform overloaded, etc).
NOTE: In base mode, only the base input switches are relevant. In platform mode the base input switches
are ignored.
LED flash code
3/x
There is a problem with the line contactor or valve wiring, or with the motor power wiring. Disconnect
connector P5 to see if the problem is caused by line contactor or valve wiring (if the fault clears, check for
an illegal B+ supply in to P5).
Check the motor power wiring. With the line contactor open, power terminals B+ and A should both be at
10V-15V (significantly lower than B+).
If the LED is steady at power-on, and the fault (3/5) occurs after a delay when attempting to drive or lift, the
motor may be stalled and causing an overload of the Control Module CM1.
LED flash code
4/x
There is a problem with battery supply, the height and/or pressure sensors, the supply to them, or the
temperature sensor inside the Control Module CM1.
Check battery supply to EMS inputs P3-1 or P4-1 (relative to the B- stud). The battery supply should be
between 15V and 32V.
Check the output from height and pressure sensors (P2/2, P2/4, P2-5). Check the 5V sensor supply (P2-1)
If the Control Module CM1 heatsink is very hot then the controller has temporarily shut down – if so,
platform lowering is still allowed. Wait for the controller to cool down.
LED flash code
6/x
There is a problem with load measurement – the height and/or pressure sensor measurements are out of
range or the elevation switch disagrees with the height sensor.
Check that the output from height and pressure sensors (P2/2, P2/4, P2-5) is in range (between 0.5V and
4.5V),
LED flash code
7/x There is a problem with the power wiring – the voltage on the B+ stud is too low (it should be at least 10V
at all times). Check for a short-circuit to the B+ stud.
LED flashing
fast and
continuously
This indicates that “factory override” is active – this special controller mode is intended for use during
machine manufacture only (see OVERRIDE procedure)
IMPORTANT: Never use a machine that is still in “factory override” – all safety and shutdown features are
disabled!
Help Messages
The display module shows help messages to show
the machine conditions. Some messages cause the
LED on the control module to flash so you can still
do simple troubleshooting even if the display is not
working.
IMPORTANT
Skyjack recommends reading the diagnostic
messages from the display module and not the
LED flash codes to troubleshoot the machine. The
diagnostic messages give more detailed data.
LED Flash Codes
The diagnostic messages from the LED are shown as
Dual Flash Codes. The LED flashes on/off a number
of times, stay off for a short time, then flash on/off
a number of times again then followed by a much
longer off time. The sequence repeats.
For example, on/off/on/off/on/off-short-delay/on/off/on/
off-long-delay/repeat