JLG 600SC_660SJC Service Manual - Manual (Page 67)

SECTION 4 - BOOM & PLATFORM
3120898 – JLG Lift – 4-27
Troubleshooting
TOOLS REQUIRED (INSTALL/REPLACE)
Screwdriver (Flat blade), Voltmeter, Wire Stripper, OEM
OPTIMIZER, and cable - 4 conductor
GENERAL DESCRIPTION
The SUPERFLEX Control System has been designed to
perform in the harsh environments that are present in the
mobile equipment industry. Experience shows that the
most common problems encountered are external to the
system. Broken wires, loose connections, defective con-
nections, wiring errors, wiring shorts, and the improper
supply voltage are the major source of field problems.
Three (3) diagnostic LED’s are provided on the SUPER-
FLEX Controller. To help isolate an internal or external
problem, use Figure 4-31., Testing the SUPERFLEX to
determine the fault condition.
How To Troubleshoot the SUPERFLEX
Controller
Refer to Figure 4-31., Testing the SUPERFLEX, and follow
the "TO TEST" instructions. These are located on the gold
cover of the SUPERFLEX.
How to Troubleshoot the Digisensor
To check for proper DIGISENSOR operation, the following
simple test with a 9 VDC battery or 12 VDC power source
will work:
1. Connect +9V(or 12VDC) to the red wire and the
negative terminal to the black wire.
2. Observe the LEDs located in opposite corners. A
correctly functioning DIGISENSOR, when properly
applied, will always have one or both LEDs turned
on. If in the following tests, both LEDs turn off while
power is present, the DIGISENSOR must be
replaced.
NOTE: If no LED activity is observed, check the battery
voltage to assure the battery is O.K.
3. DIGISENSOR test steps while powered, refer to the
drawing above.
a. Warn the shaft fully clockwise (C.W.). LED #1
must be turned on and LED #2 must be turned
off.
b. Turn the shaft fully counter-clockwise (C.C.W.).
LED #1 Must be turned off and LED #2 must be
turned on.
c. To find the center of shaft rotation, turn the shaft
slowly to find a point at which both LED #1 and
LED #2 turn on simultaneously. This position
occurs in a narrow transition location between
steps A and B.
Figure 4-31. Testing the SUPERFLEX