Operator Display Panel - JLG sky trak mmv Service Manual

4. Label and disconnect the wiring (3) from the back-up
alarm (1).
5. Remove the two nuts (4) and lockwashers (5)
securing the back-up alarm to the rear cover (2) at
the rear of the vehicle frame. Remove the two
capscrews (6), flat washers (7) and alarm (1) from
the vehicle.
b. Disassembly
DO NOT disassemble the back-up alarm. Replace a de-
fective or faulty alarm with a new one.
c. Inspection and Replacement
Inspect the wiring harness connector and alarm terminals
for continuity and shorting. Replace a defective or faulty
alarm with a new one.
d. Installation and Testing
Note: ALWAYS replace elastic locknuts with new elastic
locknuts to help ensure proper fastening.
1. Position the back-up alarm (1) over the holes in the
rear cover and secure with two capscrews (6), flat
washers (7), lockwashers (5) and nuts (4).
2. Connect the wiring harness connector lead (3) to the
back-up alarm.
3. Connect the negative (-) battery cable (11) at the
battery negative (-) terminal on the battery in the
engine side battery box.
4. Connect the negative (-) battery equalizer cable (12)
at the bottom of the battery equalizer (13). Torque
the nut to a maximum of 100 lbs/in (11 Nm).
5. Replace engine side battery box cover (8). Use the
wing nuts (9) and carriage bolts (10) to secure the
cover in place.
6. Test the alarm by turning the ignition switch to the
RUN position and shifting the travel select lever into
the reverse position. The back-up alarm should
sound.
Model MMV Rev. 12/04
10.12.4

Operator Display Panel

The information under this heading deals mainly with the
description and function of each indicator in the operator
display panel. Appropriate service procedures for each
circuit, as applicable, appear elsewhere in this section of
the manual.
The operator display panel is of solid-state, printed circuit
design and contains six wiring terminals or plugs, two
printed-circuit boards mounted piggy-back style with
standoffs, and a display panel that provides overall mon-
itoring of vehicle functions and status. Due to the complex
design and solid-state circuitry, the panel is non-service-
able. Electro-static discharge and moisture are two of the
main reasons for malfunction.
CAUTION:
welding on vehicle, disconnect the negative (-)
battery cable at the negative (-) battery termi-
nal. Failure to remove the negative (-) battery
cable will result in damage to vehicle electronic
systems.
Prevent the panel from coming into contact with static or
other electrical sources. When washing the vehicle, keep
spray away from the operator's display panel. Replace a
defective, malfunctioning or faulty panel with a new unit.
The operator's display panel provides important informa-
tion in a "user friendly" design with easily-recognizable
graphic and alpha-numeric indicators. The panel pro-
vides information the operator needs on vehicle and en-
gine functions.
When testing circuits connected to the dash, disconnect
the harness connector and test the harness side only.
Electrical System
Before performing ANY
10.111