JLG 20VP (3120728) Service Manual - Manual (Page 34)

SECTION 2 - SERVICE PROCEDURES
2-16 – JLG Lift – 3120728
Platform Control Box Disassembly
DO NOT ATTEMPT TO DISASSEMBLE THE PLATFORM CONTROL
BOX IF MACHINE IS STILL UNDER WARRANTY. OPENING THE
PLATFORM CONTROL BOX WHILE THE MACHINE IS UNDER
WARRANTY WILL VOID THE WARRANTY. IF UNDER WARRANTY
REQUEST A REPLACEMENT BOX FROM THE FACTORY.
The VP Series platform control box allows for replacement
of five (5) components internal to the box.
• Controller Integrated Circuit Board
• Joystick Assembly
• Emergency Stop Switch
• Speed Control Switch
• Touch Pad Switch Assembly
Except for the touch pad switch assembly, which plugs
into the circuit board, replacement of each component
requires unsoldering, then soldering each replacement
components’ wiring to the controller’s integrated circuit
board. Due to the small contact area when connecting
each wire to the circuit board this soldering requires pre-
cise temperatures and neatness of the soldered point
itself so as not to destroy the circuit board or cross any of
the circuit paths on the board.
ELECTROSTATIC DISCHARGE CAN DAMAGE COMPONENTS ON
THE INTEGRATED CIRCUIT BOARD. PLACE THE PLATFORM
CONTROL BOX ON A NON-CONDUCTIVE SURFACE WHEN OPEN-
ING THE BOX AND WORKING DIRECTLY WITH THE CIRCUIT
BOARD.
Removing Control Box From Platform
1. Turn off all power to the platfom control box.
2. Unhook the wiring harness cable at the quick-dis-
connect coupling. (Early VP models were not
equipped with the quick-disconnect coupling, skip to
Step 4.)
3. Remove the platform control box and box mount to
a suitable work surface.
4. Remove the control box from the control box mount
by removing the four (4) nuts from the studs on the
bottom of the control box.
5. Unplug the wiring harness cable connector on the
back of the lower housing half.
6. Lay control box mount and wiring harness assembly
aside.
Lower Half Of Housing Removal
1. Position the control box upside down and remove
the six (6) screws attaching the lower half of the
housing to the upper half of the control box housing.
2. Lay screws and lower housing aside.
Joystick Assembly Removal
NOTE: To completely remove the joystick assembly, its wir-
ing will need to be unsoldered from the intregrated
circuit board.
1. Remove the four (4) screws from the top of the bezel
around the base of the joystick and slide the joystick
assembly out of the upper housing.
2. Unplug the touchpad switch ribbon connector from
the circuit board connector socket.