Section 4 • Repair Procedures
REV A
September 2016
Part No. 227123 GRC 4 - 3
1-1
Circuit Board
How to Remove the Platform
Controls Circuit Board
1 Push in the red Emergency Stop button to the
off position at both the ground and platform
controls.
2 Disconnect the platform controls from the
control cable at the platform.
3 Remove the fasteners securing the platform
control box to the platform control bracket.
4 Remove the fasteners securing the bottom
cover to the platform control box. Open the
control box.
5 Remove the ties securing the wire harness.
6 Disconnect the red and black wires from the
alarm.
7 Carefully remove the alarm from the platform
control box.
8 Carefully disconnect all wire harness
connectors from the platform controls circuit
board.
Electrocution/burn hazard. Contact
with electrically charged circuits
could result in death or serious
injury. Remove all rings, watches
and other jewelry.
Component damage hazard.
Electrostatic discharge (ESD) can
damage printed circuit board
components. Maintain firm contact
with a metal part of the machine
that is grounded at all times when
handling printed circuit boards OR
use a grounded wrist strap.
PLATFORM CONTROLS
9 Carefully remove the platform controls circuit
board fasteners.
10 Carefully remove the platform controls circuit
board from the platform control box.
11 Remove the transparent caps from the platform
controls circuit board and save.
Circuit board fastener torque specifications
Hand tighten until screw seats < 5 in-lbs
< 0.6 Nm
Note: Before installing a circuit board, place the
transparent caps removed in step 11, over the
circuit board buttons.
Note: After installing the circuit board, check for
proper button operation. Excessive torque of the
circuit board fasteners will cause the buttons to
bind. Moderate torque of the circuit board
fasteners will not allow the buttons to engage.
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