Controller Circuit Board Handling; Circuit Board Handling; Circuit Board Removal; Circuit Board Replacement - Kohler Decision-Maker 1 Manual

8.1 Controller Circuit Board
Handling
Electronic printed circuit boards (PCBs) are sensitive to
a variety of elements and can be damaged during

removal,

installation,
Observe the following when working with circuit boards.
8.1.1

Circuit Board Handling

D
Store circuit boards in the antistatic, cushioned
packaging provided by the factory in a clean
environment away from moisture, vibration, static
electricity, corrosive chemicals, solvents, or fumes
until installation.
D
Wear an approved grounding, antistatic wrist strap
when handling circuit boards or components.
D
Carefully hold the circuit board only by its edges, not
by any of its components.
D
Don't bend or drop the circuit board or any of its
components.
D
Don't strike the circuit board or any of its components
with a hard object.
D
Clean dusty or dirty circuit boards only with a vacuum
cleaner, dry brush, and/or aerosol spray cans
specifically for electronic
components. Aerosol spray cans are typically found
with computer supplies.
D
Never attempt component-level circuit repairs as this
may void third party certification.
D
Never remove or install a circuit board with the power
connected.
D
Label wiring when disconnecting it for reconnection
later.
8.1.2

Circuit Board Removal

1. Remove all external connections from the circuit
board.
D
Loosen screws on terminal strips and remove
the individual leads. Label as needed.
D
Remove push-on terminals by firmly pulling on
the terminal.
necessary.
D
Remove wiring harnesses with plug connectors
by pressing the locking tab(s) and pulling on the
plug straight out to remove the wiring harness
plug from the circuit board socket.
124 Section 8 Component Testing and Adjustment
transportation, or storage.
equipment
Use a long-nose pliers as
2. Remove the mounting screws typically located at
the corners of the circuit board.
3. Locate the PCB push-on standoffs found at various
locations on the circuit board.
typically made of white nylon but may be other
colors or made of metal.
Carefully pry the circuit board away from each
standoff. Start at a location near the circuit board
edge and work in succession either clockwise
(CW), counterclockwise (CCW), or across the
circuit board. DO NOT USE EXCESSIVE FORCE
as circuit boards will break when sufficiently bent.
8.1.3

Circuit Board Replacement

1. Position the circuit board over the push-on
standoffs on the controller mounting plate.
2. Gently push the circuit board onto the standoffs.
Start at a location near the circuit board edge and
work in succession either CW, CCW, or across the
circuit board. DO NOT USE EXCESSIVE FORCE
as circuit boards will break when sufficiently bent.
3. Replace the external connections on the circuit
board.

8.2 Other Service Parts

and
The removal and installation of service parts other than
circuit boards is covered by the following generic
procedure. Service parts include plug-in relays,
switches, lamps, meters, gauges, brackets, and other
hardware.
8.2.1 Removal
1. Disconnect wiring from the part(s), noting the
locations from which wiring was removed for later
reconnection. Tape and label the wires as needed.
2. Note the position of the part(s) and loosen or
remove hardware that holds the part(s) in place. If
the removal is complex or will span several days,
make sketches or use a video recorder or digital
camera to help capture the detail.
Note the location, type, and condition of the
hardware removed and compare it with the parts
list. Replace damaged or missing hardware.
3. Carefully remove the part(s) from the unit. Gently
rock plug-in parts, such as relays, from side to side
while pulling straight out to remove them without
bending the circuit boards.
Standoffs are
TP-6356 4/12