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Replacing the Potentiometer

Electrostatic discharge (ESD) potential could cause
damage to electronic pressure control. Use SprayTECH
ESD wrist strap P/N 0507958 or equivalent when working
on electronic pressure control.

1. Perform the Pressure Relief Procedure.
2. Pry off the pressure control knob cap to expose the knob

tension nut.

3. Turn the pressure control knob fully counterclockwise to

the minimum pressure setting.

4. Using a 5/16” socket, loosen the tension nut in the center

of the knob. Remove the knob.

5. Using a Phillips screwdriver, remove the four screws that

secure the electronic pressure control (EPC) assembly to
the EPC housing. Carefully remove the EPC assembly
from the housing. Gently move the assembly away from
the sprayer and allow the assembly to hang from the
housing.

6. Hold the potentiometer inside the EPC housing while

using a 1/2” thin wall socket to remove the seal nut that
secures the potentiometer to the mounting plate. Remove
the potentiometer from the EPC housing.

7. Carefully remove the potentiometer wires from their

connection point on the EPC board.

8. Insert the stem of the new potentiometer through the hole

in the mounting plate from inside the EPC housing.
Position the protruding tab on the potentiometer face into
the hole on the underside of the mounting plate (the wires
will face the open side of the EPC housing).

9. Thread the seal nut onto the threaded portion of the stem

and tighten using a 1/2” thin wall socket.

Do not over-tighten the seal nut.

10. Turn the potentiometer stem fully counterclockwise.

11. Place the pressure control knob on the potentiometer

stem with the indicator tab resting at the “minimum
pressure” tab on the mounting plate.

12. Tighten the knob tension nut using a 5/16” socket.

Do not over-tighten the knob tension nut. Over-tightening
will damage the potentiometer.

13. Connect the potentiometer wires to the EPC board. The

protruding tab on the EPC board connector will mate with
the slot on the potentiometer wires connector. The
connector on the end of the potentiometer wires and the
connector on the EPC board will mate only one way. Do
not force the connectors together.

14. Carefully place the EPC assembly over the EPC housing

taking care not to pinch any wires.

15. Install the four screws that secure the EPC assembly to

the EPC housing. Tighten securely.

CAUTION

EPC

Housing

Pressure Control Knob
Seal Nut

Cap

EPC

Board

EPC

Assembly

EPC

Assembly

Screw

Potentiometer

WARNING

Replacing the Pump ON/OFF Switch

Electrostatic discharge (ESD) potential could cause
damage to electronic pressure control. Use SprayTECH
ESD wrist strap P/N 0507958 or equivalent when working
on electronic pressure control.

1. Perform the Pressure Relief Procedure.
2. Using a Phillips screwdriver, remove the four screws that

3. Locate the bottom of the pump ON/OFF switch inside the

EPC housing.

4. Disconnect the switch wires from the pump ON/OFF

switch. Remember the locations of each of the two wires
(label the wires, if necessary).

5. Depress the mounting tabs on each corner of the pump

ON/OFF switch inside the EPC housing and remove the
switch through the top of the housing.

6. Snap the new pump ON/OFF switch into the switch hole

in the EPC housing.

7. Connect the two switch wires to the new pump ON/OFF

switch. Make sure the wires are connected to the
corresponding terminals from which they were removed
(refer to the labels created earlier in this procedure or the
electrical schematic in the Parts List section of this
manual).

8. Carefully place the EPC assembly over the EPC housing

taking care not to pinch any wires.

9. Install the four screws that secure the EPC assembly to

the EPC housing. Tighten securely.

EPC

Housing

Pump ON/OFF

Switch

EPC

Board

EPC

Assembly