Model 422 & Model 422CC Instruction Manual
D01187869
Revision A, December 2015
46
4.
Seat the resistor securely in the slot in the mounting frame. Use care to
avoid damage to the resistor. The top surface of resistor must be level with
the top of the mounting frame.
5.
Use a smooth, round rod (such as the round shank of a screwdriver) to rub
top surface of resistor, burnishing resistance wire lightly so potentiometer
slider will slide smoothly with minimal noise.
6.
Rotate potentiometer slider by hand. Assure that slider makes contact with
the resistor during its entire range of motion. If necessary, adjust slider by
bending it up or down.
7.
Replace shaft bearing retainer and check the potentiometer mechanism with
a calibrating device.
11.6 Potentiometer Mechanism Spring Replacement
1.
Remove shaft bearing retainer and potentiometer slider.
2.
Remove old spring.
The spring should wind tighter when the slider is moved in the
counter- clockwise direction.
3.
Install new spring.
4.
Replace potentiometer slider.
5.
Loosen the three spring adjuster clamp screws on underside of the frame,
but do not remove the screws.
6.
Rotate the spring adjuster until the potentiometer slider lines up with the
front contact strip. Tighten adjuster clamp screws.
7.
Rotate potentiometer slider by hand. Assure that slider makes contact with
the resistor during its entire range of motion. If necessary, adjust slider by
bending it up or down.
8.
Replace shaft bearing retainer and check the potentiometer mechanism with
a calibrating device.