Bunn CDS-3 manual Potentiometer, SERVICE cont

SERVICE (cont.)

POTENTIOMETER

P1931

FIG. 24 POTENTIOMETER

Location:

The potentiometer is located under the hopper sup- port panel mounted to the left of the whipper motor and mounted on a bracket. Adjustments can be made by removing the 0.50” plug located on the whipper motor mounting panel.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.Remove the six #8-32 screws securing the rear cover to the dispenser housing.

3.Disconnect the three pin connector (J3) from the control board.

4.Check the resistance between pins 1 & 3 of the potentiometer connector using an ohmmeter. The indication must be between 800 and 1200 ohms.

If the resistance measures as described, proceed to #5.

If resistance does not measure as described, replace the potentiometer assembly.

5.Adjust the potentiometer fully clockwise.

6.Check resistance between pins 2 & 3 of the potenti- ometer connector with an ohmmeter. The indication must be between 800 and 1200 ohms. Check the resistance between pins 1 & 2 of the potentiometer connector with an ohmmeter. The indication must be less than 20 ohms.

If the resistance measures as described, proceed to #7.

If resistance does not measure as described, replace the potentiometer assembly.

7.Adjust the potentiometer fully counterclockwise.

8.Check resistance between pins 1 & 2 of the potenti- ometer connector with an ohmmeter. The indication must be between 800 and 1200 ohms. Check the resistance between pins 2 & 3 of the potentiometer connector with an ohmmeter. The indication must be less than 20 ohms.

If the resistance measures as described, the potenti- ometer is operating properly.

If resistance does not measure as described, replace the potentiometer assembly.

Removal and Replacement:

1.Disconnect the dispenser from the power source.

2.Remove the six #8-32 screws securing the rear panel to the dispenser.

3.Disconnect the three pin connector (J3) from the control board.

4.Open the dispenser door and remove the #8-32 screw securing the potentiometer mounting bracket to the whipper motor mounting panel.

5.Remove the potentiometer and mounting bracket as an assembly.

6.Remove the facenut and locking washer securing the potentiometer to the bracket.

7.Install the new potentiometer to the mounting bracket using the locking washer and facenut.

8.Install the potentiometer and bracket assembly to the whipper motor panel and secure with #8-32 screw.

9.Connect the three pin connector (J3) to the control board.

10.Install the rear panel to the housing and secure with six #8-32 screws.

27 29793 061599