Bunn LPG-2, G9WD, G9-2T DBC, G1, FPG-2 Potentiometer Model FPG, SERVICE Cont, Potentiometers

SERVICE (Cont.)

Potentiometer (Model FPG)

SMALL	MEDIUM	LARGE
		P2946
FIG 34 POTENTIOMETERS

Location:

The potentiometer switches are located on the top rear of the hopper housing.

Test Procedure:

1.Disconnect the grinder from the power source.

2.Open hopper lid and loosen four screws inside the hopper and remove hopper.

3.Disconnect the BRN wire from the control board.

4.Disconnect the PNK, GRY, and TAN wires from the front selector switch.

5.Connect an ohmmeter to the BRN wire. Connect the other lead from the meter to the TAN wire. Turn the knob for the SMALL potentiometer all the way counterclockwise. The meter should read <3K ohm. Turn the knob all the way clockwise, the meter should read between 94K and 116K ohms.

6.Connect an ohmmeter to the GRY wire. Connect the other lead from the meter to the TAN wire. Turn the knob for the MEDIUM potentiometer all the way counterclockwise. The meter should read <3K ohm. Turn the knob all the way clockwise, the meter should read between 94K and 116K ohms.

7.Connect an ohmmeter to the TAN wire. Connect the other lead from the meter to the TAN wire. Turn the knob for the LARGE potentiometer all the way counterclockwise. The meter should read between 13.5K and 19.5K ohms. Turn the knob all the way clockwise, the meter should read between 108K and 132K ohms.

If continuity is present at all positions, the potentiometer switches are operating properly.

If continuity is not present at any position, replace the potentiometer switches.

8. Refer to Fig 35 when reconnecting wires.

Removal and Replacement:

1.Disconnect the grinder from the power source.

2.Remove the four 8-32 screws attaching the rear access panel and move aside.

3.Disconnect three wires to the batch selector switch and the one wire to the timer.

4.Loosen the setscrews on the switch knobs and remove the knobs.

5.Remove the three nuts and lockwashers attaching the switches to the rear access panel.

6.Inspect and replace the adhesive backed sponge washers on the rear access panel if necessary.

7.Install the new potentiometer switches and tighten the lockwashers and nuts.

8.Replace the knobs and tighten the setscrews. 9.Refer to Fig. 35 when reconnecting wires.

BRN to BRN WIRE at TIMER

PNK to BATCH SELECTOR SWITCH

GRY to BATCH SELECTOR SWITCH

TAN to BATCH SELECTOR SWITCH

FIG 35 POTENTIOMETER TERMINALS

37 41545 122209