Bunn AF PR-3 service manual Probe System, Refer to when reconnecting the wires

SERVICE (cont.)

PROBE SYSTEM

	P1523
FIG. 8 PROBE SWITCHES

Location

The probe switches are located on the rear of each hopper, mounted in the probe housing cover.

Test Procedure

Probe System

1.Disconnect the dispenser from the power source.

2.With the probe boxes connected to the signal cable, remove connector from refill box.

3.Place the switch on the probe box in the “HIGH” position.

4.Check resistance across pins as shown in Fig 8A.

5.With the probe box switch in “LOW” position check the ohms across the signal cable pins, see Fig. 8A.

6.If readings match values indicated the probe system electrically is functioning properly. If not check the probe boxes.

Probe Boxes:

1.Disconnect the signal cable from the probe boxes.

2.Remove probe box from CDS hopper.

3.Place the switch on the probe box in the “HIGH” position.

4.Check the resistance across the box cable pins, see Fig. 8B.

AFPR-2 & 3

FIG. 8B PROBE BOX CABLE PINS P1539

5.With the probe box switch in the “LOW” position check the ohms across the pins, refer to Fig. 8B.

6.If readings match the values indicated the probe system electrically is functioning properly.

Switch Removal and Replacement:

1.Remove the #6 thread cutting screw securing the probe housing cover to the probe housing.

2.Remove the wires from the switch terminals.

3.Compress the clips inside the probe box and gently push the switch through the opening

4.Push the new switch into the opening and spread the clips to hold switch in the autofill box.

5.Refer to Fig 9 when reconnecting the wires.

BLU (HIGH) fromProbe

Box Cable

GRN (OFF) from Probe

Box Cable

TAN (LOW) from Probe Box

Cable

FIG. 9 PROBE LOW/OFF/HIGH SWITCH TER-P1540

MINALS

AFPR-2AFPR-3

FIG. 8A SIGNAL CABLE PINS

P1538

11 28791.1 011500