Bunn AFPO-3 SL - Manual (Page 13)

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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. 10.
5. With the probe box switch in the “LOW” position
check the resistance across the pins, refer to Fig.
10.
6. If readings match the values indicated, the probe
system 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. 11 when reconnecting the wires.
FIG. 8 PROBE SWITCHES
SERVICE (cont.)
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.
FIG. 11 PROBE LOW/OFF/HIGH SWITCH
TERMINALS
P1540
PROBE SYSTEM
P1523
4. Check resistance across pins as shown in Fig. 9.
5. With the probe box switch in “LOW” position check
the resistance across the signal cable pins, see Fig.
9.
6. If readings match values indicated, the probe
system is functioning properly. If not, check the
probe boxes.
FIG. 9 SIGNAL CABLE PINS
P1538
BLU (HIGH) from Probe
Box Cable
GRN (OFF) from Probe
Box Cable
TAN (LOW) from Probe Box
Cable
P1539 FIG. 10 PROBE BOX CABLE PINS
AFPO-2 AFPO-3
AFPO-2 & 3
41093 040408