Bunn AFPO-2, Service And Repair Manual

10

J4

J1

J2

J3

SERVICE

CIRCUIT BOARD

FIG. 2 CIRCUIT BOARD

P1520

Location:

The circuit board is located inside the autofill box, 

mounted on the right side of the solenoid mounting 

bracket under the switch panel.

Test Procedure:

1.  Disconnect the dispenser from the power source.

2.  Disconnect  the  ten  pin  plug  on  the  main  wiring 

harness from the connector on the circuit board.

3.  Connect the dispenser to the power source. With 

a  voltmeter,  check  the  voltage  across  the  black 

wire(#3) and the white wire (#6).  The indication 

must be:

a) 120 volts ac for two wire 120 volt models.

b) 200 to 240 volts ac for two wire 200 or 240 volt 

models.

FIG. 3 CIRCUIT BOARD CONNECTOR LOCATION

P1528

c) 230 volts ac for two wire 230 volt models.

4.  Disconnect the dispenser from the power source.

If voltage is present as described, replace the circuit 

board. 

If voltage is not present as described, refer to the 

Wiring Diagrams

 and check main wiring harness.

Removal  and Replacement:

1.  Remove  the  four  #8-32  keps  nuts  securing  the 

switch mounting bracket. Set aside with the wires 

attached.

2.  Remove the circuit board shield and set aside for 

reassembly.

3.  Disconnect the ten pin plug from the main wiring 

harness to the circuit board.

4.  Remove the six #4-40 screws and spacers securing 

the circuit board to the solenoid mounting bracket. 

Remove circuit board and discard.

5.  Install new circuit board using #4-40 screws and 

spacers to secure the circuit board to the solenoid 

mounting bracket. The spacers must be between the 

solenoid mounting bracket and the circuit board.

6.  Place circuit board shield over the circuit board.

7.  Install switch panel assembly and secure with four 

#8-32 keps nuts.

8.  Refer to Fig. 3 for circuit board ten pin connector.

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