Bunn JDF-4SB, JDF-4D manual SERVICE CONT Control Board, Main all Models

SERVICE (CONT.)

Control Board, Main (all Models)

JDF-4S shown

P3250.25

FIG. 23 CONTROL BOARD

Location:

The Main Control Board is located on the electrical component enclosure behind the splash panel.

Test Procedure:

Power Supply Circuitry:

1.Disconnect the dispenser from the power source.

2.With a voltmeter, back probe check the voltage across pins 1 & 3 of the J6 connector on the wir- ing harness. Connect the dispenser to the power source. The indication must be 24 volts ac.

3.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4. If voltage is not present as described, refer to the Wiring Diagrams and check the dispenser wiring harness back to the transformer (See TRANSFORMER).

4.Disconnect the dispenser from the power source.

5.With a voltmeter, back probe check the voltage across pins 1 & 3 of the J12 connector on the wiring harness. Connect the dispenser to the power source. The indication must be 24 volts ac.

6.Disconnect the dispenser from the power source.

If voltage is not present as described, refer to the Wiring Diagrams and check the dispenser wiring harness back to the transformer (See TRANSFORMER).

Removal and Replacement:

1.Remove the four #6-32 screws securing the control board to the component bracket.

2.Disconnect all the plugs on the main wiring harness from the connectors on the control board.

3.Remove the spacers from the control board and discard.

4.Install the spacers on to the new control board

5.Reconnect all plugs on the main harness to the connectors on the control board.

6.Install new control board on the component bracket using four #6-32 screws.

NOTE: Verify all ground wires are connected to the grounding stud and secured with nuts.

JDF-4S

JDF-2S

FIG. 24 CONTROL BOARD CONNECTORS

25 49179 110613