SERVICE (cont.)

CONTROL BOARD (FMD-2,-2FD,DBC-2FD,DBC-3)

FMD DBC-3 shown

FIG. 10 CONTROL BOARD

P4102.40

 

Location:

The Control Board is located behind the lower front access cover mounted on the component bracket.

Test Procedure:

Power Supply:

1.Disconnect the dispenser from the power source.

2.With a voltmeter, back probe check the voltage across pins 1 & 2 of the eight pin J1 connector on the wiring 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 diagram and check the dispenser wiring harness back to the transformer.

4.With a voltmeter, back probe check the voltage across pins 2 & 4 of the six pin J2 connector on the wiring harness. Connect the dispenser to the power source. The indication must be:

a)120 volts ac for two wire 120 volt models

b)120 volts ac for three wire 120/208 volt models or three wire 120/240 volt models

c)240 volts ac for two wire 240 volt models.

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

5.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 6. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness back to the power cord.

Liquid Level Control Circuitry

6.Carefully connect a piece of insulated jumper wire to pin 3 (third from left on top row) of J1 on the control board. Keep the other end of this wire away from any metal surfaces of the dispenser.

7.With a voltmeter check the voltage across the terminals of the inlet solenoid valve. Connect the dispenser to the power source. After a 10 second delay, the indication must be :

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

b)120 volts ac for three wire 120/208 or 120/240 volt models.

c)240 volts ac for two wire 240 volt models.

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

8.Touch the free end of the jumper wire to the dis- penser housing. The indication must be 0.

If voltage is present as described, proceed to step 9. If the voltage is not present as described, replace the control circuit board.

NOTE: Verify the ground wire is connected to the board mounting stud before replacing the control board.

9.Gently pull the liquid level probe out of the tank lid and inspect for corrosion. Replace it if necessary.

10.Place the probe so that neither end is in contact with any metal surface of the dispenser.

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Bunn FMD-5, FMD-4 manual Control Board, Test Procedure Power Supply

FMD-4, FMD-5 specifications

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