Bunn FMD-4, FMD-5 manual Auxillary Control Board FMD DBC-3 only

SERVICE (cont.)

AUXILLARY CONTROL BOARD (FMD DBC-3 only)

P4102.40

FIG. 6 AUXILIARY CONTROL BOARD

Location:

The auxiliary control board is located behind the lower front access cover, mounted on the rear side of the component bracket.

Hot Water Dispense

Test Procedure:

1.Disconnect the dispenser from the power source.

2.With a voltmeter, and using the component mount- ing bracket as a reference (-), back probe check for voltage at pin 1 (red wire) of J1. Connect the dispenser to the power source. The indication must be approximately 37 volts dc.

3.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 5. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness.

4.Back probe check the voltage across pins 2 (black wire) and 5 (white wire) of the six pin J2 connector on the wiring harness with a voltmeter. 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 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.

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.

6.Check the voltage across the terminals of the hot water dispense solenoid with a voltmeter. Connect the dispenser to the power source. Press the hot water dispense switch. 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.

7.Disconnect the dispenser from the power source.

If voltage is present as described the hot water dispense circuitry is operating properly. If voltage is not present as described, replace the auxiliary control board.

Ready Light Circuit

Test Procedure:

1.Disconnect the dispenser from the power source.

2.With a voltmeter, and using the component mount- ing bracket as a reference (-), back probe check for voltage at pin 1 (red wire) of J1. Connect the dispenser to the power source. The indication must be approximately 37 volts dc.

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.

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