Bunn FMD-5 User Manual

35

FIG. 27 HOPPER DRIVE BOARD

Location
The hopper drive board is located inside the dispenser 

mounted on the auger motor mounting bracket.

Test Procedures:

1.  Disconnect the dispenser from the power source.

2.  Disconnect the white/red wire and the white wire 

from the hopper speed control board.

3.  Check the voltage across the white/red wire and 

the white wire with a voltmeter. With the rinse/

run switch in the run (lower) position, connect the 

dispenser to the power supply. The indication must 

be:

 

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

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

120/240 volt models.

 

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

4.  Disconnect the dispenser from the power supply.

P1665

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the wiring 

diagram and check the dispenser wiring harness.

5.  Check the voltage across the positive (red wire) 

terminal and the negative (black wire) terminal on 

the auger motor with a voltmeter. With the rinse/

run switch in the run (lower) position press and 

hold the dispense switch. Connect the dispenser 

to the power supply. After a .6 second delay the 

indication must be 4.0 to 24.5 volts dc.

If voltage is present as described,the auger motor drive 

is operating properly. If auger does not turn  replace 

the auger motor.

If voltage is not present as described, replace the hop-

per drive board.

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