Bunn FMD-1 FMD-2 service manual HOPPER DRIVE BOARD - FMD-1 ONLY, SERVICE cont

SERVICE (cont.)

HOPPER DRIVE BOARD - FMD-1 ONLY

P1665

FIG. 21 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.

4.Disconnect the dispenser from the power supply.

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

If voltage is not present as described, refer to the wir- ing 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 hopper drive board.

Removal and Replacement: (Refer to Fig. 2)

1.Remove hopper assy (17), and set aside for reas- sembly.

2.Remove the four #8-32 screws securing the hop- per support plate (12), remove plate and set aside for reassembly.

3.Remove the four #8-32 screws, located inside the dispener housing on the lower right front of the auger motor mounting panel (21), securing auger motor mounting bracket (18) and auger motor

(19)to the rear of the auger motor mounting panel

(21).

4.Disconnect the wires from the terminals on the hopper drive board and disconnect the three pin plug (J1) from the hopper drive board..

5.Remove auger motor mounting bracket (18), au- ger motor (19), dust seal (20) and hopper drive board as an assembly.

6.Remove the two #8-32 screws securing the hop- per drive board to the auger motor mounting bracket.

7.Remove the two spacers from the hopper drive board and discard board.

8.Install spacers on new hopper drive board.

9.Install new hopper drive board to the auger motor mounting bracket using two #8-32 screws..

10.Refer to Fig. 22 and reconnect the wires to the hopper drive board terminals .

11.Connect three pin plug from the potentiometer to the hopper drive board J1. Refer to Fig. 22.

12.Install auger motor mounting bracket with auger motor and hopper drive board to the rear of the auger motor mounting panel using four #8-32 screws.

13.Install hopper support plate using four #8-32 screws.

14.Install hopper assy (17).

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