Bunn FMD-5, FMD-4 Service Auxillary Control Board, Disconnect the dispenser from the power source

Page 18

SERVICE (cont.)

AUXILLARY CONTROL BOARD (cont.)

4.On the dispenser whipper panel, ensure that the tank heater switch is in the “ON” (lower) position.

5.Disconnect the black wire coming from the control thermostat from the limit thermostat.

6.Remove the control thermostat bulb from the tank.

7.With a voltmeter, and using pin 5 as a reference, back probe check for voltage, in turn, at pin 3 and pin 6 of the six pin J2 connector of the wiring har- ness. 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.

8.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 9. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness.

9.Re-install the control thermostat bulb.

10.Noting the starting position of the control thermostat knob, adjust the control thermostat knob counter- clockwise until a click is heard.

11.With a voltmeter, check for voltage between pins 3 and 6 of the six pin J2 connector of the wiring har- ness. Connect the dispenser to the power source. The indication must be:

a)120 volts ac for two wire 120 volt models

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

12.Disconnect the dispenser from the power source. Return the control thermostat knob to the starting position.

If voltage is present as described, replace the auxiliary control board. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness.

Removal and Replacement:

1.Loosen the two #8-32 screws securing the compo- nent mounting bracket to the dispenser housing.

2.Slide the component mounting bracket forward until the screw heads align with the large diameters of the keyhole openings.

3.Lift the component mounting bracket, and pull it through the lower access panel opening.

4.Disconnect the two plugs on the main wiring har- ness from the connectors on the auxiliary control board.

5.Remove the two #6-32 keps nuts securing the auxiliary control board to the component mounting bracket.

6.Remove the auxiliary control board.

7.Remove the two snap-in stand-offs from the auxiliary control board and install them in the new auxiliary control board. Discard the old auxiliary control board.

8.Install the new auxiliary control board using the two #6-32 keps nuts.

9.Reconnect the two plugs on the main wiring harness to the connectors on the auxiliary control board.

10.Replace the component mounting bracket and tighten the two #8-32 screws.

J2

 

J1

 

FIG. 7 AUXILIARY CONTROL

P1996.80

BOARD TERMINALS

 

18

42672 122209

 

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Contents FMD Series Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Excluding regular maintenance itemsIntroduction Cleaning Required Regular Maintenance Problem Probable Cause Level Control Board and Probe FMD-1 ProblemProduct will not dispense RemedyProblem Probable Cause Remedy Troubleshooting Excess dust Fan Refer to Service Product overflows container Dispense SwitchInstall a regulator if necessary to Procedures. See42672 Component Access 20,23SERVICEcont Access PanelsService Auger Drive Components all Models Test Procedures Auger MotorLocation Spacer Auger Motor Hopper Base Dust Seal Washer Service Auger Drive Components Retainer Clip Panel RED to Control BoardBushing Panel Auger Drive Shaft Remove auger drive shaft bushing from hopperRinse and dry each item thoroughly Locknut Auger Motor BracketAuxillary Control Board FMD DBC-3 only Service Auxillary Control Board Disconnect the dispenser from the power sourceService Ballast all ModelsTest Procedure Power Supply Control BoardCheck that the RINSE/RUN switch is in the Rinse position Hopper Motor Control CircuitryControl Board Using four #6-32 keps nutsConnectors on the control board Control board to the component bracketControl Board Check that the rinse/run switch is in the run posi- tion Control Board Connectors Remove temperature probe from the tank LocationRemove bulb from the tank Control Thermostat BLK to MainWHI to Main Open the dispenser door and remove the bottom door cover If voltage is present as described, proceed to #6If voltage is present as described, proceed to #7 Digital Touch Control Switch FMD DBC-2,DBC-3 FMD DBC-3FMD DBC-2FD Digital Touch Control Switch ConnectorsEMI Filter 230 Volt FMD DBC-3 EMI FilterTest Procedures Disconnect the black and white wires from the fan terminalsVacuum FAN all Models Frother and Whipper Motor all Models except -2FD Frother and Whipper MotorFrother and Whipper Motor Will seat inside the whipper chamberHopper Drive Board FMD-1 only Hopper Drive BoardHopper Drive Board Terminals HOT/COLD Switch Optional for FMD DBC-3 Disconnect the wires from the switch terminalsTerminals Lamp Holder all Models Door Assy Upper Panel Lamp Holders Lower PanelLamp Starter and Socket Reconnect the violet wire to terminal Level Control Board and Level Probe FMD-1 onlyLevel Board Terminals Limit Thermostat all Models Limit ThermostatOverflow Protection Switch Rinse /RUN Switch all Models RINSE/RUN SwitchSolenoid Valve Cold Water Optional for FMD-2,-3,-4,-5 Cold Water Solenoid TerminalsSolenoid Valves Dispense all Models Dispense Solenoid Valves P1637.40 LocationHOT Water Dispense Solenoid Valve FMD-2FD,DBC-2FD,-3,DBC-3 Solenoid ValveSolenoid Valve Inlet all Models Inlet Solenoid ValveWHI or RED to Main BLK to Limit Wiring Harness Tank Heater all ModelsTank Heater Relay FMD-4,-5,120V Dispensers only BRN/BLK from WHI from Main HarnessTank Heater Switch all Models Tank Heater SwitchDisconnected from the main wiring harness Transformer all ModelsRemove and discard the transformer Q5 & MOV4 Controls Right Whipper Motor Q1 & MOV1 Controls Left Whipper MotorQ2 & MOV3 Controls Center Whipper Motor Q7 & MOV2 Controls Refill ValveSchematic Wiring Diagram FMD-1 BLKSchematic Wiring Diagram FMD-1A WHI-16Schematic Wiring Diagram FMD-2 Schematic Wiring Diagram FMD-2A Schematic Wiring Diagram FMD DBC-2 Freeze Dried W/HOT Water Schematic Wiring Diagram FMD-2FD 42672 42672 42672 42672 Schematic Wiring Diagram FMD DBC-3 With HOT Water Dispense Schematic Wiring Diagram Fmda DBC-3 With HOT Water Dispense 42672 42672 42672 42672 Schematic Wiring Diagram FMD-5A
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