Bunn FMD-4, FMD-5 manual Digital Touch Control Switch FMD DBC-2,DBC-3, FMD DBC-3, FMD DBC-2FD

Page 29

SERVICE (cont.)

DIGITAL TOUCH CONTROL SWITCH (FMD DBC-2,DBC-3)

FMD DBC-3 shown

P1631

FIG.18 DIGITAL TOUCH CONTROL SWITCH

Location:

The digital touch control switch is located on the lower outside of the dispenser door.

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Open dispenser door and remove the bottom door cover.

3.Disconnect the wires from the door interconnect wiring harness to the digital touch control switch assembly.

4.With a voltmeter, and using pin 1 of the multi-pin connector of the door interconnect wiring harness as a reference (-), check for voltage at each of the other pins of the connector. Connect the dispenser to the power source. The indication must be +5 volts dc.

5.On dispensers with a hot water valve, with a volt- meter, and using pin 1 of the multi-pin connector of the door wiring harness as a reference (-), check for voltage at pin 13 (blue/red wire). Connect the dispenser to the power source. The indication must be approximately 37 volts dc.

6.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 7. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring harness.

7.While pressing the appropriate switch, check for continuity across the following pins of the digital touch control switch assembly’s multi-pin connec- tor:

Note: Pin 1 of the connector is identified by an arrow embossed on the connector housing.

FMD DBC-3:

Left Small : pin 1 to pin 2

Left Medium: pin 2 to pin 3

Left Large: pin 1 to pin 3

Stop: pin 1 to pin 4

Center Small: pin 1 to pin 5

Center Medium: pin 5 to pin 6

Center Large: pin 1 to pin 6

Right Small: pin 1 to pin 7

Right Medium: pin 7 to pin 8

Right Large: pin 1 to pin 8

Hot Water: pin 1 to pin 13

FMD DBC-2FD:

Left Small : pin 1 to pin 2

Left Medium: pin 2 to pin 3

Left Large: pin 1 to pin 3

Stop: pin 1 to pin 4

Right Small: pin 1 to pin 5

Right Medium: pin 5 to pin 6

Right Large: pin 1 to pin 6

Hot Water: pin 1 to pin 7

If continuity is present as described, the membrane switch assembly is operating properly.

If continuity is not present as described, replace the membrane switch assembly.

29	42672 122209

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Contents Phone 217 529-6601 FAX 217 FMD SeriesExcluding regular maintenance items BUNN-O-MATIC Commercial Product WarrantyIntroduction Cleaning Required Regular Maintenance Problem Probable Cause Product will not dispense ProblemLevel Control Board and Probe FMD-1 RemedyProblem Probable Cause Remedy Troubleshooting Install a regulator if necessary to Product overflows container Dispense SwitchExcess dust Fan Refer to Service Procedures. See42672 20,23 Component AccessAccess Panels SERVICEcontLocation Service Auger Drive Components all ModelsTest Procedures Auger Motor Auger Drive Components ServiceSpacer Auger Motor Hopper Base Dust Seal Washer Retainer Clip Panel RED to Control BoardRinse and dry each item thoroughly Remove auger drive shaft bushing from hopperBushing Panel Auger Drive Shaft Locknut Auger Motor BracketAuxillary Control Board FMD DBC-3 only Disconnect the dispenser from the power source Service Auxillary Control BoardBallast all Models ServiceControl Board Test Procedure Power SupplyHopper Motor Control Circuitry Check that the RINSE/RUN switch is in the Rinse positionConnectors on the control board Using four #6-32 keps nutsControl Board Control board to the component bracketControl Board Check that the rinse/run switch is in the run posi- tion Control Board Connectors Remove bulb from the tank Remove temperature probe from the tank Location WHI to Main Control ThermostatBLK to Main If voltage is present as described, proceed to #7 Open the dispenser door and remove the bottom door coverIf voltage is present as described, proceed to #6 FMD DBC-2FD Digital Touch Control Switch FMD DBC-2,DBC-3FMD DBC-3 Connectors Digital Touch Control SwitchEMI Filter EMI Filter 230 Volt FMD DBC-3Vacuum FAN all Models Test ProceduresDisconnect the black and white wires from the fan terminals Frother and Whipper Motor Frother and Whipper Motor all Models except -2FDWill seat inside the whipper chamber Frother and Whipper MotorHopper Drive Board Hopper Drive Board FMD-1 onlyHopper Drive Board Terminals Disconnect the wires from the switch terminals HOT/COLD Switch Optional for FMD DBC-3Terminals Door Assy Upper Panel Lamp Holders Lower Panel Lamp Holder all ModelsLamp Starter and Socket Level Control Board and Level Probe FMD-1 only Reconnect the violet wire to terminalLevel Board Terminals Limit Thermostat Limit Thermostat all ModelsOverflow Protection Switch RINSE/RUN Switch Rinse /RUN Switch all ModelsCold Water Solenoid Terminals Solenoid Valve Cold Water Optional for FMD-2,-3,-4,-5Dispense Solenoid Valves P1637.40 Location Solenoid Valves Dispense all ModelsSolenoid Valve HOT Water Dispense Solenoid Valve FMD-2FD,DBC-2FD,-3,DBC-3Inlet Solenoid Valve Solenoid Valve Inlet all ModelsTank Heater all Models WHI or RED to Main BLK to Limit Wiring HarnessBRN/BLK from WHI from Main Harness Tank Heater Relay FMD-4,-5,120V Dispensers onlyTank Heater Switch Tank Heater Switch all ModelsRemove and discard the transformer Disconnected from the main wiring harnessTransformer all Models Q2 & MOV3 Controls Center Whipper Motor Q1 & MOV1 Controls Left Whipper MotorQ5 & MOV4 Controls Right Whipper Motor Q7 & MOV2 Controls Refill ValveBLK Schematic Wiring Diagram FMD-1WHI-16 Schematic Wiring Diagram FMD-1ASchematic 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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