Bunn JDF-4SB, JDF-4D manual Dispense Membrane Switch all Models, Location

Page 36

SERVICE (CONT.)

Dispense Membrane Switch (all Models)

WATER

COLD

FIG.45 MEMBRANE SWITCHES

Location:

The dispense buttons are located on the lower outside of the dispenser door and actuate switches on the dispense switch board located on the inside of the door.

Test Procedures:

NOTE: Before continuing, check that the ribbon cable is properly connected to the control board and not a pin off in either direction.

1.Disconnect the dispenser from the power source.

2.Remove the rear panel and disconnect ribbon cable.

3.Check for continuity of the switches using pin #1as common.

#1 Common #2 ON/STOP #3 Large #4 Medium #5 Small

If continuity is not present when the appropriate switch is pressed, the Membrane Switch must be replaced. If continuity is present, chech the short harness going to J6 on the Control Board.

Removal and Replacement:

1.Disconnect the dispenser from the power source.

2.Open the dispenser door.

3.Remove the four #8-32 screws securing the lower door panel and remove the panel.

4.Disconnect the six pin harness from the switch board.

5.Carefully peel the membrane switch from the front of the switch bezel.

6.Remove any excess adhesive from the bezel sur- face.

7.Remove the backing from the new membrane switch.

8.Feed the membrane switch harness through the openning and apply the new membrane switch to the switch bezel.

9.Connect the switch harness to the control board.

1

PORTION CONTROL

FIG. 46 MEMBRANE SWITCH

36	49179	110613

Image 36

Contents JDF-4D, JDF-4SB Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Introduction Recommended Daily Cleaning Instructions Required Regular Maintenance Problem Probable Cause Cold Water CirculationRemedy Problem Probable Cause Remedy RefrigerationDispenser Locked Out When dispensing. If yes, replace ContinuityEd replace relay Check for kinked flex lineConcentrate only Water onlyNect fittings TrayWater pressure greater than 100psiPump tubing Inspect, clean, or replace tubing Age Adapter assemblyUnit is not working Replace control boardService Component AccessServicecont Access Panels Access PanelsServicecont Dispense Platform Removal Dispense Platform RemovalService Test ProcedureBallast JDF-2S,4S LocationRemove the four screws attaching the fan and cover assembly Cabinet Fan all ModelsLG Compressor JDF-2S,4S,4D LocationCompressor Design Pressures High 335 Low 88 psiGD Compressor JDF-2S,4S,4D CompressorDisconnect and remove the transformer Compressor JDF-4SB Compressor ThermalBLU/BLK Compressor Switch all Models Compressor SwitchCondenser Fan all Models Condenser FANTest Procedure Power Supply Circuitry Control Board, Main all ModelsPortion Control Board JDF-2S,4S With a voltmeter, back probe check the voltageSource. The indication must be 24 volts ac To the transformer See TransformerPush Button Control Board JDF-4D Push Button Control BoardPortion Control Board JDF-4D Circulation Pump all Models With a voltmeterDispense Platform Switch all Models Disconnect the two black wires from the switchReturn power to the dispenser Dispense Pump all Models except JDF-4D Dispense PumpReconnect the two wires to the motor as shown in Fig Dispense Motor all Models Dispense Valve all Models Dispense ValveDispense Switches JDF-2S, JDF-4S Dispense SwitchesCold Water Dispense Switch JDF-4S only Cold Water Dispense SwitchDispense Membrane Switch all Models LocationMembrane Switch EMI Filter all Models EMI FilterLamps, Holders and Ballasts Early Models Lamps & HoldersDisconnect power from the dispenser LED Lamps JDF-2S, JDF-4SLED regulator board Rectifier JDF-2S, JDF-4S RectifierRefer to to reconnect the wires Relay all ModelsVolts ac for 120 volt models Volts ac for 230 volt models Resistor all 230V Models ResistorSolenoid Cold Water JDF-4S only If voltage is present as described, proceed to #5Solenoid Inlet all Models 120V 1.2 kΩ 230V 3.84 kΩTemperature Probe all Models Temp Resistance Voltage32 F 31.2k 34k Ω 77 F 8k 10.2k ΩTemperature Sensor all Models 32 F 5k Ω77 F 350 Ω Transformer all Models Transformer TerminalsTransformer Lited Doors JDF-2S, JDF-4S Compressor Relay Q25 Water Q27Water Q28 Water Q7Diagram for JDF-2S LED Lited Doors Schematic Wiring Schematic Wiring Diagram JDF-4S Schematic Wiring Diagram JDF Schematic Wiring Diagram JDF-4D Schematic Wiring Diagram JDF-4D Electrical Schematic Diagram

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