Bunn JDF-4SB, JDF-4D manual Membrane Switch

Page 37

SERVICE (CONT.)

Cold Water Dispense Membrane Switch (all Models)

COLD

FIG.47 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 Cold Water

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 three 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

WATER

COLD

COLD WATER DISPENSE

FIG. 48 MEMBRANE SWITCH

37	49179	110613

Image 37

Contents Phone 217 529-6601 FAX 217 JDF-4D, JDF-4SBBUNN-O-MATIC Commercial Product Warranty Introduction Recommended Daily Cleaning Instructions Required Regular Maintenance Cold Water Circulation Problem Probable CauseRemedy Refrigeration Problem Probable Cause RemedyDispenser Locked Out Continuity When dispensing. If yes, replaceEd replace relay Check for kinked flex lineWater only Concentrate onlyTray Nect fittingsWater pressure greater than 100psiAdapter assembly Pump tubing Inspect, clean, or replace tubing AgeUnit is not working Replace control boardComponent Access ServiceAccess Panels Servicecont Access PanelsDispense Platform Removal Servicecont Dispense Platform RemovalTest Procedure ServiceBallast JDF-2S,4S LocationCabinet Fan all Models Remove the four screws attaching the fan and cover assemblyLocation LG Compressor JDF-2S,4S,4DDesign Pressures High 335 Low 88 psi CompressorCompressor GD Compressor JDF-2S,4S,4DDisconnect and remove the transformer Compressor Thermal Compressor JDF-4SBBLU/BLK Compressor Switch Compressor Switch all ModelsCondenser FAN Condenser Fan all ModelsControl Board, Main all Models Test Procedure Power Supply CircuitryWith a voltmeter, back probe check the voltage Portion Control Board JDF-2S,4SSource. The indication must be 24 volts ac To the transformer See TransformerPush Button Control Board Push Button Control Board JDF-4DPortion Control Board JDF-4D With a voltmeter Circulation Pump all ModelsDisconnect the two black wires from the switch Dispense Platform Switch all ModelsReturn power to the dispenser Dispense Pump Dispense Pump all Models except JDF-4DDispense Motor all Models Reconnect the two wires to the motor as shown in FigDispense Valve Dispense Valve all Models Dispense Switches Dispense Switches JDF-2S, JDF-4SCold Water Dispense Switch Cold Water Dispense Switch JDF-4S onlyLocation Dispense Membrane Switch all ModelsMembrane Switch EMI Filter EMI Filter all ModelsLamps & Holders Lamps, Holders and Ballasts Early ModelsLED Lamps JDF-2S, JDF-4S Disconnect power from the dispenserLED regulator board Rectifier Rectifier JDF-2S, JDF-4SRelay all Models Refer to to reconnect the wiresVolts ac for 120 volt models Volts ac for 230 volt models Resistor Resistor all 230V ModelsIf voltage is present as described, proceed to #5 Solenoid Cold Water JDF-4S only120V 1.2 kΩ 230V 3.84 kΩ Solenoid Inlet all ModelsTemp Resistance Voltage Temperature Probe all Models32 F 31.2k 34k Ω 77 F 8k 10.2k Ω32 F 5k Ω Temperature Sensor all Models77 F 350 Ω Transformer Terminals Transformer all ModelsTransformer Lited Doors JDF-2S, JDF-4S Water Q27 Compressor Relay Q25Water 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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