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JDF-2S, JDF-4S
JDF-4D, JDF-4SB
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts Catalog, Programming Manual, or Service Manual, please visit the Bunn-O-Matic website, at www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and
manual updates. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
49179.0000C 02/14 ©2013 Bunn-O-Matic Corporation
Contents
Phone 217 529-6601 FAX 217
JDF-4D, JDF-4SB
BUNN-O-MATIC Commercial Product Warranty
Introduction
Recommended Daily Cleaning Instructions
Required Regular Maintenance
Cold Water Circulation
Problem Probable Cause
Remedy
Refrigeration
Problem Probable Cause Remedy
Dispenser Locked Out
Continuity
When dispensing. If yes, replace
Ed replace relay
Check for kinked flex line
Water only
Concentrate only
Tray
Nect fittings
Water pressure greater than
100psi
Adapter assembly
Pump tubing Inspect, clean, or replace tubing Age
Unit is not working
Replace control board
Component Access
Service
Access Panels
Servicecont Access Panels
Dispense Platform Removal
Servicecont Dispense Platform Removal
Test Procedure
Service
Ballast JDF-2S,4S
Location
Cabinet Fan all Models
Remove the four screws attaching the fan and cover assembly
Location
LG Compressor JDF-2S,4S,4D
Design Pressures High 335 Low 88 psi
Compressor
Compressor
GD Compressor JDF-2S,4S,4D
Disconnect and remove the transformer
Compressor Thermal
Compressor JDF-4SB
BLU/BLK
Compressor Switch
Compressor Switch all Models
Condenser FAN
Condenser Fan all Models
Control Board, Main all Models
Test Procedure Power Supply Circuitry
With a voltmeter, back probe check the voltage
Portion Control Board JDF-2S,4S
Source. The indication must be 24 volts ac
To the transformer See Transformer
Push Button Control Board
Push Button Control Board JDF-4D
Portion Control Board JDF-4D
With a voltmeter
Circulation Pump all Models
Disconnect the two black wires from the switch
Dispense Platform Switch all Models
Return power to the dispenser
Dispense Pump
Dispense Pump all Models except JDF-4D
Dispense Motor all Models
Reconnect the two wires to the motor as shown in Fig
Dispense Valve
Dispense Valve all Models
Dispense Switches
Dispense Switches JDF-2S, JDF-4S
Cold Water Dispense Switch
Cold Water Dispense Switch JDF-4S only
Location
Dispense Membrane Switch all Models
Membrane Switch
EMI Filter
EMI Filter all Models
Lamps & Holders
Lamps, Holders and Ballasts Early Models
LED Lamps JDF-2S, JDF-4S
Disconnect power from the dispenser
LED regulator board
Rectifier
Rectifier JDF-2S, JDF-4S
Relay all Models
Refer to to reconnect the wires
Volts ac for 120 volt models Volts ac for 230 volt models
Resistor
Resistor all 230V Models
If voltage is present as described, proceed to #5
Solenoid Cold Water JDF-4S only
120V 1.2 kΩ 230V 3.84 kΩ
Solenoid Inlet all Models
Temp Resistance Voltage
Temperature Probe all Models
32 F 31.2k 34k Ω
77 F 8k 10.2k Ω
32 F 5k Ω
Temperature Sensor all Models
77 F 350 Ω
Transformer Terminals
Transformer all Models
Transformer Lited Doors JDF-2S, JDF-4S
Water Q27
Compressor Relay Q25
Water Q28
Water Q7
Diagram 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
