SERVICE (CONT.)

Control Board, Main (all Models)

JDF-4S shown

P3250.25

FIG. 23 CONTROL BOARD

Location:

The Main Control Board is located on the electrical component enclosure behind the splash panel.

Test Procedure:

Power Supply Circuitry:

1.Disconnect the dispenser from the power source.

2.With a voltmeter, back probe check the voltage across pins 1 & 3 of the J6 connector on the wir- ing harness. Connect the dispenser to the power source. The indication must be 24 volts ac.

3.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4. If voltage is not present as described, refer to the Wiring Diagrams and check the dispenser wiring harness back to the transformer (See TRANSFORMER).

4.Disconnect the dispenser from the power source.

5.With a voltmeter, back probe check the voltage across pins 1 & 3 of the J12 connector on the wiring harness. Connect the dispenser to the power source. The indication must be 24 volts ac.

6.Disconnect the dispenser from the power source.

If voltage is not present as described, refer to the Wiring Diagrams and check the dispenser wiring harness back to the transformer (See TRANSFORMER).

Removal and Replacement:

1.Remove the four #6-32 screws securing the control board to the component bracket.

2.Disconnect all the plugs on the main wiring harness from the connectors on the control board.

3.Remove the spacers from the control board and discard.

4.Install the spacers on to the new control board

5.Reconnect all plugs on the main harness to the connectors on the control board.

6.Install new control board on the component bracket using four #6-32 screws.

NOTE: Verify all ground wires are connected to the grounding stud and secured with nuts.

JDF-4S

JDF-2S

FIG. 24 CONTROL BOARD CONNECTORS

25

49179

110613

 

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Bunn JDF-4SB, JDF-4D manual Control Board, Main all Models, Test Procedure Power Supply Circuitry

JDF-4D, JDF-4SB, JDF-4S specifications

The Bunn JDF-4S is a high-performance commercial coffee brewer designed to meet the needs of busy coffee shops, restaurants, and other establishments requiring a reliable and efficient coffee brewing solution. This versatile machine boasts an array of advanced features and technologies, making it a prominent choice among professionals in the coffee industry.

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The JDF-4S incorporates Bunn’s patented brewing technology, which utilizes a precision-controlled process to ensure optimal flavor extraction. The brewed coffee is delivered at an ideal temperature, typically between 195°F and 205°F, promoting maximum taste and aroma. The machine also features a programmable digital controller that enables users to set specific brew times and adjust water temperature settings to achieve consistent results.

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In terms of maintenance, the Bunn JDF-4S is designed with user convenience in mind. The machine includes a rinse and clean cycle to ensure optimal hygiene and coffee quality. Integrated clean alerts guide users through the cleaning process, promoting regular upkeep and ensuring the longevity of the brewer.

In summary, the Bunn JDF-4S represents a cutting-edge solution for coffee brewing that prioritizes performance, versatility, and ease of use. With its advanced brewing technology, user-friendly features, and robust construction, it offers an exceptional choice for businesses seeking to serve high-quality coffee efficiently.