Bunn POWDER AUTO FILL service manual Transformer

Page 26

SERVICE (cont.)

TRANSFORMER

P1930

FIG. 23 TRANSFORMER

Location:

The transformer is located under the hopper sup- port panel mounted to the left of the whipper motor.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.Disconnect the four pin connector from the main wiring harness from the four pin connector on the transformer.

3.Check the voltage across the black wire (pin 1) and the white wire (pin 2) on the plug from the main wiring harness. Connect the dispenser to the power source. The indication must be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 volt CE models.

4.Disconnect the dispenser from the power source.

If voltage is present as described, reconnect the plug and the connector and proceed to #5.

If voltage is not present as described, refer to the wiring diagrams and check the main wiring harness.

5.Check the voltage between J1-2 and J1-3 on the twelve pin connector at the control board. Connect the dispenser to the power source. The indication must be 24 volts ac.

If voltage is present as described, the transformer is operating properly.

If voltage is not present as described, replace the transformer.

Removal and Replacement:

1.Remove the hopper from the dispenser.

2.Remove the four #8-32 screws securing the hopper support panel to the dispenser.

3.Disconnect the red/black and green wires from the hopper switch and set the hopper support panel aside.

4.Disconnect the transformer four pin connector from the four pin plug on the main wiring harness.

5.Remove the two #6-32 keps nuts securing the transformer to the dispenser base. Remove and discard the transformer.

6.Install the new transformer on the dispenser base and secure with two #6-32 keps nuts.

7.Connect the four pin connector on the transformer to the four pin plug on the main wiring harness.

8.Reconnect the red/black and green wires to the hopper switch. See Fig. 10 on page 17.

9.Install the hopper support panel and secure with four #8-32 screws.

10.Install the hopper assembly.

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29793 011500

 

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Contents Bunn Powder Auto Fill Introduction WarrantyInitial SET-UP User Notices Operating Instructions Adjustments Rinse and dry each item thoroughly before reas- sembling CleaningRecommended Daily Cleaning and Maintenance Tips Dispense Fault ListNormal operation Powder Auto-Fill ready to Door not closedTroubleshooting Problem Probable CauseCDS product tastes watery or sugary ProblemRemedy Problem Probable Cause Remedy Install a regulator if necessary to Procedures. SeeImproper adjustment of product Product overflows CDS hopper Control Board and ProbeService Component AccessRetainer Clip Auger Drive ComponentsHopper Lid Spacer Dust Seal Hopper BaseDiagrams and check wiring harness Auger Drive MotorFrother and MIXING/WHIPPER Chamber Mixing ChamberWhipper Motor Volts ac for 120 volt models Volts ac for 230 volt CE modelsInstall dispense tip into the bottom of the whipper chamber Whipper MotorIf voltage is present as described, proceed to #5 If voltage is present as described, proceed to #9Test Procedure Low Product Detect Instal the new control board using the four #6-32 keps nuts Remove the control boardLocation TEST/SERVICE SwitchDisconnect the wires from the switch terminals Main Power ON/OFF Switch Main Power ON/OFF Switch Lamp Cord Assembly Refer to when reconnecting the wiresRemove new nut and washer from new lamp cord connector Lamp Cord ConnectorDisconnect the lamp cord from the lamp cord connector Lamp HOLDER/SOCKET Assembly Close the dispenser doorTransformer TransformerPotentiometer PotentiometerHopper Level Indicator Hopper Level IndicatorHopper Switch Hopper SwitchDoor Switch Door SwitchAdjustments Pressure Regulator and Needle ValveDispense Solenoid Valve Dispense Solenoid Valve LocationWiring Diagrams Schematic Wiring Diagram PAF BLK REDWiring Diagrams Schematic Wiring Diagram Pafa
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