Bunn ULTRA-1 manual Transformer, SERVICE cont

SERVICE (cont.)

TRANSFORMER

FIG. 65 TRANSFORMER - ULTRA-1

Location:

The transformer is located inside dispenser onthe lower right side of the chassis.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.Remove right side panel.

3.Connect the dispenser to the power source.

4.Connect a voltmeter from the WHI/BLU wire to the WHI/BLK wire on the transformer.

The indication must be: a) Aprox. 12.6 volts ac.

-LINE	-
R
FIG. 66 TRANSFORMER - ULTRA-2

Removal and Replacement:

1.Disconnect the dispenser from the power source.

2.Remove right side panel.

3.Disconnect the four wires from transformer.

4.Disconnect the wiring harness from the plug on the transformer.

5.Remove the two #8-32 nuts securing the trans- former to the chassis base. Remove transformer and discard.

6.Position new transformer on the chassis base, and secure with two #8-32 nuts.

7.Refer to Fig. 67 and reconnect the wires.

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

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

5.Connect a voltmeter from the WHI wire to the BLK wire on the transformer.

The indication must be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 volt models.

If voltage is present as described, replace trans- former.

WHI/BLU to

Main Harness

“LOAD”

WHI to Main Harness

Ultra-1 WHI/GRY to Main Harness Ultra-2 WHI/BLK to Main Harness

BLK to Main Harness

- -LINE

“LINE”

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

FIG. 67 TRANSFORMER TERMINALS

54 41084 102709