Bunn U3 Manuales De Servicio

Page 35

BLK from 

Terminal Block

SET

     L

OC

K

LO

CK

SE

T

FIG. 34 TRANSFORMER

P175

Location:

 

The transformer is located on the top rear of the 

timer mounting bracket.

Test Procedures:

1.  Disconnect the brewer from the power source.

.  Disconnect black wire and the red wire from the 

terminal block at the transformer.

3.  With  a  voltmeter,  check  the  voltage  across  the 

black wire and the red wire. Connect the brewer 

to the power source. The indication must be 380 

volts ac.

4.  Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to wiring 

diagram and check the brewer wiring harness.

5.  Reconnect the black wire and the red to the trans-

former.

6.  Disconnect the black wire and the white wire from 

the transformer terminals.

7.  With  a  voltmeter,  check  the  voltage  across  the 

transformer terminals. Connect the brewer to the 

power source. The indication must be 10 volts 

ac.

If voltage is present as described, the transformer is 

operating properly

If  voiltage  is  not  present  as  described,  replace  the 

transformer.

Removal and Replacement:

1.   Disconnect all the wires from the transformer.

.  Remove the two #8-3 screws securing the trans-

form to the transformer mounting bracket.

3.  Remove the transformer and discard.

4.  Position new transformer on transformer mounting 

bracket and secure with two #8-3 screws.

5.   Refer to Fig. 35 and reconnect the wires.

RED from 

Terminal Block

WHI from Main 

Harness

BLK from 

Main Harness

FIG. 35 TRANSFORMER TERMINALS

P1753

10060  031599