Bunn CDS-3 User Manual

49

FIG. 51 TRANSFORMER TERMINALS

P1329

FIG. 50 TRANSFORMER

P1342

Location:

The transformer is located inside the chassis on the 

upper rear side of the component bracket.

Test Procedures:

1.  Disconnect the dispenser from the power source.

2.  Disconnect the plug from the transformer to the 

connector  from  the  dispenser  main  wiring  har-

ness.

3.  With  a  voltmeter,  check  the  voltage  across  the 

white/red wire and the white/black wire in the dis-

penser  main  wiring  harness  connector.  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 models.

4.   Disconnect the dispenser from the power source.

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

If  voltage  is  not  present  as  described,  refer  to  the 

Wiring Diagram and check the dispenser main wiring 

harness.

5.  Reconnect the plug from the transformer to the con-

nector from the dispenser main wiring harness.

6.  Connect the dispenser to the power source.

7.  Disconnect the lamp cord from the lamp cord con-

nector.

8.   With a voltmeter, check the voltage across the in-

side of lamp cord socket and the outside with the 

DAY/NIGHT switch in the “-” down position. The 

indication must be approximately 12.6 volts dc.

9.  Disconnect the dispenser from the power source.

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 four #8-32 locking screws securing 

the component bracket to the chassis.

2.  Pull component bracket from the chassis far enough 

to gain access to the transformer.

3.  Disconnect the connector from the dispenser main 

wiring harness from the plug on the transformer.

4.  Remove the four #8-32 locking screws securing 

the transformer to the component bracket.

5.  Remove transformer and discard,

6.  Position new transformer on the component bracket 

and secure with four #8-32 locking screws.

7.  Reconnect the plug on the transformer to the con-

nector on the dispenser wiring harness.

8.  Refer to Fig. 51 and reconnect the wires.

9.   Position  component  bracket  in  the  chassis  and 

secure with four #8-32 locking screws.

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