Bunn TB3 User Guide

Page 25

FIG.19 UNSWEET/OFF/SWEET

SWITCH TERMINALS

P1763

37235  050205

FIG. 18 UNSWEET/OFF/SWEET SWITCH

P3034

Location:

The UNSWEET/OFF/SWEET switch is located in 

the front of the hood, above and to the left of the 
brew funnel.

Test Procedure:
1.  Disconnect the brewer from the power source.
2.  With a voltmeter, check the voltage across the 

black wire and white wire on the selector switch.

3.  Connect the brewer to the power source. The 

indication must be:

 

a) 120 volts ac for two wire 120 volt models.

 

b) 230 volts ac for two wire 230 volt models.

 

c) 100 volts ac for two wire 100 volt models.

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 the Wir-
ing Diagrams and check the wiring harness.

5.  Disconnect the black and white wires from the 

center terminals.

6.  Disconnect the brown/white and white/violet wires 

from the right side terminals.

7.  Check for continuity across the center and right 

terminals in rows one through four when the 
switch is in the "SWEET” position.

If continuity is present as described, replace the wires 
on the right side and proceed to #8.
If continuity is not present as described, replace the 
switch.

8.  Disconnect the white/violet wires on the left side 

terminal.

9.  Check for continuity across the center and left 

side terminals in rows one through four when the 
switch is in the "UNSWEET” position.

If continuity is present as described, replace the wires 
the switch is operating properly.
If continuity is not present as described, replace the 
switch.

Removal and Replacement:
1.  Remove the wires from the switch terminals.
2.  Compress the clips inside the hood and gently 

push the switch through the opening.

3.  Push the new switch into the opening and spread 

the clips to hold the switch captive in the hood.

4.  Refer to FIG. 19 when reconnecting the wires.

BLK to Power Cord

BRN/WHI to
Sweetener Sol

WHT/GRN to
Brew Sol

WHT/VIO 
to Brew 
Timer TL1

WHT to Power Cord