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Bunn TB3 User Guide

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Page 18
SERVICE (cont.)
DIGITAL BREW TIMER
4
2
3
1
M
IN
UT
ES
M
IN
UT
ES
M
IN
UT
ES
M
IN
UT
ES
DE
LA
Y 
   
   
 D
IL
UT
IO
N
DE
LA
Y 
   
   
 D
IL
UT
IO
N
BU
NN
-O
-M
AT
IC
BU
NN
-O
-M
AT
IC
P/
N 
33
55
P/
N 
33
55
5
3
6
4
7
5
6
6
7
8
FIG. 6 DIGITAL BREW TIMER
P3040
Location:
 
The timer is located in the hood, on the left side.
Test Procedure:.
NOTE: Do not remove or install wires while timer board 
is installed. Pressure applied to one side may cause 
damage to the board.
1.  Disconnect the brewer from the power source and 
remove the front access panel.
2.  Remove the two #8-32 screws securing circuit 
board to the mounting bracket.
3.  Remove circuit board and spacers (as required).
4.  With a voltmeter, check the voltage across terminals 
TL1 and TL2 when the "ON/OFF" switch is in the 
"ON" position. 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.
5.  Disconnect the brewer from the power source.
If voltage is present as described, proceed to #6.
If voltage is not present as described, refer to the Wiring 
Diagrams and check the brewer wiring harness.
6.  With a voltmeter, check the voltage across terminals 
TL1 and TL4 when the "ON/OFF" switch is in the 
"ON" position. Connect the brewer to the power 
source. The indication must be 0 volts.
If voltage is as described, proceed to #7.
If voltage is not as described, disconnect the brewer 
from the power source and replace the timer.
7.  With a voltmeter, check the voltage across ter-
minals TL1 and TL4 when the "ON/OFF" switch 
is in the "ON" position. Connect the brewer to the 
power source and press the "START" switch. The 
indication must be as follows:
 
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.
If voltage is present as described, the brew timer is 
operating properly. Reset the timer as required, to 
obtain the desired brew volume.
If voltage is not present as described, disconnect the 
brewer from the power source and replace the timer.
Removal and Replacement:
1.  Remove the two #8-32 screws securing circuit 
board to the hood.
2.  Remove circuit board and spacers (as required).
3.  Remove all wires from the timer.
4.  Attach all wires to the replacement timer board 
prior to installation to the component mounting 
bracket.  Refer to FIG. 7 when reconnecting the 
wires.
5.  Install new circuit board with spacers (as required) 
to the component mounting bracket.
6.  Adjust the timer as described below.
Timer Setting:
NOTE: Prior to setting or modifying volumes, check 
that the brewer is connected to water supply, the 
tank is properly fi lled, and a funnel and server are in 
place.
NOTE:  All volume settings must be done with the 
sprayhead installed.
1.  Modifying brew volumes. To modify a brew vol-
ume, fi rst check that the SET/LOCK switch is in the 
"SET" position on the circuit board.
37235  080204