Bunn C - Manual (Page 26)

Page 26
DIGITAL BREW TIMER (Late Models)
FIG. 26-1 DIGITAL BREW TIMER
SERVICE (cont.)
Location:
The timer is located inside the front of the trunk
on the upper right side of component bracket.
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. With a voltmeter, check the supply 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 and
three wire 120/240 volt models.
b) 200 to 240 volts ac on two wire 200 volt or
240 volt models.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the wiring harness.
4. With a voltmeter, check the output voltage across
terminals TL2 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 and
three wire 120/240 volt models.
b) 200 to 240 volts ac for two wire 200 volt or 240
volt models.
If voltage is present as described, the timer is operat-
ing properly. Reset the timer as required, to obtain the
desired brew volume.
If voltage is not present as described, proceed to
#6.
6. With a voltmeter, check the input start voltage
across terminals TL2 and TL5 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 and
three wire 120/240 volt models.
b) 200 to 240 volts ac on two wire 200 volt or
240 volt models.
If voltage is not present as described, refer to the
Wiring Diagrams and check the wiring harness to the
start switch.
If voltage is 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 mounting bracket.
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. 21 when reconnecting the
wires.
5. Install new circuit board with spacers (as required)
to the component mounting bracket.
6. Adjust the timer as described in the next sec-
tion.
41711.1 052009