Bunn VLPF Operating & Service Manual page 15

SERVICE (cont.)
BREW TIMER (cont.)(late models)
FIG. 4 BREW TIMER
Location:
The brew timer is located in the hood, to the right
of the tank.
Test Procedures:
1. Disconnect the brewer from the power source and
remove the top cover.
2. With a voltmeter, check the voltage across termi-
nals TL1 and TL2 when the "ON/OFF" switch is
in the "ON" position. Connect the brewer to the
power source. The indication must be 120 volts
ac.
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 Diagram and check the brewer wiring harness.
4. Disconnect the white/blue wire from terminal TL3
and the blue wire from terminal TL5. Check for
continuity across the two wires when the start
switch is pressed to the "START" position.
If continuity is present as described, reconnect the
wires and proceed to #5.
If continuity is not present as described, refer to the
Wiring Diagram and check the brewer wiring har-
ness.
5. With a voltmeter, check the voltage across termi-
nals 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 #6.
If voltage is not as described, disconnect the brewer
from the power source and replace the timer.
6. 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 120 volts ac.
P2172.80
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:
NOTE: Do not remove or install wires while timer board
is installed. Pressure applied to one side may cause
damage to the board.
1. Remove the two #8-32 nuts 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. 5 when reconnecting the
wires.
5. Install new circuit board with spacers (as required)
to the hood.
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 filled, and a funnel and server are in
place.
NOTE: All volume settings must be done with the
sprayhead installed.
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