Timer (Early Model) - Bunn C Series Service & Repair Manual

SERVICE (cont.)
TIMER (Early Models)
To Main Wiring Harness
To Solenoid Valve
EARLY STYLE
FIG. 24-1 TIMER TERMINALS
Location:
The timer is located inside the front of the trunk
on the upper right side of component bracket.
Test Procedure.
1. Disconnect the brewer from the power source.
2. Disconnect the polarized, three pin connector from
the brewer wiring harness.
3. With a voltmeter, check the voltage across sockets
P2 & P3 (white and white/red wires) of the female
connector when the "ON/OFF" switch is in the "ON"
position (upper). 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.
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
Wiring Diagrams and check the brewer wiring har-
ness.
5. Check the voltage across the sockets P1 & P2
(blue and white wires) of the female connector
with a voltmeter when the "ON/OFF" switch is in the
"ON" position (upper) and start switch pressed.
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 for two wire 200 volt or 240
volt models.
6. Disconnect the brewer from the power source.
7. Reconnect the three pin connector from main
wiring harness to the timer.
If voltage is present as described, proceed to #8
If voltage is not present as described, refer to Wiring
Diagrams and check the start switch and brewer wir-
ing harness.
8. With a voltmeter, check the voltage across the
black and white wires when the "ON/OFF" switch
is in the "ON" position (upper) and the "START"
switch is pressed to the "START" position and
released. Connect the brewer to the power source.
The indication must be:
a) 120 volts ac for approximately 20 seconds for
two wire 120 volt models and three wire 120/240
volt models.
b) 200 to 240 volts ac for approximately 20 seconds
for two wire 200 volt or 240 volt models.
If voltage is present as described, the brew timer is
operating properly. Reconnect the polarized, three
pin connector.
If voltage is not present as described, replace the
timer.
Removal and Replacement:
1. Separate all connectors between the brewer wiring
harness and the timer.
2. Remove the one #8-32 screw securing timer to
component bracket.
3 Install new timer circuit board as described in Late
Model Timer section on the following pages.
4. Refer to Fig. 21 when reconnecting the wires.
5. Install the Timer Setting decal provided with the
replacement timer kit, below the schematic on the
inside of the front access panel.
6. Adjust the timer as required. Refer to Late Model
Timer section on the following pages.
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41711.1 052009