Bunn U3 Manuales De Servicio
Page 3
SERVICE (cont.)
TIMER (Early Models)(cont.)
5. With a voltmeter, check the voltage across the
TIMER (Early Models)(cont.)
5. With a voltmeter, check the voltage across the
sockets P1 and P (blue and white wires) of the
female connector on the main harness when the
"ON/OFF" switch is in the "ON" (upper) position
and the start switch pressed. Connect the brewer
to the power source. The indication must be:
a) 10 volts ac for three wire 10/08 volt, 10/40
volt, 380 volt models and 08 or 40 volt ac for
four wire 440 volt models.
b) 08 volts ac for two and three wire 08 volt
models.
c) 40 volts ac for two and three wire 40 volt
models.
d) 30 volts ac for two wire 30 volt CE models.
6. Disconnect the brewer from the power source.
7. Reconnect the three pin connector from the main
wiring harness to the connector on the timer.
If voltage is present as described, proceed to #8.
If voltage is not present as described, refer to the Wiring
Diagrams and check the brewer wiring harness.
8. Disconnect the black and white wires to the
pump.
9. With a voltmeter, check the voltage across the
black and white wires when the "ON/OFF" switch
is in the "ON" (upper) position and the start switch
pressed to the start position and released. Connect
the brewer to the power source. The indication
must be:
a) 10 volts ac for three wire 10/08 volt, 10/40
volt, 380 volt and 08 or 40 volt ac for four wire
440 volt models.
b) 08 volts ac for two and three wire 08 volt
models.
c) 40 volts ac for two and three wire 40 volt
models.
d) 30 volts ac for two wire 30 volt CE models.
If voltage is present as described, the brew timer is
operating properly. Reset the timer dial as required,
to obtain the desired brew volume.
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.
. Disconnect the timer leads from the pump
leads.
3. Remove the two #8-3 screws securing the brew
timer to the component bracket and remove
timer.
4. Install new timer circuit board as described in Late
Model Timer section on the following pages.
5. Refer to Fig. 33 to reconnect the wires.
6. Install the Timer Setting Decal, provided with the
timer replacement kit, on the back of the front
access panel.
7. Adjust the timer as required. Refer to Late Model
Timer section on the following pages.
To Three Pin Female
Connector on Main
Harness
BLK to Pump
Lead
WHI to Pump Lead
Three Pin Connector from
Half/Full Batch Switch
FIG. 31 TIMER TERMINALS
P1751
10060 080900
OLD STYLE