Bunn FMDA DBC-3 User Guide
23
If voltage is present as described, proceed to step 16.
If the voltage is not present as described, replace the
control circuit board.
If the voltage is not present as described, replace the
control circuit board.
16. Reconnect the eight pin connector of the wiring
harness to J1 of the control board.
17. Gently pull the liquid level probe out of the tank lid
and inspect for corrosion. Replace it if necessary.
18. Place the probe so that neither end is in contact
with any metal surface of the dispenser.
19. With a voltmeter check the voltage across the
terminals of the inlet solenoid valve. Connect the
dispenser to the power source. After a 10 second
delay, the indication must be :
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 or 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
dispenser to the power source. After a 10 second
delay, the indication must be :
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 or 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
20. Move the probe’s flat end to the dispenser hous-
ing. The indication must be 0.
21. Move the probe’s flat end away from the housing.
After a 5 second delay, the indication must, again,
be:
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 or 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
be:
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for three wire 120/208 or 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
22. Disconnect the dispenser from the power source.
If the voltage is present as described, re-install the
probe. The liquid level control circuitry is operating
properly.
If the voltage is not present as described, check the
pink probe wire and green tank wire for continuity and
overflow protection switch (page 33).
probe. The liquid level control circuitry is operating
properly.
If the voltage is not present as described, check the
pink probe wire and green tank wire for continuity and
overflow protection switch (page 33).
Hopper Motor Control Circuitry:
1. Disconnect the dispenser from the power source.
2. Disconnect the eight pin connector from J1 of the
1. Disconnect the dispenser from the power source.
2. Disconnect the eight pin connector from J1 of the
control board.
3. With the voltmeter check the voltage across pins
1 & 2 of the eight pin connector on the wiring
harness. Connect the dispenser to the power
source. The indication must be 24 volts ac.
harness. Connect the dispenser to the power
source. The indication must be 24 volts ac.
4. Disconnect the dispenser from the power source.
SERVICE (cont.)
CONTROL BOARD (cont.)
If voltage is present as described, proceed to step 5.
If voltage is not present as described, refer to the
wiring diagram and check the dispenser wiring har-
ness.
If voltage is not present as described, refer to the
wiring diagram and check the dispenser wiring har-
ness.
5. Reconnect the eight pin connector of the wiring
harness to J1 of the control board.
6. Check that the “Rinse/Run” switch is in the “Run”
position.
7. With a voltmeter check the voltage across the red
(+) terminal and the black (-) terminal of the auger
motor. Connect the dispenser to the power source.
Press the appropriate dispense switch. After a
delay of about .6 seconds, the indication must be
between +4.0 and +24.5 volts dc.
motor. Connect the dispenser to the power source.
Press the appropriate dispense switch. After a
delay of about .6 seconds, the indication must be
between +4.0 and +24.5 volts dc.
If the voltage is present as described, the hopper
motor control circuitry is operating properly.
If the voltage is not present as described, replace the
control circuit board.
motor control circuitry is operating properly.
If the voltage is not present as described, replace the
control circuit board.
Whipper Motor and Dispense Solenoid Circuitry:
1. Disconnect the dispenser from the power source.
2. Disconnect the eight pin connector from J1 of the
1. Disconnect the dispenser from the power source.
2. Disconnect the eight pin connector from J1 of the
control board.
3. With a voltmeter check the voltage across pins 1 &
2 of the eight pin connector on the wiring harness.
Connect the dispenser to the power source. The
indication must be 24 volts ac.
Connect the dispenser to the power source. The
indication must be 24 volts ac.
4. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to step 5.
If voltage is not present as described, refer to the
wiring diagram and check the dispenser wiring har-
ness.
If voltage is not present as described, refer to the
wiring diagram and check the dispenser wiring har-
ness.
5. Reconnect the eight pin connector of the wiring
harness to J1 of the control board.
6. Check that the RINSE/RUN switch is in the “Rinse”
position.
7. Disconnect the six pin connector from J2 of the
control board.
8. With a voltmeter check the voltage across pins 2 &
4 of the six pin connector on the wiring harness.
Connect the dispenser to the power source. The
indication must be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 or 120/240
volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
Connect the dispenser to the power source. The
indication must be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for three wire 120/208 or 120/240
volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.
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