Bunn FMD-4 User Manual
41
J4
J1
J2
J3
J4
J1
J2
J3
TRANSFORMER
FIG. 41 TRANSFORMER
P2635
Location:
The transformer is located behind the lower front
access cover, mounted on the right rear side of the
component bracket.
component bracket.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnect the four wires of the main harness
1. Disconnect the dispenser from the power source.
2. Disconnect the four wires of the main harness
from the transformer.
3
Check the voltage across black wire and the white
wire on the main harness. Connect the dispenser
to power source. The indication must be:
a. 120 volts ac for two wire 120 volt models.
b. 120 volts for three wire 120/208 volt models and
three wire 120/240 volt models.
wire on the main harness. Connect the dispenser
to power source. The indication must be:
a. 120 volts ac for two wire 120 volt models.
b. 120 volts for three wire 120/208 volt models and
three wire 120/240 volt models.
4. Disconnect the dispenser from the power source.
If voltage is present as described reconnect the wires
and proceed to #5.
If voltage is not present as described, refer to the
wiring diagrams and check the main wiring harness.
and proceed to #5.
If voltage is not present as described, refer to the
wiring diagrams and check the main wiring harness.
5. Check the voltage between J3-5 and J3-6 on the
six pin connector at either control board. Connect
the dispenser to the power source. The indication
must be 24 volts ac.
the dispenser to the power source. The indication
must be 24 volts ac.
If voltage is present as described the transformer is
operating properly.
If voltage is not present as described, replace the
transformer.
operating properly.
If voltage is not present as described, replace the
transformer.
Removal and Replacement:
1. Loosen the three #8-32 screws securing the com-
1. Loosen the three #8-32 screws securing the com-
ponent bracket to the dispenser housing base.
2. Pull component bracket out the front of the dis-
penser far enough so the transformer can be
disconnected from the main wiring harness.
disconnected from the main wiring harness.
3
Disconnect the transformer from the main wiring
harness.
harness.
4. Remove the two #8-32 screws securing the trans-
former to the rear of the component bracket.
5. Remove and discard the transformer.
6. Install new transformer on the rear of the compo-
6. Install new transformer on the rear of the compo-
nent bracket and secure with two #8-32 screws.
7. Connect the transformer to the main wiring har-
ness (see Fig. 42).
8. Place the component bracket into position and
tighten the three #8-32 screws.
FIG. 42 TRANSFORMER TERMINALS
P2640
SERVICE (cont.)
LINE
WHI/GRN from
Main Harness
Main Harness
BLK from
Main Harness
Main Harness
WHI from
Main Harness
Main Harness
WHI/BLK from
Main Harness
Main Harness
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