Transformer-Lited Doors - Bunn Silver Series Service & Repair Manual

SERVICE (CONT.)
Transformer - Lited Doors (JDF-2S, JDF-4S)
C
A
C
A
FIG. 71 TRANSFORMER
Location:
The transformer is located on the electrical com-
ponent mounting bracket on the lower front of the
dispenser behind the splash panel.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Disconnect the four pin plug from the main harness
from the four pin connector on the transformer.
3 Check the voltage across black wire pin 1 and the
white wire pin 2 on the plug from the main har-
ness. Connect the dispenser to power source. The
indication must be:
a) 120 volts ac for two wire 120 volt models, three
wire 120/208 volt and three wire 120/240 volt
models.
b) 240 volts ac for two wire 240 volt models.
c) 230 volts ac for two wire 230 volt models.
4. Disconnect the dispenser from the power source.
If voltage is present as described reconnect the plug
and the connector and proceed to #5.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the main wiring harness.
5. Check the voltage between J3-5 and J3-6 on the
six pin connector at the control board. Connect 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.
Removal and Replacement:
1. Loosen the two #8-32 screws securing the com-
ponent bracket to the dispenser housing base.
2. Pull component bracket out the front of the dispenser
far enough so the transformer connector can be
disconnected from the main wiring harness.
3 Disconnect the transformer four pin connector from
the four pin plug on the main wiring harness.
4. Remove the two #6-32 keps nuts securing the
transformer to the component bracket.
5. Remove and discard the transformer.
P3864
6. Install new transformer on the component bracket
and secure with two #6-32 keps nuts.
7. Connect the four pin connector on the transformer
to four pin plug on the main wiring harness.
8. Place the component bracket into position and
tighten the two #8-32 screws.
WHI/GRN - T8
WHI/BLK - T12
FIG. 72 TRANSFORMER TERMINALS
52
WHI - 120V T2, 240V T6
BLK - TI
P1647
49179 110613