Bunn -O-MATIC ULTRA-1 - Manual (Page 54)

54
SERVICE (cont.)
TRANSFORMER
FIG. 67 TRANSFORMER TERMINALS
FIG. 65 TRANSFORMER - ULTRA-1
Location:
The transformer is located inside dispenser onthe lower
right side of the chassis.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Remove right side panel.
3. Connect the dispenser to the power source.
4. Connect a voltmeter from the WHI/BLU wire to the
WHI/BLK wire on the transformer.
The indication must be:
a) Aprox. 12.6 volts ac.
If voltage is present as described, the transformer is
working properly.
If voltage is not present as described, refer to the Wiring
Diagrams and check the main wiring harness.
5. Connect a voltmeter from the WHI wire to the BLK
wire on the transformer.
The indication must be:
a) 120 volts ac for 120 volt models.
b) 230 volts ac for 230 volt models.
If voltage is present as described, replace trans-
former.
If voltage is not present as described, refer to the Wiring
Diagrams and check the main wiring harness.
Removal and Replacement:
1. Disconnect the dispenser from the power source.
2. Remove right side panel.
3. Disconnect the four wires from transformer.
4. Disconnect the wiring harness from the plug on the
transformer.
5. Remove the two #8-32 nuts securing the trans-
former to the chassis base. Remove transformer
and discard.
6. Position new transformer on the chassis base, and
secure with two #8-32 nuts.
7. Refer to Fig. 67 and reconnect the wires.
-LINE-
R
-LINE
-
Ultra-1 WHI/GRY to Main Harness
Ultra-2 WHI/BLK to Main Harness
BLK to Main Harness
WHI to Main Harness
WHI/BLU to
Main Harness
“LOAD”
“LINE”
FIG. 66 TRANSFORMER - ULTRA-2
41084 102709