Bunn Ultra NX Service & Repair Manual page 30

Membrane Switch
FIG. 3 MEMBRANE SWITCH
Part Removal and Replacement:
1. Disconnect the dispenser from the power
source.
2. Remove right and left side panels.
3. Remove front panel and disconnect membrane
switch ribbon from wiring harness.
4. Open the restraint clamp securing the
membrane switch ribbon.
4. Peel the old membrane switch off the front
panel and discard. Clean any remaining
adhesive from front panel with mineral spirits
and then alcohol.
5. Remove protective paper backing from back
side of new membrane switch.
6. Guide ribbon cable through narrow slot in panel.
Carefully position new membrane switch on
panel, while centering display window to
opening.
7. Reconnect the ribbon cable to the short wiring
harness from the Control Board.
NOTE: The black wire in wiring harness should
correspond to the #1 side printed on the clear
portion of the ribbon cable.
8. Close the restraint clamp securing the
membrane switch ribbon.
NOTE: Before continuing, check that the ribbon
cable is properly connected to the control board
wiring harness and not a pin off in either
direction.
SERVICE - FRONT PANEL COMPONENTS
30