Bunn Fast Cup Series Service & Repair Manual page 27

LOWER DOOR COVER
ADA Membrane Switch
Purpose: People with disabilities may use the mem-
brane switch to operate the brewer touchscreen to
select, start and/or stop the brew dispense process.
TEST INSTRUCTION
Enter Service Technician Mode and Select
Service icon
Step 1: Select and enter the Sensors tab.
Step 2: When you depress an ADA button (a thru
e), the ADA Input will be highlighted with a
black box to indicate good/working button.
No highlighted black box - Failed button,
check wiring harness for continuity before
replacing ADA membrane switch.
Volt/Ohm Meter - Continuity Check
Step 3: Disconnect or unplug machine from power.
Step 4: Remove left panel to access cable
connector.
Step 5: Disconnect the connector union and keep
female molex connector in position for
continuity test.
Step 6: Set meter to read continuity/tone.
Step 7: Place black meter lead on common
terminal #4 and red meter lead on terminal
2,3,5,6, or 7.
Step 8: Depress the corresponding button being
checked, meter should show continuity
0.00 on display or here audible tone and
return back to an open connection when
depression is released from membrane
button.
No continuity -replace membrane switch.
PART RELATES TO THE FOLLOWING SYMPTOM
• No response or cursor movement on User
Touchscreen
SERVICE
Female Molex Door Cable Connector
Terminal 1 Brown Wire
Terminal 2 Red Wire...................a
Terminal 3 Orange Wire .............b
7
Terminal 4 Black Wire (Common)
Terminal 5 Yellow Wire...............c
Terminal 6 White Wire ................d
Terminal 7 Blue Wire ..................e
Terminal 8 Open
a
1
27
b c d
2
2
e