Bunn Fast Cup Series Service & Repair Manual page 32

UPPER DOOR COVER
Dispense Block Assembly
Purpose: The dispense block has two recessed blue
LED's within the block. A laminar nozzle aerates the
product flow thus creating a non-splashing stream
entering the coffee cup.
TEST INSTRUCTION
Volt/Ohm Meter - Voltage Check
LED
Ensure brewer is powered and upper and lower door
are closed. The blue LED's must be illuminated. If
one door switch is open or defective, the blue LED
will not be illuminated.
Note: The best place to check for power is at J9 con-
nector on the Input/Output board.
A total of 3 connectors exists after the I/O board
to power the LED's that are located in the dispense
block that is mounted in the upper door.
Be aware of the number of connectors as a loose
connection could exist other than LED or Power Out-
put failure. The LED's are in series, If one LED goes
out they both will be out.
Step 1: Disconnect or unplug machine from power.
Step 2: Remove right panel to access circuit
boards.
Step 3: Locate J9 connector on the Input/Output
board. Connect machine to power.
Step 4: Set voltmeter on D/C voltage. Install red
meter lead on terminal J9-1 White wire
(positive) and the black meter lead on J9-2
Blue wire (negative) terminal.
Step 5: If the reading is 24.0VDC, check for loose
connection before replacing a failed LED.
Voltage Output Not Present: Replace
I/O board.
Nozzle
Step 6: Irregular dispense, unscrew nozzle and
clean internal parts before reassembly.
PART RELATES TO THE FOLLOWING SYMPTOM
• Irregular or erratic spray during dispense
• No LED illumination over coffee cup
SERVICE
DOOR
FAN
BUNNLINK
WIRELESS
RED RED RED/WHT
1
YEL
BOARD YEL YEL
BLU BLU BLU
BLK BLK WHT/BLK
ADA 1
BRN BRN
BLK
1
1
RED RED
BRN
MEMBRANE
ORN
ORN
RED
BLK BLK
SWITCH ORN
YEL YEL YEL
WHT WHT WHT
BLU BLU BLU
J25
WHT
LED
RED/BLK
ASSY
RED/BLK
LED
BLU
ASSY
ORN/BLK
RED
WHT
BLU/WHT
BLK
GRN/BLK
TOUCH-
SCREEN
DISPLAY
1
RED/BLK
BLU/BLK
GRN
BLU
YEL
RED
BLK
BLK/WHT
CHILLER
OUT
VALVE
WHT/BLK
SOL
AMBIENT BYPASS
VALVE
WHT/BLK
SOL
HOT WATER
BYPASS VALVE
WHT/BLK ORN
SOL
BREW VENT
VALVE
WHT/BLK WHT/BLU
SOL
DISPENSE
VALVE
WHT/GRN
WHT/BLK
SOL
BREW DRAIN
VALVE
WHT/BLK BLU
SOL
BREW
VALVE
WHT/BLK TAN
SOL
TANK PURGE
VALVE
GRAY
WHT/BLK
SOL
TOP CLEAN
VALVE
WHT/BLK
YEL
SOL
INLET
VALVE
WHT/YEL
WHT/BLK
SOL
32
6
LED
RED
REAR
WHT
BLK
FAN
5
DOOR
WIRE
HARNESS
DISPLAY
CIRCUIT
GRN/WHT
ORN
BREAKER
WHT
BLU
RED
BLK 5
BLK/WHT
RED/BLK
GRN
BLU/BLK
ORN/BLK
BLU/WHT
GRN/BLK
RED/WHT
WHT/BLK
CHILLER
IN VALVE
WHT/BLK PINK
SOL
WHT/VIO
CHILLER WATER
VALVE
WHT/GRAY WHT/BLK
SOL
VIO
WHT/RED
FLOW 1
WHT/BLK
1
IO-J23
1
RED
WHT
BLK
BLK
IO-J19
RED
WHT
WHT
1
BLU
IO-J18
4
IO-J9
RED
RED
5
IO-J4
RED
1
IO-J17
BLK
BLK/WHT
RED/BLK
1
GRN
IO-J15
BLU/BLK
I
/
RED/WHT
1
IO-J31
WHT/BLK O IO-J2
B
O
PINK
1 A
WHT/VIO
WHT/GRAY
R
WHT
IO-J8
WHT/BLK
WHT/BLK D
WHT/BLK
WHT
IO-J1
VIO
1
ORN
WHT/BLU
WHT/GRN
BLU
TAN
GRAY
YEL
IO-J20
WHT/YEL
WHT/BLK
WHT/BLK
WHT/BLK
WHT/BLK
WHT/BLK
WHT/BLK
WHT/BLK
WHT/BLK
WHT/BLK
RED/BLU
1
PINK
WHT/BLK
TAN IO-J13
WHT/RED
WHT
GRN
BLK
BLU
IO-J21
1
BLK
IO-J11
YEL
RED 1
WH
WHT/RED