Bunn Fast Cup Series Service & Repair Manual page 39

TOP PANEL
Step 5: Remove right panel to access circuit
boards.
Step 6: The best place to check for voltage is at
J18-9 Pin Connector on the Input/Output
board.
Step 7: LED - Emitter Information
I
nput/Output Board J18 Connector
Left Hopper - J18-1 (+) and J18-3 (-) is
1.20VDC
Center Hopper - J18-4 (+) and J18-6 (-) is
1.20 VDC
Right Hopper - J18-7 (+) and J18-9 (-) is
1.20VDC
hoto Transistor/Receiver Information
P
Signal
Empty Hopper - 0.73VDC
Not Empty Hopper - 4.69VDC
Left Hopper - J18-1 (+) and J18-2 (-)
Range: 0.73 to 4.69VDC
Center Hopper -J18-1(+) and J18-2(-)
Range: 0.73 to 4.69VDC
Right Hopper -J18-1 (+) and J18-2 (-)
Range: 0.73 to 4.69VDC
PART RELATES TO THE FOLLOWING SYMPTOMS
• Coffee profile is weak
• Message - Check Left, Center, or right Hopper -
Out of beans
SERVICE
7
39
6
5