Bunn Fast Cup Series Service & Repair Manual page 94

REAR PANEL
Step 7: Locate J18 connector on the High voltage
board.
Step 8: Connect power to machine.
Enter Service Technician Mode and Select
Service icon
Step 9: Select and enter the Grinders tab.
Step 10: Check for 290.0VDC at corresponding
grinder motor 4 pin connector or at
J18 connector on the High Voltage board.
Step 11: Set volt meter on D/C voltage. Install red
meter on J18-4 Red/BLK wire (+) and black
meter lead on J18-6 WHI/VIO, J18-7 WHI/
GRN or J18-5 WHI/YEL (-) wire.
Grinder Motor I/O Connector & Terminal #
J18-4 Red/BLK (+) and J18-6 WHT/VIO (-)
Left
J18-4 Red/BLK (+) and J18-7 WHT/GRN (-)
Center
J18-4 Red/BLK (+) and J18-5 WHT/YEL (-)
Right
Step 12: Touch and hold the corresponding Grinder
Motor button.
Step 13: The volt meter should read between 270 -
290VDC.
No voltage present - Ensure grinder circuit
breaker is not tripped before replacing High
Voltage board.
Yes voltage present & motor does not
operate - Replace grinder motor.
PART RELATES TO THE FOLLOWING SYMPTOMS
• Message - An issue has been detected with the
left grinder (can indicate center and right grinder
too)
• Brew starts and then aborts/cancels
• Active Notice - E-030, 032, 034 - Left, Right or
Center Grinder No Current
SERVICE
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