Bunn Fast Cup Series Service & Repair Manual page 73

LEFT PANEL
Step 6: Locate J20 connector on the Input/Output
board.
Step 7: Connect power to machine.
Step 8: Set voltmeter on D/C voltage. Install red
meter lead on terminal J20-x WHI/xx
wire (positive) and black meter lead on
J20-x WHI/BLK wire (negative) terminal.
Solenoid Valve
Normally Closed
Inlet
Ambient Bypass
Brew Tank Drain
Hot Water Bypass
Brew Chamber Dispense
Brew Chamber Fill
Brew Chamber Cleaning
Step 9: The reading should be 24.0VDC when
activated in Step 2.
Voltage present - Replace Solenoid valve.
Voltage not present - Check wiring harness
for loose connection between solenoid
valve and J20 connector on Input/Output
board before replacing I/O board.
PART RELATES TO THE FOLLOWING SYMPTOMS
• Active Notice - E-xxx: Currently no error or event
code for Solenoid Valves
SERVICE
I/O Con-
Terminal #
nector #
J20 J20-9 & J20-18
J20 J20-1 & J20-10
J20 J20-7 & J20-16
J20 J20-2 & J20-11
J20 J20-4 & J20-13
J20 J20-6 & J20-15
J20 J20-8 & J20-17
Water System Panel Angle View
Normally Closed valves
208VAC 2 WIRE + GND
SINGLE PHASE
56640.0000A 08/19 ©2019 BUNN-O-MATIC CORPORATION
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OPTIONAL
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19 10
16
11
18
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