Bunn Fast Cup Series Service & Repair Manual page 74

LEFT PANEL
Qty-2 - Solenoid Valves, 2 Way Normally Open
Purpose: The coil energizes creating a magnetic
field to work against a spring force pivot mounted
lever that has a paddle style seal attached to the pivot
mount which will move, closing the port during coil
activation and will return paddle back to position by
spring force when coil is de-energized.
Note: Normally Closed & Open Solenoid Valve physi-
cally look the same on the outside.
Normally Open Solenoid Valves
13) Brew Chamber Drain Valve
15) Brew Chamber Vent Valve
TEST INSTRUCTION
Enter Service Technician Mode and Select
Service icon
Step 1: Select and enter the Water System tab.
Step 2: Touch any of the normally open valve
buttons to activate the solenoid valve.
Step 3: Monitor the center plunger for movement
and/or click sound.
Yes - Electrically the solenoid valve is work-
ing but water or product may not be flow-
ing through valve because of an internal
blockage. Valve will need to be taken apart,
cleaned and rebuilt.
No click sound or movement - Go to Volt-
age Check before replacing solenoid valve.
Volt/Ohm Meter - Voltage Check
Step 4: Disconnect or unplug machine from power.
Step 5: Remove left & right panel to access water
system and circuit boards.
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
SERVICE
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