Piston Motor - Bunn Fast Cup Series Service & Repair Manual

LOWER FRONT PANEL

Piston Motor

Purpose: A precision motor that moves the upper
piston up or down in millimeter increments, staging
the upper piston throughout an entire brew or clean
process.
TEST INSTRUCTION
Note: The brewer software controls an incremental
process of moving the upper piston within the brew
chamber during a brew process and during testing
purposes.
Piston Motor LED Indicator
Green - Enabled to run
Yellow - At home position or door is open
Red - Motor error(overload)
Brew Piston Stage or Stop Points (mm)
Brew Piston Home - 0 mm, At Home, Status - Home
Brew Piston Top - 25 mm, Not Home, Status - Out of
Chamber
Brew Piston Closed - 71 mm, Status - In Chamber
Brew Piston Latch - 109 mm, Status - Latched
Swiper Removal - 8 mm, Status - Swiper Remove
Enter Service Technician Mode and Select
Service icon
Step 1: Select and enter the Brew Module tab.
Step 2: Touch each Brew Piston position buttons to
confirm each staging point number.
Step 3: Start with Brew Piston Home button and
reference the 0mm for Piston Location and
Piston Status: Home
Step 4: Continue testing each Brew Piston stage
point and reference the mm Location and
Piston Status.
Step 5: If Brew Piston Home position starts with
1mm, go to the proximity sensor test
instruction.
SERVICE
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