Bunn Fast Cup Series Service & Repair Manual page 38

TOP PANEL
Bean Detect Sensor (Full/Empty)
Purpose: Solid state device that consists of an LED
(emitter) & photo transistor (receiver). The solid
state device is used to monitor hopper Full/Empty
status. If the brewer reads a bean hopper as being
empty, it will lock out the user from being able to
select and start a brew from that hopper/product
selection.
TEST INSTRUCTION
Enter Service Technician Mode and Select
Service icon
Step 1: Select and enter the Sensors tab.
Step 2: Remove the corresponding coffee bean
hopper being tested from the placement
station.
Note: Located right side, the following
Left, Center and Right hopper bean
detection circuit can be individually tested
for operation by manually blocking and un-
blocking the infrared light.
Step 3: Locate the slotted area in the top panel
base where the hopper was positioned. Use
and object to block and unblock the infra
red light. Observe the corresponding hop
per MV number. The MV number should go
High and Low when you block and unblock the
infrared light.
Menu Information
864MV means - Empty
3
1500MV or Lower means - Not Empty
Typical reading with coffee beans - 250
- 350MV
Note: If you have a problem with the
coffee bean detection in one circuit or all
three circuits, the coffee bean detection
feature can be disabled in Programming
under Machine Setting icon.
Volt/Ohm Meter - Voltage Check
Step 4: Disconnect or unplug machine from power.
SERVICE
LED, Infrared
Emitter
Photo Transistor/
Receiver
1
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