Bunn Fast Cup Series Service & Repair Manual page 83

RIGHT PANEL
High Voltage Board
Purpose: The H/V board receives and interprets
the input data it receives from the user touchscreen
assembly, resulting in a series of outputs to operate
components.
High Voltage Board
270VDC 48VDC 24VDC
Solid
R,C,L Water State
Grinder Pump Relay
Control
Brew
Motor
TEST INSTRUCTION
Enter Service Technician Mode and Select
Service icon
Step 1: Select and enter the Voltage/Current tab.
Step 2: You can view the H/V board internal volt-
ages and the protected output circuit volt-
ages.
Volt/Ohm Meter - Voltage Check
Step 3: Disconnect or unplug machine from power.
Step 4: Remove right panel to access circuit
boards.
Step 5: Locate J11 connector on the High Voltage
board.
Step 6: Connect power to machine.
Step 7: Enable main On/Off switch.
Step 8: Set voltmeter on D/C voltage. Install red
meter lead on terminal J11-1 WHI/RED
wire (positive) and black meter lead on
J11-4 WHI/BLK wire (negative) terminal.
The voltage reading should be 24.0VDC.
Step 9: Set voltmeter on D/C voltage. Install red
meter lead on terminal J11-2 RED wire
(positive) and black meter lead on J11-6
BLK wire (negative) terminal.
The voltage reading should be 48.0VDC.
PART RELATES TO THE FOLLOWING SYMPTOMS
• No 24VDC - H/V Board LED's not illuminated
• No 48VDC - H/V Board LED labeled 48V will not
be illuminated
SERVICE
16VDC 5VDC 3VDC
R,C,L
R,C,L
Door Hopper
Temper-
Switch- Detect
ature
es Switch-
Sensors
es
Comm.
Brew
Motor
1
LED's
J11 Connector
8 & 9
83
1
2