Bunn Fast Cup Series Service & Repair Manual page 84

RIGHT PANEL
Universal Power Supply 24VDC
Purpose: The power supply accepts an incoming
voltage range of 88 to 264vac and steps and con-
verts it down to a low output D/C voltage. The unit is
adjusted by the potentiometer to put out 24.0VDC.
The 24VDC goes to the High Voltage Board and to
the Input/Output board.
TEST INSTRUCTION
Volt/Ohm Meter - Voltage Check
Step 1: Disconnect or unplug machine from power.
Step 2: Remove right panel to access power supply
board board/24VDC.
Step 3: Connect power to machine.
Step 4: Enable main On/Off switch.
Step 5: Locate the LED on the left power supply
board (24VDC). An illuminated green led
indicates the unit has incoming power.
Step 6: Check input voltage at the power supply.
Step 7: Set volt meter on 600VAC, install red
meter lead on terminal labeled "L" and black
meter lead on terminal labeled "N". Reading
must be 208VAC.
Step 8: No 208VAC input - First, verify main power
supply and go to Main On/Off switch test
instruction.
Step 9: Next, check the output voltage at the power
supply.
Step 10: Set volt meter on 200VDC, install red
meter lead on positive (+) terminal and
black meter lead on negative (-) terminal.
Reading must be 24VDC.
Note: Potentiometer adjustment screw
on power board is an adjustment for the
output voltage.
Step 11: No 24.0VDC output - replace power supply.
Note: 24.0VDC present but is interrupted
going to High Voltage board. See Active
Notice icon for Event Codes.
PART RELATES TO THE FOLLOWING SYMPTOMS
• User display is not illuminated
• Power supply green led is not illuminated
• High Voltage Board All Status LED's Not Illumi-
nated
SERVICE
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