Water Pump Assembly - Bunn Fast Cup Series Service & Repair Manual

REAR PANEL

Water Pump Assembly

Purpose: The variable speed precision pump as-
sembly is used to maintain flow rate during brewer
operation by indirectly increasing or decreasing
pump motor rpm.
TEST INSTRUCTION
Volt/Ohm Meter - Voltage Check
Step 1: Disconnect or unplug machine from power.
Step 2: Remove right & rear panel to access power
boards & water pump.
Step 3: Connect power to machine.
Step 4: Enable main On/Off switch.
Step 5: Check pump motor for voltage coming
from J16 connector on the High Voltage
board. The reading should be 48.0VDC.
Step 6: Set voltmeter on D/C voltage. Install red
meter lead on terminal J16-1 (+) BRN
wire terminal and black meter lead on
J16-3 (-) BLK wire terminal.
Step 7: No 48.0VDC - First, check H/V board
for incoming 48.0VDC from the power sup-
ply before replacing H/V board.
Yes 48.0VDC - Go to Step 8 thru 10.
Step 8: Next, check water pump control voltage at
J13 connector on the Input/Output board.
The reading should be 24.0VDC.
Step 9: Set voltmeter on D/C voltage. Install red
meter lead on terminal J13-1 (+) RED/BLU
wire terminal and black meter lead on
J13-11 (-) BLK wire terminal.
Step 10: No 24.0VDC - First, check Input/Output
board for incoming 24.0VDC from the
power supply before replacing I/O board.
Yes 24.0VDC - Go to Step 11 thru 15
SERVICE
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