Pump Port Test, Single Group
Testing Pump Port on Circuit Board
Time Needed: 10 Minutes
Tools Needed: #2 Phillips Screwdriver
Multi meter
Step 1: Get to the Circuit Board
#1 - Main power - 24v DC from power supply
Remove the cup tray
Unscrew the two screws below the display and rock back the back panel
Keep the display plugged in and rest the back panel where you can reach it and won't get damaged
#2 - Relay
#3 - Display ribbon cable
#4 - Transducer
#5 - Level probe
#6 - Switches
#7 - RTD
#8 - Pump
#9 - Solenoids
Locate the circuit board and disconnect #8
Step 2: Test Pump Port on Circuit Board
Where the pump plugs into the board we are going to work from top to bottom with numbers 1, 2, 3, & 4.
You should have a constant 24 vdc from the #1 and #4 spots and a constant 18.5 dcv from #1 and #2.
Measuring #3 & #4 will give you the signal voltage that will increase as you increase the pump pressure.
Put in a blind and measure #3 & #4 and have someone increase the pump pressure.
you should see the 1.2 or so volts increase.
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