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.
Related Articles
Pump Adjustment - Espresso Single Group (January 2020 or later)
Adjust rotary pump on Espresso Single Group (January 2020 or later) Time: 10 minutes Tools: Flathead Screwdriver #2 Phillips Head Screw Driver Or Multi-Screwdriver (pictured) Press circle to enter into programming Scroll to pump percentage, confirm ...Single Group Pump Reset
Unplug the machine. Take the cup tray off. Remove the back panel. Follow the wire from the pump to the board. Below is a photo of which port the pump plug goes in. Unplug the pump plug and leave unplugged for two minutes. Plug the pump back in, ...RTD Test, Single Group
RTD Test, Single Group This procedure tests the resistance of the RTD. The RTD measures the temperature of the brewing group. As the machine fluctuates in temperature, the resistance will change sending a signal to the board to heat or not heat the ...Pump Adjustment - Universal
Setting & Adjusting Rotary Vane Pump - Commercial Objective: SLAYER two and three group commercial machines feature an external rotary vane pump. With an adjustable bypass screw, a technician can easily adjust the pump pressure of the brew circuit. ...Hard Reset - Single Group
Hard Reset, Single Group Step 1: Press circle to enter programming Scroll to Advanced Settings and circle to enter Scroll to menu option Save/Restore settings, press circle to enter Arrow up to Reset Factory Default Press circle, arrow to yes, press ...