Section 6: The Coffee System 3033-006B
6-12 Concordia Xpress Technical Support Manual
2900-300B
Left Piston
The left piston is also referred to as the coffee piston or the lower piston.
When coffee is ground and delivered into the brew chamber, the left
piston moves up to pack the coffee against the right brew piston.
Right Piston
The right piston is also referred to as the brew piston or the upper piston.
During an extraction, the brew water passes through this upper piston,
through the ground coffee, through the coffee piston, and out of the brew
chamber via tubing to be dispensed into the cup.
Piston Movement
Once the CPU detects the piston location using the fixed Hall-Effect
sensors, it continues to monitor piston position using the rotational Hall-
Effect sensors located in the motors.
The CPU monitors the rotations of the motor and is programmed to
associate “X” number of rotations with piston movement.
Magnet Passes by Sensor
As piston moves up
102-68 Hall-Effect Sensor
Hall-Effect Sensor 100-71
Piston location viewed in TEST ROUTINES
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