Saeco Xsmall Plus, Service Manual, Page: 19 / 42

Saeco Int. Rev. 00 / Jul. 2008 Page 3 / 6
XSMALL 04 OPERATING LOGIC
4.3. Coffee cycle operating diagram
Main switch
ON
START STOP
Time
Coffee grinder
Heating
Pump
Brewing unit
gear motor
Status
Heating Ready Coffee cycle
approx.
45 secs.
Pulses
(Dosage)
Pump operation (tur-
bine pulses) in accord-
ance with the amount
of product selected.
*
Notes: * Only with Pre-brewing
MS status
OFF
Single microswitch gear motor
ON
Switching on
When the machine is switched on, the gear motor repositions itself as follows:
- It acts on microswitch 1 (see following section).
- The gear motor changes its rotation direction and moves upwards again by approx. 1-2 mm.
- The boiler begins to heat water for approx. 45 seconds. It absorbs all the available heating
power in order to reach the optimal temperature. The temperature will then remain at a con-
stant level.
Coffee cycle
The coffee grinder starts the grinding process (controlled by pulses generated by a sensor). 1.
The gear motor (brewing unit) moves to the dispensing position. 2.
Preliminary dispensing phase (short pump activity, short pause). 3.
Product dispensing (the pump operation period is de fi ned by the amount of product dis- 4.
pensed).
The gear motor moves to its home position (the dregs are expelled automatically). 5.