Philips HD 8930, Service Manual

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NEW ROYAL 04 OPERATING LOGIC
Saeco International Group Rev. 00 / July 2011 Page / 07
Notes: * Only with Pre-brewing
Single microswitch gear motor
4.5. Coffee cycle
Switching on
When the machine is switched on, the gear motor repositions itself as follows:
- It acts on microswitch 1 (see following chapter)
- The gear motor changes its rotation direction and moves upwards again by approx. 1-2 mm
- The boiler begins to heat the water for approx. 45 sec., at full power, in order to reach the opti-
mal temperature. The temperature will then remain at a constant level.
Coffee cycle
1. The coffee grinder starts grinding (managed by the doser microswitch)
2. The doser opens
3. The gear motor (brewing unit) moves to the brewing position
4. Preliminary dispensing phase (short pump activity, short pause)
5. Product dispensing (the pump operation period is defined by the amount of product dispensed)
6. The gear motor moves to its home position (the dregs are expelled automatically)
Main switch ON START STOP
Time
Coffee grinder
Heating
Pump
Brewing unit gear
motor
Status Heating Ready Coffee cycle
Pulses
(Dosage)
Pump activity
(flow meter pulses)
depending on the
product quantity
selected
approx.
45 sec.
*
04
Status
Microswitch
OFF
ON