Philips 3000 series, Service Manual, Page: 33 / 79

PHILIPS 4000 and 3000 04 OPERATING LOGIC
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Switching on
When the machine is switched on, the gear motor repositions itself as follows:
- It acts on microswitch 1
- 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
optimal temperature. The temperature will then remain at a constant level.
An NTC is used as a temperature sensor; in the event of overheating this reduces boiler element
power consumption.
The electronic system detects the current boiler temperature from the drop in voltage of the
sensor and adjusts it accordingly.
Heating element values and corresponding temperatures : see table.
4.7. Temperature sensor (adjustment)
Temp. (°C) R nom (kΩ) ΔR (+/- %)
20 61.465 8.6
50 17.599 5.9
75 7.214 4.1
80 6.121 3.7
85 5.213 3.4
90 4.459 3.1
100 3.3 2.5
125 1.653 3.9
150 0.893 5.1
4.3. Single microswitch
The gear motor is powered by a direct cur-
rent motor that engages with the smaller
double toothed wheel using a worm screw.
The unit is mounted on the axle of the large
gear wheel and when a coffee is requested, it
moves from the standby position to the dis-
pensing position, and then back to the stand -
by position again.
- Standby position: 1
- Dispensing position: 2
2
1