Drip Tray - Bosch TCA640 Series Repair Instruction

4.7

Drip tray

4.7.1 Tray contacts
The tray contacts (A) detect whether
►
the drip tray has been inserted.
►
the drip tray has been filled with water.
If the drip tray has not been inserted, an electric circuit is opened.
TRAYS MISSING is displayed. When the drip tray has been inserted,
a tray contact closes the circuit. The appliance is ready for use again.
When the drip tray is full of water, the tray contacts (A) are inserted
into the water. The electrical resistance between the tray contacts
drops. EMPTY TRAYS is displayed.
If the EMPTY TRAYS display does not go out despite the trays having
been emptied, there may be residual water or moisture between the
contacts (transfer resistance caused by damp ground coffee).
Carefully clean trays in the area of the contacts with a soap solution
and then dry.
Note:
From production date FD8701 on the presence of the
drip tray is monitored by an additional microswitch in the
appliance actuated by a trigger on the drip tray. If the
drip tray is pulled out, the microswitch opens and
interrupts the power supply to the gear motor via the
power module.
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