Douwe Egberts Cafitesse 100, Service Manual

Page: 110 / 210

07.2004
5A - 28
Functions - Water System Service Manual Cafitesse 100
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Fig. 1
A.4.2 Circuit - Water Coil
• For the operation of the water coil, the
rectified secondary voltage of a transformer
is used.
When a delivery button is actuated, the
water coil is connected to the
microprocessor via a transistor.
The duration depends on the adjusted
volume.
• The microprocessor monitors the circuit by
registering whether there is a voltage
applied at 'A'.
• Standard/no delivery:
When no delivery button is actuated and
there is no voltage registered at 'A' by the
microprocessor for an interval of 5 sec., the
positive voltage is switched off and the
'empty' LED starts flashing.
• Standard/delivery:
When no delivery button is actuated, there
must be no voltage applied at 'A'.
If there is, however, a voltage applied at 'A'
in the case of an error, there will be no
error indication.
The error can only be noticed by the fact
that only concentrate will be delivered in
this case.
F05
main
switch
V4070
mains T02
delivery
button
'empty' LED
MP
transistor
transistor
'A'
water coil
25 V~