49
Maintenance
Checking reed contact
During the test the coffee
machine must be switched off
and unplugged from the mains!
Procedure:
1 Follow general disassembly stage 1 (see
page 24, only remove the side piece
covering the electronic mainboard).
2 Remove connector of reed contact from
electronic mainboard.
3 Switch on digital multimeter and set rotary
switch to continuity check.
4 Insert probe tips at the rear side of the
connector and touch contacts of brown
and orange wires.
5 Turn hot water/steam lever to the back:
An acoustic signal is audible, otherwise
the reed contact is faulty.
6 Insert probe tips at the rear side of the
connector and touch contacts of brown
and yellow wires.
7 Turn steam/hot water lever to the front:
An acoustic signal is audible, otherwise
the reed contact is faulty.
2
3
4
5
Checking detection of jaw position
During the test the coffee
machine must be switched off
and unplugged from the mains!
Procedure:
1 Follow points 1 to 3 from checking reed
contact procedure.
2 Insert probe tips at the rear side of the
connector and touch contacts of brown
and red wires.
3 Open jaw slowly till an acoustic signal is
audible. Then close jaw slowly till signal
stops.
Refer to page 48 for maximal
opening and closing distances.
4 Repeat test if necessary.
The reed contact is faulty if
- no signal is audibel during jaw movement,
- the signal sounds after the maximum
distance of 35 mm while opening the jaw,
- the signal ceases before the maximal
distance of 18 mm while closing the jaw.
Summary of Contents for EF 737
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