E52: No Signal From Motor Tachometric Generator (First Part) - Electrolux EWM09312 Service Manual

E52: No signal from motor tachometric generator (first part)

E52
Cycle interrupted after 5 attempts during the cycle, immediately if recognised at the start of
Checks to perform:
Access phase 7
of the diagnostic cycle
(The drum rotates at
55 rpm clockwise
55 rpm anticlockwise
with pulse at
250 rpm). Is the motor
running correctly?
YES
The motor protector
probably tripped.
Before replacing
the motor, check:
► whether the water
circuit of the pressure
switch is ok (small
leaks from the tube
could cause the water
fills to more than
normal and the motor
could overheat).
► whether the
bearings are ok and
the drum rotates
without friction.
►that the supply
voltage is correct
(with low voltage,
which does not
however exceed the
threshold of alarm
EH3, the motor might
not start).
Repeat the diagnostic
cycle to check for any
further alarms.
2012 SOE/DT-mdm FCPD-dp
Guide to diagnostics of EWM09312 electronic controls
the cycle or during diagnostics.
Does the motor
run for a few
moments then
NO
stop?
Y
E
S
Measure between
the terminals of the
wiring connector
J11-6 and J11-7.
Are the values (Ω) of
the tachometric
generator correct?
(as on page 47
Point 4 – phase "A")
Y
E
S
Measure between the
same terminals of the
wiring connector
(J11-6 and J11-7)
and the appliance
body.
Is there any
dispersion?
(see fig.6)
YES
Detach the connector
from the motor and
measure between the
terminals and the
motor casing.
(see fig. 10)
Is there any
dispersion?
YES
Replace the motor and repeat the diagnostic cycle to check for any further alarms.
!
Check that all the connectors are correctly inserted
The motor never runs
NO
- see page 46 -
Detach the
connector from the
motor and measure
(Ω) the tachometric
generator coil,
NO
(see fig. 11)
Is the value
correct?
(as on page 47
Point 4 - phase "A").
YES
Check/replace the wiring and repeat the
diagnostic cycle to check for any further alarms.
Check the
positioning of the
tachometric
NO
generator.
Is it correct?
(see fig. 12)
YES
Replace the main circuit board and repeat the
diagnostic cycle to check for any further alarms.
Check/replace the wiring and repeat the
diagnostic cycle to check for any further alarms.
NO
!
44/69
Replace the
motor or
tachometric
generator and
repeat the
NO
diagnostic cycle
to check for any
further alarms.
Replace the
motor/generator
and repeat the
NO
diagnostic cycle
to check for any
further alarms.
If there are burns on the circuit board,
see page 67
599 75 18-74 Rev.00
E52