Samsung WA7750M, Service Manual

Page: 29 / 40

Troubleshooting _ 27
Symptom
Check Code
Countermeasure
Troubleshooting Procedure
Measurement Picture
Door
Check
►
DC
This
may
occur
when
the
door
switch
is
defective.
This
may
occur
when
the
main
PCB
is
defective.
•
Check
if
a
dE
Check
occurs
durin
g
the
boiling
course.
•
As
this
Check
occurs
because
the
door
is
opened,
close
the
door
.
•
Since
120V
pow
er
is
connected,
check
if
the
power
cord
is
disconnected
or
check
the
insulation
status
and
repair
it
if
necessary
.
•
If
the
m
ain
PBA
door
detection
cir
cuit
is
defective,
replace
it.
•
Verify
door
is
properly
closed
and
no
laundry
caught
in
the
door
1.
Check
the
resistance
for
Reed
SW
(Checking
Part
:White-Green
Wire)
-
Resistance:
Approx
0.2Ω
between
the
terminals
of
Reed
SW
.
2.
Check
the
resistance
for
Motor
(Checking
Part
:
Black-Brown
Wire)
-
Resistance:
33Ω
to
46Ω
between
the
terminals
of
Motor
.
►
DC1
DC2
The
door
lock
switch
unit
is
not
inserted.
The
door
lock
switch
unit
is
damaged. The
wire
is
disconnected.
The
door
lock
switch
unit
is
defective. This
may
occur
due
to
a
defect
of
the
main
PCB.
•
Check
whether
the
door
lock
switch
unit
is
inserted.
•
Check
whether
the
door
lock
switch
unit
is
damaged.
•
Check
the
disconnection
of
the
wire.
•
If
the
door
lock
switch
unit
is
defe
ctive,
replace
it.
•
If
the
m
ain
PCB
is
defective,
repla
ce
it.
3.
Check
the
resistance
for
Lock/
Unlock
Contact
(Checking
Part
:
Lock
White-Red
Wire
Unlock
White-Blue
Wire)
-
Resistance:
Resistance:
Approx
0.2Ω
between
the
terminals
of
Contact.
Check
the
Door
Lock/Unlock
state.
Switch
Check
(Main
Relay
Check)
►
BC2
The
Power
button
is
continually
pressed.
A
button
other
than
the
Power
button
is
continually
pressed.
• Check
whether
either
the
Power
switch
or
a
tact
switch
is
continually
pressed.
• Check
whether
the
service
PBA
holding
screws
are
fastened
too
tight.
If
they
are
fastened
too
tight,
loosen
them
a
little.
• If
the
main
PBA
switching
IC
on/off
Check
has
occurred,
replace
the
main
PBA.
• The
“E2”
Check
occurs
if
the
main
relay
connections
are
incorrect.
Check
the
connections.
If
there
is
no
Check
in
the
connections,
replace
the
main
PBA.
Check
the
contact
between
the
control
panel
buttons
and
their
corresponding
tact
switch.
-
There
must
be
a
gap
between
a
control
panel
button
and
its
corresponding
micro
switch.
Otherwise,
an
Check
occurs
after
approx.
30
seconds
has
passed.