Sharp R-961 (W) - Page 22

TEST PROCEDURES
PROCEDURE
COMPONENT
TEST
LETTER
J FUSE F115A
CARRY OUT 3D CHECKS.
If
the
fuse
F1
15A
is
blown,
there
is
a
shorts
or
grounds
in
electrical
parts
or
wire
harness.
Check
them
and
replace
the
defective
parts
or
repair
the
wire
harness.
CARRY OUT 4R CHECKS.
CAUTION: Only replace fuse with the correct value replacement.
K BLOWN FUSE F2 F8A
CARRY OUT 3D CHECKS.
1.
If
the
fuse
F2
F8A
is
blown
when
the
door
is
opened,
check
the
monitored
latch
switch,
and
monitor
switch.
2.
If
the
fuse
F2
F8A
is
blown
by
incorrect
door
switching
replace
the
defective
switch(es)
and
the
fuse
F2
F8A.
3.
If
the
fuse
F2
F8A
is
blown,
there
could
be
a
short
or
ground
in
electrical
parts
or
wire
harness.
Check
them
and
replace
the
defective
parts
or
repair
the
wire
harness.
CARRY OUT 4R CHECKS.
CAUTION:
Only
replace
fuse
F2
F8A
with
the
correct
value
replacement.
eee
eee
MIEN
L
B
NE
F1
CARRY OUT 3D CHECKS.
1.
If
the
fuse
F3
F10A
is
blown,
there
could
be
a
short
or
ground
in
electrical
parts
or
wire
harness.
Check
them
and
replace
the
defective
parts
or
repair
the
wire
harness.
2.
If
the
fuse
F3
F10A
is
blown,
there
could
be
shorts
in
the
asymmetric
rectifier
or
there
is
a
ground
in
wire
harness.
A
short
in
the
asymmetric
rectifier
may
be
occurred
due
to
short
or
ground
in
H.V.
rectifier,
magnetron,
high
voltage
transformer
or
H.V.
wire.
Check
them
and
replace
the
defective
parts
or
repair
the
wire
harness.
CARRY OUT 4R CHECKS.
CAUTION:
Only
replace
fuse
F3
F10A
with
the
correct
value
replacement.
M
CONVECTION
HEATING
ELEMENT
AND
GRILL
HEATING
ELEMENT
TEST
CARRY OUT 3D CHECKS.
Before
carrying
out
the
following
tests
make
sure
the
heating
element
is
completely
cool.
1.
Resistance
of
heating
element.
Disconnect
the
wire
leads
to
the
heating
element
to
be
tested.
Using
ohmmeter
with
low
resistance
range.
Check
the
resistance
across
the
terminals
of
the
heating
element
as
described
in
the
following
table.
Table:
Resistance
of
heating
element
Parts name
Convection
heating
element
Approximately
39
Q
Grill
heating
element
Approximately
22
Qx2=44Q
2.
Insulation
resistance.
Disconnect
the
wire
leads
to
the
heating
element
to
be
tested.
Check
the
insulation
resistance
between
the
element
terminal
and
cavity
using
a
500V
-
100MQ
insulation
tester.
The
insulation
resistance
should
be
more
than
10MQ
in
the
cold
start.
Ifthe
results
of
above
test
1
and/or
2
are
out
of
above
specifications,
the
heating
elementis
probably
faulty
and
should
be
replaced.
CARRY OUT 4R CHECKS.
nn
ee
ct
=
N THERMOSTA
CARRY OUT 3D CHECKS.
Disconnect
connector
C
from
CPU
unit.
Measure
the
resistance
of
thermistor
with
an
ohmmeter.
Connect
the
ohmmeter
leads
to
Pin
No's
C1
and
C3
of
the
thermistor
harness.
R-961 - 20
Ee ye ee