Sharp R-939(BK), Service Manual

Page: 17 / 52

R939(W)
7 – 2
[2] CHART
Fuse
F2
(F8A)
blows
when
the
door
is
opened.
Home
fuse
blows
when
power
cord
is
plugged
into
wall
outlet.
Fuse
F1
20A
b
lows
when
power
cord
is
plugged
into
wall
outlet.
Nothing
appears
in
display
when
power
cord
is
plugged
into
wall
outlet
and
the
door
is
opened
and
closed.
Display
does
not
operate
properly
when
STOP
button
is
pressed.
Oven
lamp
does
not
light
when
door
is
opened.
(Display
operates.)
Oven
does
not
start
when
the
START
button
is
pressed.
(Display
operates.)
Oven
lamp
does
not
light
and
turntable
motor
does
not
operate.
Fan
motor
does
not
operate.
(Oven
lamp
lights.)
Convection
fan
motor
does
not
operate.
(Fan
motor
operates.)
Turntable
motor
does
not
operate.
(Oven
lamp
lights.)
Oven
or
any
electrical
parts
(except
fan
motor)
does
not
stop
when
cooking
time
is
0
o
r
S
TOP
button
is
pressed.
Oven
stops
after
4
minutes
and
15
seconds
since
START
button
is
pressed.
(Except
Microwave
mode
and
D
ual
cook
mode)
Display
operates
properly
but
all
e
lectrical
parts
do
not
operate.
Oven
goes
into
c
ook
cycle
b
ut
shuts
down
before
end
o
f
cooking
cycle.
After
cooking,
the
temperature
of
oven
cavity
is
higher
than
120ºC
but
fan
motor
does
not
operate.
The
oven
stops
1
minute
a
fter
starting.
Oven
seems
to
be
operating
but
little
or
no
heat
is
produced
in
oven
load.
(Microwave
power
control
is
set
at
100%)
Oven
does
not
seem
to
be
operating
properly
during
variable
cooking
condition
except
100%
cooking
condition.
Oven
goes
into
c
ook
cycle
b
ut
shuts
down
before
end
o
f
cooking
cycle.
Convection
cooking
mode
does
not
heat.
Oven
seems
to
be
operating
but
the
temperature
in
the
oven
cavity
is
lower
or
higher
than
preset
one.
Grill
h
eating
element
does
not
operate.
Oven
goes
into
c
ook
cycle
b
ut
shuts
down
before
end
o
f
cooking
cycle.
Oven
seems
to
be
operating
but
little
or
no
heat
is
produced
in
oven
load.
(Microwave
power
does
not
seem
to
b
e
generated
properly)
Oven
seems
to
be
operating
but
the
temperature
in
the
oven
cavity
is
lower
or
higher
than
preset
one.
Convection
heating
elements
d
o
not
heat.
Grill
h
eating
element
does
not
heat.
OFF
CONDITION
COOKING
CONDITION
(COMMON
MODE)
MICROWAVE
COOKING
CONDITION
GRILL
COOKING
CONDITION
CONVECTION
COOKING
CONDITION
DUAL
COOKING
CONDITION
(COMMON
MODE)
DUAL
COOKING
CONDITION
(MICRO./CONV.)
DUAL
COOKING
CONDITION
(MICRO./GRILL)
CONDITION
PROBLEM
BLOCKED COOLING FAN
BLOCKED CONVECTION FAN
NO POWER AT WALL OUTLET
HOME FUSE OR BREAKER
MIS-ADJUSTMENT OF SWITCHES
BLOCKED VENTILATION OPENINGS
OPENED WIRE HARNESS
SHORTED WIRE HARNESS
OVEN LAMP OR SOCKET
POWER SUPPLY CORD
FOIL PATTERN ON P.W.B.
RELAY RY8
RELAY RY7
RELAY RY6
RELAY RY5
RELAY RY4
RELAY RY3
RELAY RY2
RELAY RY1
KEY UNIT
TOUCH CONTROL PANEL
TC TRANSFORMER
CONVECTION HEATING ELEMENT
GRILL HEATING ELEMENT
NOISE FILTER (FUSE F2 F8A)
FUSE F1 20A
NOISE FILTER
DAMPER MOTOR DM
CONVECTION FAN MOTOR
FAN MOTOR FM
TURNTABLE MOTOR TM
THERMAL CUT-OUT 170ºC TC3
THERMAL CUT-OUT 170ºC TC2
THERMAL CUT-OUT 125ºC TC1
THERMISTOR
DAMPER SWITCH SW4
MONITOR SWITCH SW3
STOP SWITCH SW2
MONITORED LATCH SWITCH SW1
HIGH VOLTAGE CAPACITOR
H.V. HARNESS
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE TRANSFORMER
MAGNETRON
TEST
PROCEDURE
POSSIBLE
CAUSE
AND
DEFECTIVE
PARTS
I
J
K
L
L
M
N
O
OOOO
OOO
P