R-98STMA (serv.man7). Troubleshooting Guide - Sharp Home Appliance Service Manual (repair manual)

r-98stma (serv.man7) service manual
Model
R-98STMA (serv.man7)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
59.78 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Troubleshooting Guide
File
r-98stma-sm7.pdf
Date

Read Sharp R-98STMA (serv.man7) Service Manual online

R98STMAA
7 – 1
R98STMAA
Service Manual
 
CHAPTER 7. 
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks.
Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the
“Test Procedure” section.
IMPORTANT:
If the oven becomes inoperative because of a blown fuse F8A in the monitored latch switch - monitor switch circuit, check the monitored latch switch
and monitor switch before replacing the noise filter (fuse F8A).
R98STMAA
7 – 2
Fuse
F8A
b
lows
when
the
door
is
opened.
Home
fuse
blows
when
power
cord
is
plugged
into
wall
outlet.
Fuse
20A
blows
w
hen
power
cord
is
plugged
into
w
all
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/CLEAR
key
is
touched.
Oven
lamp
does
not
light
when
door
is
opened.
(Display
operates.)
Oven
does
not
start
when
the
START
key
is
touched.
(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/CLEAR
key
is
touched.
Oven
stops
after
4
minutes
and
15
seconds
since
START
key
is
touched.
(Except
Microwave
mode
and
Dual
cook
mode)
Display
operates
properly
but
all
e
lectrical
p
arts
do
not
operate.
Oven
goes
into
c
ook
c
ycle
b
ut
shuts
down
b
efore
e
nd
of
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
c
ycle
b
ut
shuts
down
b
efore
e
nd
of
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
c
ycle
b
ut
shuts
down
b
efore
e
nd
of
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
COMBI.
COOKING
COMBI.
COOKING
COMBI.
COOKING
CONDITION
(COMMON
MODE)
CONDITION
(MICRO./CONV.)
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.
P
O
O
O
O
O
O
O
O
N
M
L
L
K
J
I
H
H
H
H
G
G
G
F
E
E
E
E
D
C
B
A
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 F8A)
FUSE 20A
NOISE FILTER
DAMPER MOTOR
CONVECTION FAN MOTOR
FAN MOTOR
TURNTABLE MOTOR
THERMAL CUT-OUT 170ºC (CONV.)
THERMAL CUT-OUT 170ºC (GRILL)
THERMAL CUT-OUT 125ºC
THERMISTOR
DAMPER SWITCH
MONITOR SWITCH
STOP SWITCH
MONITORED LATCH SWITCH
HIGH VOLTAGE CAPACITOR
H.V. HARNESS
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE TRANSFORMER
MAGNETRON
TEST
PROCEDURE
POSSIBLE
CAUSE
AND
DEFECTIVE
PARTS
Page of 2

Download Sharp R-98STMA (serv.man7) Service Manual (Repair Manual)

Here you can read online and download Sharp R-98STMA (serv.man7) Service Manual in PDF. R-98STMA (serv.man7) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp R-98STMA (serv.man7) Microwave Oven. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.