R-86STM (serv.man7). Troubleshooting Guide — Sharp Home Appliance Service Manual (repair manual)

Model
R-86STM (serv.man7)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
70.58 KB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / Microwave Oven / Troubleshooting Guide
File
r-86stm-sm7.pdf
Date

View Sharp R-86STM (serv.man7) Service Manual online

R86STM
7 – 1
R86STM
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).
R86STM
7 – 2
Fuse
F8A
blows
when
the
door
is
opened.
Home
fuse
blows
when
power
cord
is
plugged
into
wall
outlet.
Fuse
20A
blows
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/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.
(Oven
lamp
lights.)
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
STOP/CLEAR
k
ey
is
touched.
Oven
stops
after
4
minutes
and
15
seconds
since
START
key
is
touched.
(Except
Microwave
mode)
Display
operates
properly
but
all
electrical
parts
d
o
n
ot
operate.
Oven
goes
into
cook
cycle
but
shuts
down
before
end
of
cooking
cycle.
After
cooking,
the
temperature
of
oven
cavity
is
higher
than
105ºC
but
fan
motor
does
not
operate.
Oven
seems
to
be
operating
but
little
or
no
heat
is
produced
in
oven
load.
(Microwave
power
control
is
set
at
HIGH)
Oven
does
not
seem
to
be
operating
properly
during
variable
c
ooking
condition
except
HIGH
cooking
condition.
Oven
goes
into
cook
cycle
but
shuts
down
before
end
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
heating
element
does
operate.
Oven
goes
into
cook
cycle
but
shuts
down
before
end
of
cooking
cycle.
Oven
seems
to
be
operating
but
little
or
no
heat
is
produced
in
oven
load.
(Microwave
power
does
not
seem
to
be
generated
properly)
Oven
seems
to
be
operating
but
the
temperature
in
the
oven
cavity
is
lower
or
higher
than
preset
one.
Top
and
Bottom
Grill
heating
elements
do
not
heat.
Top
or
Bottom
Grill
heating
element
does
not
heat.
OFF
CONDITION
COOKING
CONDITION
(COMMON
MODE)
MICROWAVE
COOKING
CONDITION
GRILL
COOKING
CONDITION
CONVECTION
COOKING
CONDITION
COMBI
COOKING
CONDITION
(COMMON
MODE)
COMBI
COOKING
CONDITION
(MICRO./CONV.)
COMBI
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
POWER SUPPLY CORD
FOIL PATTERN ON P.W.B.
RELAY RY7
RELAY RY6
RELAY RY5
RELAY RY4
RELAY RY3
RELAY RY2
RELAY RY1
KEY UNIT
TOUCH CONTROL PANEL
TC TRANSFORMER
BTTOM GRILL HEATING ELEMENT
TOP GRILL HEATING ELEMENT
NOISE FILTER (FUSE F8A)
FUSE 20A
NOISE FILTER
CONVECTION FAN MOTOR
FAN MOTOR
TURNTABLE MOTOR
THERMAL CUT-OUT 145ºC (OVEN)
THERMAL CUT-OUT 125ºC (MG)
THERMISTOR
MONITOR SWITCH
STOP SWITCH
MONITORED LATCH SWITCH
HIGH VOLTAGE CAPACITOR
H.V. HARNESS
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE TRANSFORMER
MAGNETRON
A
B
C
D
EEE
F
G
G
H
H
H
TEST
PROCEDURE
POSSIBLE
CAUSE
AND
DEFECTIVE
PARTS
I
J
K
L
L
M
N
OOOOO
OO
P
Q
OVEN LAMP
Page of 2
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Here you can view online or download Sharp R-86STM (serv.man7) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp R-86STM (serv.man7) Microwave Oven. Information contained in Sharp R-86STM (serv.man7) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).