Common Breakdown And Means Of Repairing - Sharp SMC1452CH Service Manual

COMMON BREAKDOWN AND MEANS OF REPAIRING

PHENOMENON
1.When starting
oven, the lamp is not on,
the turntable tray can't
rotate and the food can't
be heated
2.When starting
oven, the lamp is on, the
turntable rotating, the fan
cycling but the food can't
be heated.
3.The food can
heated, but the lamp is
not on.
4.The food can
heated but the turntable
tray is not rotating.
5.The oven can heat
within 2-3 minutes, but
can not heat from the
fourth minutes.
6.When starting the
oven, it can't heat, and
with "wenwen" noise
7.The oven can heat,but
with sound "shishi" noise
8.Large amount of
microwave leakage
9.The door can't open
10.The door release
button fall off
11.Electricity leaking
1. fuse broken
2. The primary and secondary winding of the
transformer are short-circuited.
the 3. The earthing or the polarity of the capacitor is
punctured.
4. The pilot switch can't cut off.
5. The interlock switch hasn't closed.
6. The power plug and the socket are not in good
connection.
7. The door hook broken.
the 1. The primary and secondary winding, the
filament of the transformer are open-circuited.
2. The magnetron filament is open-circuited, the
magnetic steel of the magnetron broken or the
magnetron is air leaking.
3. Time and power distributor broken..
4. The plugs of the magnetron of the capacitor
loosed.
be 1. The lamp broken.
2. The plug fall off.
be 1. The turntable motor broken
2. The plug fall off
3. Connecting shaft weave broken
1. The winding of the fan motor in open-circuited.
2. The fan falls off
3. The plug of the fan motor falls off
4. The turntable shaft is griped with the motor
bearing.
5. The cooling vent blocked
The high voltage diode was punctured
The iron core of the transformer loosed
1. The door deformed
2. The door metal net cracked
3. The gap of the door crack is too large
4. The welding point of the oven fall off
5. The screws which fix the magnetron loosed
6. The wave guide connection oxidized
7. The magnetron copper filament washer is too
thin cause the wave guide opening not in good
earth.
1. After long time using, the wear and the rust-
eaten enlarged the gap of the door shaft and
the shaft hole, thus cause the door crooked.
2. The door hook broken
Wore aged after long time operating
The earthing insulation resistances of all the
motors or the transformer are less than 2 mega
ohm.
CAUSE
5-9
REPAIRING MEANS
1. Change a new fuse.
2. Change a new
transformer.
3. Change a new capacitor.
4. Change a new pilot
switch.
5. Change a new interlock
switch.
6. Adjust the connection or
replace it by a new one.
7. Change a new book.
1 . Cha nge a new
transformer.
2. Change the magnetron.
3. Change the time power
distributor or the micro-
switch.
4. Fix them.
1. Change a new lamp
2. Insert the plug again
1. Change the turntable
motor
2. Insert the plug securely
3. Change the weave
1. Change the fan motor
2. Change the fan
3. Insert the plug
4. Overhauling them
5. Repairing it
Change a new diode
Change a new transformer
1. Mend the door
2. Change the door
3. Adjust the gap
4. Change the oven
5. Tighten the screws
6. Scrape the oxidized and
tighten the screws
7. Thick the copper filament
washer
1. Adjust the hinge to rectify
the position of the door.
2. Change the hook
Overhaul it or renew it
Test where is the leaking
place, then repair it or
change those damaged
components.