SOURCE: Looking for arepair manual for LG MS 428MD micro
I don't recall ever needing a repair manual to repair a microwave oven apart from part numbers to order spare parts from. Door switches If one of the door interlock switches
is not switching properly or there is a condensation problem on the
sensor control panel, either can cause the turntable/light/oven to
come on even though the "Start" button has not been
depressed due to the wiring of the switches. Error F3 control board faulty. It sounds like the magnetron may have
either failed or is not being supplied with the extremely high
voltage required to run it. YOUR
SAFETY IS PARAMOUNT This is a job for a professional but if
you are safety clued up, here's instruction. Load
test. A
simple safety test. Magnetron used with no load. It sounds like the magnetron may have
either failed or is not being supplied with the extremely high
voltage required to run it. Using the microwave with nowhere for the
energy to go results in magnetron meltdown! The magnetron may be all that is
required but the diode pack may also have failed. These components
are Safety Critical Items and MUST be replaced with
identical units for continued safety. Spare parts are available through the
Manufacturers Authorized Agent. Go online to find a supplier near
you. Hope that helps.
Replacement of the
lamp should be carried out by a qualified appliance repair service. YOUR
SAFETY IS PARAMOUNT! Attempt
this only if you are competent. But here is a basic method if you are
mechanically minded and have electrical safety knowledge. The lamp is sat in a housing and its
position is adjacent to the vent holes that it shines through. Replacement of the
turntable motor should be carried out by a qualified appliance repair
service. YOUR
SAFETY IS PARAMOUNT! Attempt
this only if you are competent. But here is a basic method if you are
mechanically minded and have electrical safety knowledge. I am assuming the plastic coupler is
not split or broken and causing the problem. The motor assembly is fixed to the base
of the oven usually with two screws and access is obtained usually by
removing the inspection plate directly beneath the motor. It is
usually a plug in synchronous motor that revolves at a few revs per
minute but the plastic cogs in the motors gear box fail and the motor
assembly must be replaced. They are fairly inexpensive and obtainable
usually from a domestic appliance repair shop. Replacing the display unit. Disconnect from any power source.
Remove the outer case. Press to open the door and just beneath the
open button there is a self tapping screw holding the front unit down
and in the slots. Remove the screw. Remove the plugs making a note of
where they all came from! (A mobile phone camera is very handy for
this job).
Is it dead?
Check for faulty door
switches and/or contaminated actuators.
I hope that helps.
Make sure the !!!!any
capacitors are discharged!!!!! before attempting any sort of
repair.
Check the door interlock switches first then the high
voltage diode with either an AVO model 8 or moving coil meter on high
resistance range for short circuit, (DVM's won't show the fault!),
the capacitor can fail and go short circuit, the feed fuse on the
primary of the high voltage transformer and then finally, the
magnetron is best checked by substitution.
Hope that helps.
Place 1/2 litre of water in a glass container.
Measure the temperature of the water.
Place in microwave and heat
on full power for 1minute.
Measure the temperature after it has
stood for 1minute.
If the temperature difference is more than 9
degrees Celcuis the magnetron is working and producing about 700Watts
of heat.
If your microwave is labelled with 900 or 1000Watts. That
is about right.
If the temperature is less then the magnetron is
not working properly and may need replacing.
This
a only a rough guide and any doubts you should consult an authorised
service agent.
Make sure the
!!!!capacitors are discharged!!!!! before attempting
any sort of repair.
If
you feel confident, disconnect it from the mains power, remove
anything in the cavity.
Remove the microwave cover. Purchasing a
new replacement lamp will be useful as it will give you an idea of
what it looks like. Locate the dead lamp remove the lamp and fit the
new one. Replace the covers. Plug it back in and try the lamp by
opening the door.
Hope this helps.
If you feel
confident, disconnect it from the mains power, remove anything in the
cavity and turn it upside down if it is a tabletop model, a little
more complicated if it is built in!
Remove the inspection plate,
sometimes it must be cut out with sharp cutters, and disconnect the
motor. Remove the motor and go and get a new one. Fit the new motor
and fit the inspection cover back on the base by turning it to fit
and using an extra screw fix it then put the microwave back in its
position. Plug it back in, with the turntable and plate. Put a cup of
water on the plate inside of the oven and heat for 20 seconds to
check the plate goes round.
Hope this helps.
SOURCE: lg microwave ms-428md does not heat up food
8 or 10 or 12 amp fuse inside is worth checking but it is not a normal fuse Re: Jeff
SOURCE: Owner Manual LG Microwave Model MS 2342DP
try with this www.fitnessmanualsonline.com or www.manualslib.com
God bless you
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