LG MC3283FMPG Service Manual page 30

6
Primary Switch is located on the top of
Measure the resistance across the switch ends with a multimeter
No
Normal
Yes
Check connections of the magnetron and measure the resistance across MGT
B/W Filament Terminals
Normal: Less than 1 Ohm
No
Normal
Yes
Check the connection of the high voltage transformer, and measure the
resistance with a multimeter
B/W Primary & Core
Normal= Infinity
No
Normal
Yes
measure the resistance across both ends of high voltage fuse with a multimeter
Normal: around 1 Ohm
Yes
7
latch board
Abnormal
Normal
B/W Filament & Case
Normal: Infinity
B/W Filament & Core
Normal= Infinity
Normal: Around infinity
-26-
Replace Primary
safety Switch
Replace
Magnetron
Replace the
high-voltage transformer