High Voltage Microwave Oven Fuse 0.8A 5 kV
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When your microwave oven stopped to warm up food, first thing what you want to do, go shopping and get the new one.
But, wait a minute, just realised that you bought that one 18 months ago.
You spent a lot of money, warranty on appliance just finished and stopped work.
When your appliance seams working fine, but the food is still cold.
Your appliance is broken.
In 90% of faulty microwave ovens when food is not warmed up as should be happened, burned high voltage fuse is responsible for that (most appliances sold in UK and EU).
Some microwave ovens haven't high voltage fuse.
All work with microwave oven should be carried out by the qualified technician or person who knows how to deals with electrics.
Microwave ovens are among the most dangerous appliances to work on.
Before attempting any troubleshooting, testing or repairs, for your personal safety, we strongly urge you:
-disconnect from mains
- do not do any measurements on high voltage side of the transformer when appliance connected to the mains
-high voltage in the microwave oven is about 4200V
-do not touch any conductive wires on HV side, even by the insulated screwdriver
- do not measure a voltage on the secondary winding
The capacitor can store the electric charge that can be dangerous to health and life.
High voltage capacitor is placed in the plastic tube (black or white), mounted on one of the second wiring connectors.
Second wire of fuse is connected to the high voltage capacitor.
Open the tub, need the flat screwdriver.
Check if fuse need replace.
If the fuse is ok, need to check high voltage capacitor.
The high-voltage capacitor works together with the high voltage diode to double high voltage from 2100V secondary (output) winding of the power transformer to 4200V on the magnetron.
This high voltage gets the magnetron into oscillation.
To discharge capacitor you need to create a short circuit between the two capacitor terminals and from each terminal to chassis.
Ground each magnetron terminal by creating a short circuit to chassis ground using the blade of a screwdriver as explained above.
In some models, the diode is located inside of the high voltage capacitor. In this case, identify the diode terminal and perform the same test as above, measuring from the diode terminal to the capacitor's metal case.