Welbilt Merrychef eikon e1s - High Voltage Transformer Test

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eikon e1s
Service and repair guide
High voltage components (casing removed)
High Voltage Transformer test
Ensure the following requirements have been met before starting the test:
• The appliance has been disconnected from the power supply and protective measures have been taken to ensure
the power cannot be switched on again.
• The appliance is cool.
• The high voltage capacitors are discharged before commencing work.
• Anti-static precautions have been taken.
• The casing of the appliance has been removed.
• High voltages and large currents are present at the high voltage capacitor.
• It is very dangerous to work near this part when the oven is on.
• NEVER make any voltage measurements at the high voltage circuits, including the magnetron filament.
1.
Remove all connections from the transformer.
2.
Using a Digital Multi-Meter (DMM), check the resistance of the windings.
Results should be as follows:
• Mains winding between tags, approx. 0.6 – 1 Ω.
• High Voltage winding, approx. 60 Ω.
• Filament winding between terminals, less than 1 Ω.
It is possible to makes this test across the orange cables of the
magnetron.
3.
Using the DMM, test the insulation resistance between:
• Primary winding and chassis. Pass if reading is over 10 MΩ
• Filament winding and chassis. Pass if reading is over 10 MΩ
Note: One end of the High Voltage winding is connected to the chassis, so this is not tested.