Welbilt Merrychef eikon e1s, Manual

Page: 103 / 148

103
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 M Ω
•
Filament winding and chassis. Pass if reading is over 10 M Ω
Note: One end of the High Voltage winding is connected to the chassis, so this is not tested.