Merrychef eikon
®
e2s service and repair manual
61
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5 Service information
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Commissioning the oven after service/repair/testing
5.8
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.
See section 2.15 ‘How to discharge the e2s HV’.
§
The casing of the appliance has been removed.
Note: the left hand transformer connects to the right hand HV components
DANGER
High voltages and significant currents are present at the high voltage capacitor and HV Circuit.
It is very dangerous to work near this part when the oven is on.
NEVER make any electrical measurements on the high voltage circuits, including the magnetron filament, whilst the oven is
connected to the mains power supply.
3.
Mains winding between tags,
approx.;
0 to 230; 0.6
Ω
0 to 200; 0.5
Ω
200 to 230; 0.1
Ω
4.
High Voltage winding, approx.
57
Ω
.
5.
Filament winding between
terminals, less than 1
Ω
.
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:
•
200 – 230V Transformer
Complete the following checks after the oven has been
serviced/repaired/tested before connecting to the mains
electricity power supply:
1.
All internal electrical connections are correct (see "Electrical
circuit diagrams" in section 7).
2.
All wiring insulation is correct and is not touching any sharp
edges.
3.
All grounding connections are electrically and mechanically
secure.
4.
Any removed heat tape or cable ties are refitted/replaced.
5.
All door safety interlocks are secure and mechanically sound.
6.
The door activates all of the door interlock switches and in the
correct order.
7.
The door operation is smooth.
8.
The door seal is in good condition and seals against the cavity
9.
The casing is securely refitted with no trapped wires and all of
the fixing bolts are refitted.
Before finishing a service call, recheck the
following points:
1.
Run the recommission tests to ensure the oven
is functioning correctly and the touch screen is
working.
2.
Microwave emissions are below the
permissible limit of 5mW/cm
²
, ideally
<0.5mW/cm
2
.
3.
The power output of the oven is checked in
accordance with the procedure.
4.
Earth leakage is within permissible limits.
5.
The oven has a correct air gap of 50 mm / 2
inches above. Air flow should not be restricted
at the front, top or rear of the oven.
6.
Complete the service report.
