Service manual

Page 3 MC Series Ovens 32Z3329 Issue 4
This manual is designed to assist engineers who have been on a recognised product familiarisation
and training course run by Merrychef Limited. It has been prepared to offer technical guidance for the
Merrychef MC Series Commercial Microwave Ovens.
Please remember that it is wiser not to attempt a service task if you are unsure of being able to
complete it competently, quickly, and above all safely.
To avoid injury to yourself, and to protect the appliance from possible damage, please follow this
Safety Code when servicing these ovens.
Before attempting to repair the oven, check it for microwave leakage.
Check that the oven is not emitting microwaves, even when supposedly not in operation.
Check that the oven is not operating continuously, whether the display indicates cooking or
not.
Always discharge the HT capacitors before working on the oven using a suitably insulated 10
MΩ Resistor
Before removing the rear cover from the oven, do all of the following:
• Switch off the mains supply and remove the plug from the wall socket.
or
• If the oven is hard wired, ensure that the power is turned off at the isolator switch.
Note: the oven does NOT have an On/Off switch.
Upon completion of a service on an MC Series oven, or before reconnecting the appliance to the
mains supply for testing, check all of the following points:
• All internal electrical connections are correct.
• All wiring insulation is correct and is not touching a sharp edge.
• All Earth connections are electrically and mechanically secure.
• All four door safety interlocks are secure and mechanically sound.
• The door operation is smooth.
• The door activates all four of the door interlock switches in the correct order.
• All fuse-holder safety covers are correctly fitted.
Before finishing the service call, recheck the following points:
• All of the electronics are functioning correctly, and all of the touch pads are working.
• The power output of the oven is correct (see pages 7 & 8 ).
• Microwave emission is below permissible limit - 5 mW/cm² (see BS EN 60335-2-90:1998).
• Oven has correct 50 mm air gap all round. Air flow should not be restricted.
SAFETY CODE