Service manual

Page 19 Mealstream Ovens 32Z3387 Issue 2
1. Primary Interlock [ 11 , Bottom left-hand ]
The Primary switch will cut off the microwave emissions from the oven when
the door is opened by breaking the mains supply circuit to the transformers.
2. Monitor [ 14 ,Top left-hand Side ] and
Secondary Interlock [ 17 , Bottom right-hand ] Switches.
Operate simultaneously.
The Monitor switch will produce a short circuit across the mains supply if the
Primary interlock switch is faulty, thus blowing the microwave fuse and
rendering the oven inoperative.
The Secondary interlock switch will cut off the microwave emission if the
other switches have failed.
Note:
If operation of the Monitor switch has caused the Microwave Fuse to blow,
the Primary and Monitor microswitches must be changed, as they may have
been damaged by the high short-circuit currents involved.
Door Interlock Operation
Door Interlock Arrangement
Power In
Power Out
L
N
14 Monitor switch
11
Primary switch
17 Secondary switch
The door on the Mealstream oven is monitored by three microswitches. These are used in the
conventional “Primary, Secondary and Monitor” switch arrangement shown below.
The switches operate as follows: