Procedure For Door Interlock Adjustment And Test - Garland Mealstream CTM3 Service Manual

PROCEDURE FOR DOOR INTERLOCK ADJUSTMENT AND TEST (1)

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:
Door Interlock Arrangement
L
1
Primary switch
Power In
L
2
1. Monitor switch ( 14 ,Top left-hand Side ). The Monitor switch will produce a
short circuit across the mains supply if the Primary interlock switch is faulty,
when the door is opened, thus blowing the microwave fuse and rendering the
oven inoperative.
2. Primary Interlock ( 11 , Bottom left-hand ) and Secondary Interlock ( 17 ,
Bottom right-hand ) Switches. Operate simultaneously.
The Primary switch will cut off the microwave emissions from the oven when
the door is opened by breaking the electrical supply circuit to the
transformers. The Secondary interlock switch will cut off the microwave
emission if the Primary switch 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.
Switches shown in Door Closed position
11
Monitor switch
Mealstream Ovens Pt. No. 32Z3403 Issue 16
Page 27
Secondary switch 17
Power Out
14