FUNCTION OF IMPORTANT COMPONENTS
DOOR OPEN MECHANISM
1.The door release lever is pulled.
2.The upper latch head is lifted up by the linked door release lever.
3.The head lever is lifted up by the door release lever.
4.The joint lever is lifted up by the head lever.
5.The lower latch head is lifted up by the joint lever.
6.Now both latch heads are lifted up, so they can be released from the latch hook.
7.Now the door can be opened.
3.If the door is opened and the interlock switch SW1 (or SW2) contacts fail to open, the fuse F1 F10A (or F2 F10A) blows simultaneously with closing of the monitor switch SW3 (or SW4) contacts.
CAUTION:BEFORE REPLACING A BLOWN FUSE F1 F10A (OR F2 F10A) TEST THE INTERLOCK SWITCH SW1 (OR SW2) AND MONITOR SWITCHE SW3 (OR SW4) FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).
Door release lever
Joint lever
Head lever
Latch head
Latch hook
SW4: Monitor switch (Oven side)
SW3: Monitor switch
SW2: Interlock switch (Oven side)
SW1: Interlock switch
SW5: Stop switch
NOISE FILTER
The noise filter assembly prevents radio frequency inter- ference that might flow back in the power circuit.
FUSES F1, F2 F10A 250V
1.If the wire harness or electrical components are short- circuited, this fuse blows to prevent an electric shock or fire hazard.
2.The fuse F1 F10A (or F2 F10A) also blows when interlock switch SW1 (or SW2) remains closed with the oven door open and when the monitor switches SW3 (or SW4) closes.
WEAK POINT F3
If the wire harness or electrical components make a short- circuit, this weak point F3 blows to prevent an electric shock or fire hazard.
Latch head
Figure D-1. Door Open Mechanism
INTERLOCK SWITCHES SW1, SW2 AND STOP SWITCH SW5
1.When the oven door is closed, the contacts
2.When the oven door is opened, the contacts
MONITOR SWITCHES SW3, SW4
The monitor switches SW3, SW4 are activated (the con- tacts opened) the upper latch head and switch lever A while the door is closed. The switch SW3 (or SW4) is intended to render the oven inoperative by means of blowing the fuse F1 F10A (or F2 F10A) when the contacts of the interlock switch SW1 (or SW2) fail to open when the door is opened.
Function
1.When the door is opened, the monitor switches SW3 +SW4 contacts close (to the ON condition) due to their being normally closed. At this time the interlock switch SW1+SW2 are in the OFF condition (contacts open) due to their being normally open contact switches.
2.As the door goes to a closed position, the monitor switches SW3+SW4 contacts are opened and inter- lock switch SW1+SW2 contacts are closed (On open- ing the door, each of these switches operate inversely.)
HIGH VOLTAGE FUSE(S) F4, F5
The high voltage fuse blows when the high voltage rectifier or the magnetron is shorted.
MAGNETRON TEMPERATURE FUSES TF1, TF2
The temperature fuses TF1, TF2 located on the top of the upper and lower waveguide, are designed to prevent damage to the magnetrons MG1, MG2. If an over heated condition develops in the tube due to blower motor failure, obstructed air ducts, dirty or blocked air intake, etc., the circuit to the magnetrons are interrupted. Under normal operation, the temperature fuses remains closed. How- ever, when abnormally high temperatures are generated within the magnetrons, the temperature fuses will open at 150˚C causing the microwave energy to stop. The defec- tive temperature fuses must be replaced with new rated ones.
EXHAUST TEMPERATURE FUSE TF3
The temperature fuse TF3, located on the side of the exhaust duct assembly, is designed to prevent damage to the oven by fire. If the food load is overcooked, by either error in cook time or defect in the control unit, the tempera- ture fuse will open. Under normal operation, the oven temperature fuse remains closed. However, when abnor- mally high temperatures are generated within the oven cavity, the oven temperature fuse will open at 120˚C, causing the oven to shut down. The defective temperature fuse must be replaced with new rated one.
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