Operation
2-7
DOOR OPEN MECHANISM
The door is opened by pulling the door handle down and
forward, referring to Figure 2-6. When the door handle is
pulled down, the latch heads are moved upward. When
the door handle is pulled forward, the latch heads are
released from the latch hooks right and left. Now, the
door will open.
Figure 2-6.
Component Descriptions
Monitor Switch
Latch Hook Left
Door Handle
Latch
Head
Secondary
Interlock Switch
Door
Sensing
Latch Hook Right
Latch
Head
Switch
MONITOR SWITCH
The monitor switch is mounted on the upper position of
latch hook left. It is activated (the contacts opened) by
the left latch head while the door is closed. The switch
is intended to render the oven inoperative by means of
blowing the monitor fuse when the contacts of the
primary interlock relay and secondary interlock switch fail
to open when the door is opened.
Functions:
1. When the door is opened, the monitor switch contact
closes (to the ON condition) due to their being
normally closed. At this time, the door sensing and
secondary interlock switches are in the OFF condi-
tion (contacts open) due to their being normally open
contact switches.
2. As the door goes to a closed position, the monitor
switch contacts are first opened and then the door
sensing switch and the secondary interlock switch
contacts close. (On opening the door, each of these
switches operate inversely.)
3. If the door is opened, and the primary interlock relay
and secondary interlock switch contacts fail to open,
the monitor fuse blows simultaneously with closing of
the monitor switch contacts.
Before replacing a blown monitor fuse test the door
sensing switch, primary interlock relay, secondary inter-
lock switch and monitor switch for proper operation.
Monitor fuse and switch are replaced as an assembly.
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The door sensing switch in the primary interlock system
is mounted in the lower position on the latch hook right,
the secondary interlock switch is mounted in the lower
position on the latch hook left. They are activated by the
latch heads on the door. When the door is opened, the
switches interrupt the circuit to all components except
for the oven lamp. A cook cycle cannot take place until
the door is firmly closed thereby activating both interlock
switches. The primary interlock system consists of the
door sensing switch and primary interlock relay located
on the control circuit board.
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