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R-9380
DESCRIPTION
AND
FUNCTION
OF COMPONENTS
MAGNETRON
TEMP.
FUSE
The
temp.
fuse
located
on
the
cavity
top
plate
near
the
magnetron
to prevent
damage
to the
magnetron
if an over
heated
condition
develops
in the
tube
due to cooling
fan
failure,
obstructed
air ducts,
dirty
or blocked
air intake,
ect.
Under
normal
operation,
the temp.
fuse remains closed.
However,
when
abormally
high
temperatures
are
reached
within
the
magnetron
the
fuse will
open
at 115°C
causing
the
oven to shut down.
This is a fuse and it dose not reset.
OVEN
THERMAL
CUT-OUT
The oven thermal
cut-out
is located
on the rear side of.steam
duct.
If is designed
to prevent
damege to the oven cavity
is foods
in the oven catch
fire
due to overheating
produced
by
improper
setting
of cooking
time
etc.
Under
normal
operation,
this
thermal
cut-out
remain
closed.
However,
when
abnormally
high
temperatures
are reached
within
the
steam
duct
thermal
cut-out
will
open
causing
the
oven to
shut down.
DOOR
OPEN
MECHANISM
The door can be opened
by pushing
the open button
on the
control
panel,
refer to Figure
D-l.
When
the open button
is
pushed,
the open plate on the open device pushes in the door
lever on the door, operating
the latch head linkage.
The lower
and upper latch heads are moved
upward,
and released
from
the lower and upper latch hooks. Now, the door can be opened.
DOOR
/ASSEMBLY
UPPER
LATCH
HEAD
DOOR
OPEN
BUTTON
Figure
D-l.
Door Open Mechanism
LOWER
AND
UPPER LATCH
SWITCHES
The lower latch switch
is mounted
in the lower latch hook and
the upper latch switch
is mounted
in the upper latch hook. They
are activated
by the latch heads
on the door. When
the door
is opened,
the switches
interrupt
the circuit to all components
except the oven lamp.
A cook cycle cannot
take place until the door is firmly
closed
therebv
activating
both interlock
switches.
MONITOR
SWITCH
The monitor switch,
mounted
on the upper latch hook, is actl-
vated
(the contacts
opened)
by the upper
latch
head on the
door while the door is closed.
This switch
is intended
to render
the Oven inoperative
by means
of blowing
the fuse when the
COntaCtS
of the upper latch switch
failes to open when the door
is opened.
Functions:
1. When the door is opened,
the monitor
switch
contacts
close
(to ON condition)
due to their being normally
closed. At this
time the upper
latch switch
is in the OFF condition
(con-
tacts
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 upper
latch switch
contacts
close.
(On
opening
the
door,
each
of these
switches
operate
inversely.)
3. If the door is opened
and the upper latch switch
contacts
fail to open,
the fuse blows
simultaneously
with the clos-
ing of the monitor
switch
contacts.
CAUTION:
BEFORE
REPLACING
A
BLOWN
FUSE,
TEST
THE
UPPER
LATCH
SWITCH
SWITCH
AND
MONITOR
SWITCH
FOR
PROPER
OPERATION.
(REFER TO CHAPTER
"TEST
PROCEDURE")
UPPER
LATCH
HOOK
MONITOR
SWITCH
UPPER
LATCH
SWITCH
LOWER
LATCH
HOOK
STOP
SWITCH
LOWER
LATCH
SWITCH
,
Figure
D-2.
Latch Switches
and Monitor
Switch
s
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