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R-630A (W)
R-630A (IN)
R-6304 (B)
_ FUNCTION OF IMPORTANT COMPONENTS
MONITOR SWITCH
The monitor switch is activated (the contacts opened) by
the latch head on the door while the door is closed. The
switch is intended to render the oven inoperative by
means of blowing the fuse F8A when the contacts of the
1st latch switch fail to open when the door is opened.
Function
1. When the door is opened, the contacts (COM-NC) of
monitor switch close (to the ON condition) due to their
being normally closed and contacts (COM-NO) open.
At this time the latch switch is 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
switch contacts (COM-NC) are opened and stop switch
contacts (COM-NO) are closed. And then contacts of
the latch switch closed. (On opening the door, each of
these switches operate inversely.)
3. Ifthe door is opened and the latch switch contacts fail
to open, the fuse F8A blows immediately after closing
of the monitor switch (COM-NC) contacts,
CAUTION: BEFORE REPLACINGABLOWNFUSE F8A
TEST THE
LATCH,
MONITOR
SWITCH
AND MONITOR RESISTOR FOR PROPER
OPERATION.
(REFER
TO CHAPTER
"TEST PROCEDURE').
GRILL HEATING ELEMENT GH
The grill heating element is provided to brown the food and
is located on the top of the oven cavity.
NOISE FILTER
The noise filter assembly prevents radio frequency inter-
ference that might flow back in the power circuit.
ASYMMETRIC RECTIFIER
The asymmetric rectifier is a solid state device that
prevents current flow in both directions, And it prevents
the temperature rise of the high voltage transformer by
blowing the fuse F8A when the high voltage rectifier is
shorted.
ASYMMETRIC
RECTIFIER
C/
HIGH VOLTAGE RECTIFIER
The rated peak reverse voltage of D1 of the asymmetric
rectifier is 6 KV The rated peak reverse voltage of D2 of
the asymmetric rectifier is 1.7 KV. D1 and D2 of the
asymmetric rectifier or high voltage rectifier are shorted
when the each peak reverse voltage goes beyond the
each rated peak reverse voltage. (The process of blowing
the fuse F8A.)
2. The peak reverse voltage of D2 of the rectifier goes
beyond the rated peak reverse voltage 1.7 KV in the
voltage doubler circuit.
3. D2 of the rectifier is shorted.
4. The large electric currents flow through the high
voltage winding of the high voltage transformer.
5. The large electric currents beyond F8A flow through
the primary winding of the high voltage transformer.
6. The fuse F8A blows by the large electric currents.
7. The power supply to the high voltage transformer is
cut off.
TURNTABLE MOTOR TIM
The turntable motor drives the roller stay to rotate the
turntable.
FAN MOTOR EM
The fan motor drives a blade which draws external cool
air. This cool air is directed through the air vanes sur-
rounding the magnetron and cools the magnetron, This
air is channelled through the oven cavity to remove
steam and vapours given off from the heating foods, It is
then exhausted through the exhausting air vents at the
oven cavity.
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