R-216 (serv.man2). Complete - Sharp Home Appliance Service Manual (repair manual). Page 7

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The thermal cut-out located on the top of the oven cavity
is designed to prevent damage to the oven if the foods in
the oven catch fire due to over heating produced by
improper setting of cook time or failure of control unit.
Under normal operation, the thermal cut-out remains
closed. However, when abnormally high temperatures are
reached within the oven cavity, the thermal cut-out will
open at 125˚C, causing the oven to shut down. The
defective thermal cut-out must be replaced with a new
one.

The thermal cut-out located on the top of the oven cavity
is designed to prevent damage to the magnetron if an over
heated condition develops in the tube due to cooling fan
failure, obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the thermal cut-out remains
closed. However, when abnormally high temperatures are
reached within the magnetron, the thermal cut-out will
open at  95˚C, causing the oven to shut down. When the
magnetron has cooled  to 75˚C, the thermal cut-out closes
and cook cycle will resume.

The turntable motor drives the roller stay to rotate the
turntable.

The fan motor drives a blade which draws external cool air.
This cool air is directed through the air vanes surrounding
the magnetron and cools the magnetron. This air is chan-
nelled through the oven cavity to remove steam and
vapours given off from the heating foods. It is then ex-
hausted through the exhausting air vents at the oven
cavity.

The noise filter prevents the radio frequency interference
that might flow back in the power circuit.

The door is opened by pulling the door, refer to the Figure
D-1.

1. When the oven door is closed, the contacts (COM-NO)

must be closed.

2. When the oven door is opened, the contacts (COM-

NO) must be opened.

1. When the oven door is closed, the contacts (COM-NC)

must be opened.

2. When the oven door is opened, the contacts (COM-

NC) must be closed.

3. If the oven door is opened and the contacts (COM-NO)

of the monitored latch switch fail to open, the fuse
T6.3A blows simultaneously with closing the contacts
(COM-NC) of the monitor switch .

CAUTION: BEFORE REPLACING A FUSE TEST THE

MONITORED LATCH SWITCH AND
MONITOR SWITCH   FOR PROPER OP-
ERATION. (REFER TO CHAPTER "TEST
PROCEDURE".)

1. The fuse T6.3A blows when the contacts (COM-NO) of

the monitored latch switch remain closed with the oven
door open and when the monitor switch   closes.

2. If the wire harness or electrical components are short-

circuited, the fuse T6.3A blows to prevent an electric
shock of fire hazard.

The high voltage fuse blows when the high voltage rectifier
or the magnetron is shorted.

Latch Heads

Latch Hook

Door

Monitor
Switch

Monitored
Latch
Switch

2nd. Interlock
Relay Control
 Switch