R-209 - Sharp Home Appliance Service Manual (repair manual). Page 7

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The door is opened by pushing the open button on the
control panel, refer to the Figure D-1.
When the open button is pushed, the open button pushes
up the switch lever, and then the switch lever pushes up
the latch head. The latch heads are moved upward and
released from latch hook. Now the door will open.

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

must be closed.

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 he contacts (COM-NO)

of the moniored latch switch  fail to open, the fuse
T6.3A blows immediately after closing the contacts
(COM-NC) of the monitor switch .

CAUTION: BEFORE REPLACING A BLOWN FUSE

TEST MONITORED LATCH SWITCH  AND
MONITOR SWITCH  FOR PROPER OPERA-
TION.  (REFER TO CHAPTER “TEST PRO-
CEDURE”).

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 contacts (COM-NC) of
the monitor switch  are closes.

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

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

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

The temperature fuse, located on the top of the oven
cavity, 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 temperature fuse will open.
Under normal operation, the temperature fuse remains
closed. However, when abnormally high temperatures are
reached within the oven cavity, the temperature fuse will
open at 120˚C, causing the oven to shut down.

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

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

1. When the timer switch is at "0" position, the switch of

the timer is opened.

2. When the timer is turned clockwise from "0" position,

the switch of the timer is closed.

The noise filter assembly prevents radio frequency inter-
ference that might flow back in the power circuit.

Latch Heads

Latch Hook

Door

Monitored
Latch Switch

Monitor Switch

Switch Lever

Latch Switch