Function Of Important Components - Sharp R-216(G) Service Manual

R-216(G)
R-216(IN)
R-216(W)
R-216(Y)
DOOR OPEN MECHANISM
The door is opened by pulling the door, refer to the Figure
D-1.
Latch Heads
SW1: Monitored
Door
Latch
Switch
Figure D-1. Door Open Mechanism
MONITORED LATCH SWITCH SW1 AD 2ND. IN-
TERLOCK RELAY CONTROL SWITCH SW3
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.
MONITOR SWITCH SW2
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 SW1 and 2nd. interlock
relay RY2 fail to open, the fuse F1 blows simultane-
ously with closing the contacts (COM-NC) of the moni-
tor switch SW2.
CAUTION: BEFORE REPLACING A FUSE F1 TEST
THE MONITORED LATCH SWITCH SW1,
2ND. INTERLOCK RELAY RY2, 2ND. IN-
TERLOCK RELAY CONTROL SWITCH
SW3, AND MONITOR SWITCH SW2 FOR
PROPER OPERATION. (REFER TO CHAP-
TER "TEST PROCEDURE".)
FUSE F1
1. The fuse F1 blows when the contacts (COM-NO) of the
monitored latch switch SW1 and 2nd. interlock relay
RY2 remain closed with the oven door open and when
the monitor switch SW2 closes.
2. If the wire harness or electrical components are short-
circuited, the fuse F1 blows to prevent an electric shock
of fire hazard.
HIGH VOLTAGE FUSE F2
The high voltage fuse F2 blows when the high voltage
rectifier or the magnetron is shorted.

FUNCTION OF IMPORTANT COMPONENTS

Latch Hook
SW3:
2nd. Interlock
Relay Control
Switch
SW2:
Monitor
Switch
THERMAL CUT-OUT TC2 125˚C (OVEN)
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.
THERMAL CUT-OUT TC1 95˚C (MAGNETRON )
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.
TURNTABLE MOTOR TTM
The turntable motor drives the roller stay to rotate the
turntable.
FAN MOTOR FM
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.
NOISE FILTER
The noise filter prevents the radio frequency interference
that might flow back in the power circuit.
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