Sharp Carousel R-350C Service-Handbuch - Seite 7

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DOOR OPEN MECHANISM

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 the latch head. The latch heads are moved upward and

released from latch hook. Now the door will open.

Door

Latch

Heads

Switch Lever

Figure D-1. Door Open Mechanism

1ST. LATCH SWITCH, 2ND. LATCH SWITCH AND

STOP SWITCH

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

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 1st. latch switch and 2nd. latch switch fail to open,

the fuse M10A blows simultaneously with closing the

contacts (COM-NC) of the monitor switch.

CAUTION: BEFORE REPLACING A BLOWN FUSE

M10A TEST THE 1ST. LATCH SWITCH, 2ND.

LATCH SWITCH MONITOR SWITCH AND

MONITOR RESISTOR FOR PROPER OP-

ERATION.

MONITOR RESISTOR 0.8 20W

The monitor resistor prevents the fuse M10A bursting

when the fuse M10A blows due to the operation of the

monitor switch.

HIGH VOLTAGE FUSE

The high voltage fuse blows when the high voltage rectifier

or magnetron is shorted.

FUSE M10A

1. The fuse M10A blows when the contacts (COM-NO) of

the 1st. latch switch and 2nd. latch switch remain

closed with the oven door open and when the monitor

switch closes.

FUNCTION OF IMPORTANT COMPONENTS

Latch Hook

2nd. Latch

Switch

Monitor Switch

1st. Latch

Switch

Stop Switch

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

circuited, this fuse M10A blows to prevent an electric

shock or fire hazard.

OVEN THERMAL CUT-OUT

The thermal cut-out, located on the top of the oven cavity,

is designed to prevent damage to the oven by fire. If the

foods load is overcooked, by either error in cook time or

defect in the control unit, the thermal cut-out will open.

Under normal operation, the oven thermal cut-out remains

closed. However, when abnormally high temperatures are

reached within the oven cavity, the oven thermal cut-out

will open at 125˚C, causing the oven to shut down. The

defective thermal cut-out must be replaced with new one.

MAGNETRON THERMAL CUT-OUT

The thermal cut-out located near the magnetron is de-

signed 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

The turntable motor drives the turntable roller assembly to

rotate the turntable.

FAN MOTOR

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

channeled through the oven cavity to remove steam and

vapors 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.

R-350C