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R-930AK

R-930AW

HEATING ELEMENT

The heating element is located at the left side of the oven

cavity. It is intended to heat air driven by the convection fan.

The heated air is kept in the oven and force-circulated and

reheated by the heating element.

CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where

food is not directly heated by the heating element, but is

heated by forced circulation of the hot air produced by the

heating element.

The air heated by the heating element is circulated through

the convection passage provided on the outer casing of the

oven cavity by means of the convection fan which is driven

by the convection motor. It then enters the inside of the oven

through the vent holes provided on the left side of the oven.

Next, the hot air heats the food on the turntable and leaves

the oven cavity through the vent in the center of the oven

cavity left side wall.

Without leaving the oven, this hot air is reheated by the

heating element, passes through the convection passage

and enters the inside of the oven cavity again, in a continu-

ing cycle.

In this way, the hot air circulates inside the oven cavity to

raise its temperature and, at the same time, comes into

contact with the food being cooked.

When the temperature inside the oven cavity reaches the

selected temperature, the heating element is de-energized.

When the temperature inside the oven cavity drops below

the selected temperature, the heating element is energized

again. In this way, the inside of the oven cavity is maintained

at approximately the selected temperature.

When the convection time reaches 0, the heating element is

de-energized and the convection fan stops operating and

the oven shuts off.

DAMPER OPEN-CLOSE MECHANISM

Usually, the damper is in the open position except during

convection cooking. Damper position is set automatically by

damper motor, damper switch, motor cam and damper

shaft. These components are operated by a signal that

judges if microwave cooking or convection cooking opera-

tion is selected by the control unit.

Microwave Cooking:

Damper is in the open position, because a portion of cooling

air is channelled through the cavity to remove steam and

vapors given off from the heating foods.

It is then exhausted at the top of the oven cavity into a

condensation compartment.

Convection Cooking:

When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many

of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which

will be found in the "Test Procedure"section.

IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, primary interlock

relay, door sensing switch and secondary interlock switch before replacing the monitor fuse. If monitor fuse

is replaced, the mintor switch must olso be replaced at the same time. Use part FFS-BA012WRK0 as an

assembly.

Damper is in the closed position, so that no hot air will be

allowed to leak out the oven cavity.

Damper Operation

1. When power supply cord is plugged in:

2. When oven is microwave cooking:

3. When oven is convection cooking:

NOTE: If the damper door is not in the proper position,

TROUBLESHOOTING GUIDE

1-1. When power supply cord is plugged in, a signal is

sensed in the control unit, and operates shut-off

relay (RY4).

1-2. Contacts of shut-off relay (RY4) close, the damper

motor is energized, opening the damper door.

1-3. When the damper is moved to the open position by

the damper cam the damper switch is closed (ON

position).

1-4. The signal from damper switch is re-sensed in the

control unit and shut-off relay (RY4) is turned off.

1-5. The 120 volts A.C. to the damper motor is removed

and the motor turns off.

Damper is in the open position.

3-1. Damper motor is energized by touching the

convection, temperature and START pads.

3-2. When damper is in the closed position (damper

switch is OFF), its signal is sensed by the control

unit, and shut-off relay (RY4) is de-energized.

3-3. The damper is held in the closed position during the

convection cooking operation.

3-4. At the end of the convection cooking, shut-off relay

(RY4) is energized, and the damper is returned to

the open position.

closed during convection or open during microwave,

the control unit will stop oven operation after 1

minute.

DAMPER SHAFT

Figure D-2. Damper Mechanism

DAMPER DUCT

DAMPER

DAMPER CAM

DAMPER SWITCH

DAMPER MOTOR