Sharp R-210A Operation Sequence, OFF Condition, Microwave Cooking Condition, High Cooking

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R-210A

OPERATION SEQUENCE

OFF CONDITION

1.When the timer knob is at " 0 ", the oven is OFF condition.

2.Closing the oven door activates the 1st latch switch, the 2nd latch switch and monitor switch.

IMPORTANT:

When the oven door is closed, the contacts COM-NC of the monitor switch must be open.

Figure O-1 on page 20

MICROWAVE COOKING CONDITION

HIGH COOKING

Set the variable cooking control to HIGH and then set the timer.

7-1. When the oven door is opened during or after the cycle of a cooking program, the 1st latch switch and 2nd latch switch must open their (COM-NO) contacts first. After that the contacts (COM-NC) of the monitor switch can be closed.

7-2. When the oven door is closed. The contacts (COM- NC) of the monitor switch must be opened and the contacts (COM-NO) of the 2nd latch switch and the 1st latch switch must be closed.

7-3. When the oven door is opened and the (COM-NO) contacts of the 1st latch switch and the contacts (COM-NO) of the 2nd latch switch remain closed, the fuse 13A will blow, the monitor switch is closed and a short circuit is caused.

Function sequence

Figure O-2 on page 20

1. Following components are energized.

Power transformer

H.V. capacitor

Timer motor

Magnetron

H.V. rectifier

Fan motor

H. V. fuse

Turntable motor

Oven lamp

2.Rated voltage is supplied to the primary winding of the power transformer. The voltage is converted to about 3.3 volts A.C. output on the filament winding and high voltage of approximately 2000 volts A.C. on the sec- ondary winding.

3.The filament winding voltage (3.3 volts) heats the magnetron filament and the high voltage (2000 volts) is sent to the voltagedoubling circuit, where it is doubled to negative voltage of approximately 4000 volts D.C..

4.The 2450 MHz microwave energy produced in the magnetron generates a wave length of 12.24 cm. This energy is channelled through the waveguide (transport channel) into the oven cavity, where the food is placed to be cooked.

5.When the cooking time is up, the timer returns to "0", the bell rings and the contacts of the timer are opened. Then following components are turned off.

Power transformer

Magnetron

Timer motor

Turntable motor

H.V. capacitor

Fan motor

H. V. fuse

H.V. rectifier

Oven lamp

6.When the oven door is opened during a cooking cycle, the switches come to the following positions and they are common to the other cooking conditions too.

Switch

Contact

Condition

 

 

 

During

Oven Door

 

 

Cooking

Open(No cooking)

1st latch Switch

COM-NO

Closed

Opened

 

 

 

 

Monitor Switch

COM-NC

Opened

Closed

2nd latch switch

COM-NO

Closed

Opened

The circuit to the power transformer, turntable motor, timer motor, fan motor and oven lamp are cut off when the COM-NO contacts of the 2nd latch switch and 1st latch switch are made open. The timer stops to indicate how much cooking time remains.

7.MONITOR SWITCH CIRCUIT

The monitor switch is mechanically controlled by the oven door, and monitors the operation of the 1st latch switch and 2nd latch switch.

MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW COOKING

When the microwave oven is preset for variable cooking power, the rated voltage is supplied to the power trans- former intermittently within a 30-second time base through the vari switch. The following levels of microwave power are given.

SETTING

30 sec. ON

 

 

 

HIGH

 

 

 

 

 

 

Approx. 100%

 

23.2 sec. ON

6.8 sec. OFF

MEDIUM HIGH

 

 

 

 

 

 

Approx. 70%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16.5 sec. ON

13.5 sec. OFF

MEDIUM

 

 

 

 

 

 

Approx. 50%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9.8 sec. ON 20.2 sec. OFF

MEDIUM LOW

 

 

 

 

 

 

Approx. 30%

 

 

 

 

 

 

 

5.0 sec. ON

25 sec. OFF

LOW

 

 

 

 

 

 

Approx. 10%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note: The ON/OFF time ratio does not exactly corre- spond to the percentage of microwave power, because approx. 2 seconds are needed for heat- ing up the magnetron filament.

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Contents Table of Contents Model R-210A210A 210A Sharp Corporation OSAKA, JapanMicrowave Oven General Important InformationSpecification This Appliance Must be EarthedMedium LOW/ Defrost Appearance View Control PanelMicrowave Cooking Condition Operation SequenceOFF Condition Medium HIGH, MEDIUM, Medium LOW, LOW CookingFunction of Important Components Remember to Check 3D Troubleshooting GuideServicing Remember to Check 4RProblem Troubleshooting ChartTest Procedure Possible Cause Defective Parts C D E E E F F I I I G G HJ KTest Procedures Letter Component Test Magnetron Test Microwave Output Power IECTest Procedures Component Test Letter Microwave Output Power 2 Litre water loadΔT1 Carry OUT 4R Checks Test Procedures Letter Component TestPower Transformer Test High Voltage Rectifier Test Carry OUT 3D ChecksMotor Winding Test Carry OUT 3D Checks Switch TestTemperature Fuse or Thermal CUT-OUT Test Fuse 13ATimer Motor Timer Motor with VARI-SWITCH TestTimer SWITCH- Contacts Noise Filter Test Carry OUT 3D ChecksOuter Case Removal Component Replacement and Adjustment ProcedurePower Transformer Removal To prevent an electric shock, take the followingRe-install Magnetron ReplacementPositive Lock Connector Removal Oven Lamp Socket RemovalFAN Motor Replacement Power Supply Cord ReplacementTurntable Motor Replacement RemovalControl Panel Assembly and Switch LE- VER Removal Control Panel Assembly and Switch Lever RemovalInstallation Rear ViewDoor Replacement After adjustment, make sure of the followingRE-INSTALL Installation Sealer FilmRequirement Preparation for TestingMicrowave Measurement Holaday HI Simpson 380MOven Schematic-ON Condition Oven Schematic-OFF ConditionFigure S-1. Pictorial Diagram High Voltage ComponentsControl Panel Parts Electric PartsCabinet Parts Oven PartsPacking and Accessories SCREWS,NUTS and WashersInterchangeability↔ Oven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous 210A

R-210A specifications

The Sharp R-210A is a notable microwave oven that stands out in the crowded kitchen appliance market. Renowned for its practicality and efficiency, this model is designed to cater to the needs of modern households while offering an array of advanced features.

One of the key highlights of the Sharp R-210A is its powerful 1000 watts of cooking power, which ensures quick cooking and reheating. With a range of cooking options, this microwave can handle various tasks from defrosting frozen foods to cooking meals evenly and efficiently. The unit boasts a 22-liter capacity, making it suitable for small to medium-sized kitchens. Its compact design allows for easy integration into different kitchen layouts without taking up excessive counter space.

The Sharp R-210A employs innovative technology to enhance cooking performance. It features a turntable system that ensures food is cooked uniformly by rotating dishes during the cooking cycle. This feature is particularly advantageous when heating large or unevenly shaped food items, as it helps prevent cold spots. Additionally, the microwave includes a convection option, bringing versatility to food preparation by combining microwave energy with convection heat to produce crispy results akin to traditional ovens.

User-friendliness is a hallmark of the Sharp R-210A, with an intuitive control panel that simplifies operation. The keypad is designed for easy navigation, allowing users to select cooking times and power levels quickly. It also includes pre-programmed settings for popular dishes, making meal preparation even more straightforward. The microwave features a timer and clock function, providing added convenience.

Safety is a crucial consideration in microwave design, and the Sharp R-210A does not disappoint. It comes equipped with a child lock feature to prevent accidental operation, making it a suitable choice for families. The unit also has an automatic shut-off feature that activates after cooking, reducing the risk of overheating or burning food.

In summary, the Sharp R-210A microwave oven combines robust power, innovative technology, and user-friendly features. With its ample capacity, intuitive controls, and safety measures, it continues to be a reliable choice for those looking to simplify their cooking experiences in the kitchen. Whether you're reheating leftovers or preparing a full meal, the Sharp R-210A is equipped to meet various culinary needs with ease and efficiency.
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