Sharp R-210A Test Procedures Letter Component Test, Power Transformer Test, Carry OUT 4R Checks

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R-210A

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

CAUTION: 1˚C CORRESPONDS TO 60 WATTS. REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.

1 l

1 l

1 l

1 l

(T1C) (T2C)

(T1C) (T2C)

Heat up for 2 min. 22 sec.

BPOWER TRANSFORMER TEST

WARNING: High voltages and large currents are present at the secondary winding and filament winding of the power transformer. It is very dangerous to work near this part when the oven is on. NEVER make any voltage measurements of the high- voltage circuits, including the magnetron filament.

CARRY OUT 3D CHECKS.

Disconnect the leads to the primary winding of the power transformer. Disconnect the filament and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range, it is possible to check the continuity of all three windings. The following readings should be obtained:

a.Primary winding

0.5 ohms approximately

b.Secondary winding

107 ohms approximately

c.Filament winding

less than 1 ohm

If the reading obtained are not stated as above, then the power transformer is probably faulty and should be replaced.

CARRY OUT 4R CHECKS.

CHIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS.

Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal B+C of the

high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading. The normal resistance is infinite in one direction and more than 100 kΩ in the other direction.

CARRY OUT 4R CHECKS.

B

C

HIGH VOLTAGE RECTIFIER

NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BE- CAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIREC- TIONS.

DHIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS.

A.Isolate the high voltage capacitor from the circuit.

B.Continuity check must be carried out with measuring instrument which is set to the highest resistance range.

C.A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ after it has been charged.

D.A short-circuited capacitor shows continuity all the time.

E.An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance.

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Contents Table of Contents Model R-210A210A Sharp Corporation OSAKA, Japan Microwave Oven210A General Important InformationSpecification This Appliance Must be EarthedMedium LOW/ Defrost Appearance View Control PanelOperation Sequence OFF ConditionMicrowave Cooking Condition Medium HIGH, MEDIUM, Medium LOW, LOW CookingFunction of Important Components Troubleshooting Guide ServicingRemember to Check 3D Remember to Check 4RTroubleshooting Chart Test Procedure Possible Cause Defective PartsProblem 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 Test Procedures Letter Component Test Power Transformer TestCarry OUT 4R Checks High Voltage Rectifier Test Carry OUT 3D ChecksSwitch Test Temperature Fuse or Thermal CUT-OUT TestMotor Winding Test Carry OUT 3D Checks Fuse 13ATimer Motor with VARI-SWITCH Test Timer SWITCH- ContactsTimer Motor Noise Filter Test Carry OUT 3D ChecksComponent Replacement and Adjustment Procedure Power Transformer RemovalOuter Case Removal To prevent an electric shock, take the followingMagnetron Replacement Positive Lock Connector RemovalRe-install Oven Lamp Socket RemovalPower Supply Cord Replacement Turntable Motor ReplacementFAN Motor Replacement RemovalControl Panel Assembly and Switch Lever Removal InstallationControl Panel Assembly and Switch LE- VER Removal Rear ViewDoor Replacement After adjustment, make sure of the followingRE-INSTALL Installation Sealer FilmPreparation for Testing Microwave MeasurementRequirement Holaday HI Simpson 380MOven Schematic-ON Condition Oven Schematic-OFF ConditionFigure S-1. Pictorial Diagram High Voltage ComponentsElectric Parts Cabinet PartsControl Panel 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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