Sharp R-2397 Procedure Letter Component Test, High Voltage Transformer Test, Carry OUT 3D Checks

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R-2397

 

TEST PROCEDURES

 

 

 

 

PROCEDURE

 

 

LETTER COMPONENT TEST

 

 

 

 

 

Initial temperature

T1 = 11°C

 

Temperature after (25 + 3) = 28 sec

T2 = 21°C

 

Temperature difference Cold-Warm

ΔT = 10°C

 

Measured output power

 

 

The equation is “P = 170 x ΔT”

P = 170 x 10°C = 1700 Watts

 

 

 

JUDGMENT: The measured output power should be at least ± 15 % of the rated output power.

CAUTION: 1°C CORRESPONDS TO 170 WATTS. REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.

1000g

1000g

1000g

T1˚C

T2˚C

Heat up for 28 sec.

BHIGH VOLTAGE TRANSFORMER TEST

WARNING: High voltages and large currents are present at the secondary winding and filament winding of high voltage 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 high voltage 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

approx. 1.06 Ω

 

 

b. Secondary winding

approx. 57.3 Ω

 

 

c. Filament winding

less than 1 Ω

 

 

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

CARRY OUT 4R CHECKS.

CHIGH VOLTAGE RECTIFIER ASSEMBLY TEST HIGH 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 infinity in one direction and more than 100 kΩ in the other direction.

CARRY OUT 4R CHECKS.

A

 

ASYMMETRIC RECTIFIER TEST

CARRY OUT 3D CHECKS.

D2

D1

B

 

 

 

 

 

 

 

 

ASYMMETRIC

RECTIFIER

CHIGH VOLTAGE RECTIFIER

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Contents Commercial Microwave Oven Table of Contents2397 Commercial Sharp Corporation OSAKA, Japan2397 General Important InformationProduct Description SpecificationGeneral Information DescriptionDisplay and Indicators Installation InformationAppearance View Operating KeysOFF Condition Operation SequenceMicrowave Cooking Condition Microwave Variable CookingFunction of Important Components Exhaust Thermistor Asymmetric RectifierIntake Thermistor Magnetron ThermistorServicing Troubleshooting GuideRemember to Check 3D Remember to Check 4RPlugged into wall outlet Test Procedure Possible Cause Defective PartsTemperature of Intake Thermistor is High Procedure Component Test Letter Magnetron Test Test ProceduresMicrowave Output Power IEC-705-1988 Around 20 C Power supply Voltage Rated voltageHigh Voltage Transformer Test Procedure Letter Component TestCarry OUT 3D Checks Carry OUT 4R ChecksSwitch Test Procedure Component Test LetterHigh Voltage Capacitor Test Carry OUT 3D Checks Weak Point A018Thermal CUT-OUT Test Carry OUT 3D Checks Fuse F6.3A TestTable Thermal Cut-out Test Monitor Resistor Test Carry OUT 3D ChecksExhaust Thermistor Test Procedure Component Test Letter Magnetron Thermistor TestIntake Thermistor Test Motor Winding TestMin Cx ± 20% Cy ± 20% 5mH Touch Control Panel Assembly TestKEY Unit Test To determine if the control unit or key pad is at fault Test Procedures ContdRelay Test CircuityPower Sync Signal Generating Circuit Power Supply CircuitStop Switch Circuit Exhaust Air Temperature Detecting CircuitDescription of LSI LSIIZA646DR Internal clock oscillation frequency setting input Pin No Signal DescriptionPower source voltage Signal coming from touch keySound Voltage level control terminal Servicing Other PrecautionsShapes of Electronic Components Servicing of Touch Control PanelPractice for checking total service counts eg 234,567 Counts Procedure for Entering to IC-2Other Checking and Clearing PRO Cedure To check the contents of defrost Flicker / 0.1 sec BuzzerOuter Case Removal Component Replacement and Adjustment ProcedureHigh Voltage Components Removal To remove the components, proceed as followsHigh Voltage Transformer Removal Magnetron RemovalBlower Motor Removal Stirrer Motor Upper RemovalHOW to Release the Positive Lock Connector Control Panel Assembly and Control Unit RemovalControl Panel Assembly Removal ProcedureRe-install Power Supply Cord ReplacementAfter adjustment, make sure of the following Door Replacement Door Replacement and AdjustmentDoor Adjustment Choke Cover RemovalPreparation for Testing Service InformationMicrowave Measurement RequirementFigure O-1. Oven SChematic-OFF Condition High Voltage Components C d e CircuitFigure S-3. Printed Wiring Board Parts marked * are used in voltage more than Parts ListElectric Parts Cabinet PartsVCEAB31HW104M Door Parts Oven PartsSCRE, Nuts and Washers MiscellaneousModel Number HOW to Order Replacement PartsREF. no DescriptionOven and Cabinet Parts Control Panel Parts Door Parts Not replaceable items 2397

R-2397 specifications

The Sharp R-2397 is a high-performance microwave oven that combines advanced technology with user-friendly features, making it a popular choice for modern kitchens. This model stands out due to its sleek design and efficient functionality, catering to both cooking enthusiasts and busy households alike.

One of the most notable features of the Sharp R-2397 is its powerful microwave cooking capabilities. With a wattage rating of 900 watts, it ensures that food is cooked evenly and quickly, allowing users to prepare meals in a fraction of the time compared to conventional ovens. The unit also offers multiple power levels, enabling precise cooking adjustments for various types of food, from defrosting to reheating and everything in between.

Another key characteristic of the R-2397 is its spacious interior. With a generous capacity of 23 liters, this microwave can accommodate larger dishes, making it suitable for families or individuals who enjoy hosting gatherings. The turntable feature promotes even cooking by rotating food continuously, ensuring that every inch is heated uniformly.

Additionally, the Sharp R-2397 is equipped with a range of convenient presets and auto-cook functions. These pre-programmed settings allow users to optimize cooking times for common dishes, such as popcorn, vegetables, and frozen meals, simplifying meal preparation and enhancing user experience. The intuitive control panel is designed to be user-friendly, ensuring that anyone can operate the microwave with ease.

Safety is also a significant consideration in the design of the Sharp R-2397. The unit comes with a child lock function, preventing accidental operation and ensuring that the oven is used safely in households with young children. This feature adds peace of mind for parents while using the appliance in their daily routines.

Moreover, the R-2397 incorporates a modern aesthetic that can fit into various kitchen styles. Its polished exterior and compact design make it both attractive and practical, with the added advantage of easy cleaning and maintenance.

In summary, the Sharp R-2397 is a versatile microwave oven that offers a blend of power, efficiency, and user-centric features. With its high wattage, spacious interior, smart presets, and safety measures, it is an excellent addition to any kitchen, catering to everyday cooking needs and helping to simplify meal times. Whether reheating leftovers or cooking a new recipe, the Sharp R-2397 sets itself apart as a reliable kitchen companion.
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