Sharp R-2397 Test Procedures Contd, To determine if the control unit or key pad is at fault

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R-2397

 

TEST PROCEDURES (CONT'D)

PROCEDURE

COMPONENT TEST

LETTER

 

 

If a specific pad does not respond, the above method may be used (after clearing the control unit)

 

to determine if the control unit or key pad is at fault.

 

 

P

RELAY TEST

 

CARRY OUT 3D CHECKS.

 

Remove the outer case and check voltage between Pin Nos. 5 and 7 of the connector (A) on the

 

control unit with an A.C. voltmeter. The meter should indicate 230 volts, if not check control unit

 

circuity.

RY1, RY3 and RY4 Relay Test

These relays are operated by D.C. voltage.

Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.

DC. voltage indicated

Defective relay.

DC. voltage not indicated

Check diode which is connected to the relay coil. If

 

 

diode is good, control unit is defective.

 

 

 

 

RELAY SYMBOL

OPERATIONAL VOLTAGE

CONNECTED COMPONENTS

 

 

 

 

 

 

RY1

APPROX. 19.0V D.C.

 

Oven lamp, Blower motor and Stirrer motor

 

RY3

APPROX. 16.0V D.C.

 

Power transformer 1

 

RY4

APPROX. 18.0V D.C.

 

Power transformer 2

 

 

 

 

 

 

CARRY OUT 4R CHECKS.

QPROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN

To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given below for repair.

Problem: POWER ON, indicator does not light up.

CARRY OUT 3D CHECKS.

STEPS

OCCURANCE

CAUSE OR CORRECTION

1

The rated AC voltage is not present at

Check supply voltage and oven power cord.

 

POWER terminal of CPU connector (CN-A).

 

2

The rated AC voltage is present at primary

Low voltage transformer or secondary circuit defective.

 

side of low voltage transformer.

Check and repair.

3

Only pattern at "a" is broken.

*Insert jumper wire J24 and solder.

 

 

(CARRY OUT 3D CHECKS BEFORE REPAIR)

 

 

 

4

Pattern at "a" and "b" are broken.

*Insert the coil RCILF2003YAZZ between "c" and "d".

 

 

(CARRY OUT 3D CHECKS BEFORE REPAIR)

 

 

 

NOTE: *At the time of these repairs, make a visual inspection of the varistor for burning damage and examine the transformer with tester for the presence of layer short-circuit (check primary coil resistance). If any abnormal condition is detected, replace the defective parts.

CARRY OUT 4R CHECKS.

 

 

 

d

 

(J29)

 

 

 

(J24)

VRS1

 

RY1

a

 

(VRS2)

 

 

 

b

 

 

3(1)

5(3)

(J23)

c

9(7)

(9)

 

16

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Contents Table of Contents Commercial Microwave Oven2397 2397 Sharp Corporation OSAKA, JapanCommercial General Important InformationGeneral Information SpecificationProduct Description DescriptionAppearance View Installation InformationDisplay and Indicators Operating KeysMicrowave Cooking Condition Operation SequenceOFF Condition Microwave Variable CookingFunction of Important Components Intake Thermistor Asymmetric RectifierExhaust Thermistor Magnetron ThermistorRemember to Check 3D Troubleshooting GuideServicing Remember to Check 4RTest Procedure Possible Cause Defective Parts Plugged into wall outletTemperature of Intake Thermistor is High Microwave Output Power IEC-705-1988 Test ProceduresProcedure Component Test Letter Magnetron Test Around 20 C Power supply Voltage Rated voltageCarry OUT 3D Checks Procedure Letter Component TestHigh Voltage Transformer Test Carry OUT 4R ChecksHigh Voltage Capacitor Test Carry OUT 3D Checks Procedure Component Test LetterSwitch Test Weak Point A018Table Thermal Cut-out Test Fuse F6.3A TestThermal CUT-OUT Test Carry OUT 3D Checks Monitor Resistor Test Carry OUT 3D ChecksIntake Thermistor Test Procedure Component Test Letter Magnetron Thermistor TestExhaust Thermistor Test Motor Winding TestTouch Control Panel Assembly Test Min Cx ± 20% Cy ± 20% 5mHKEY Unit Test Relay Test Test Procedures ContdTo determine if the control unit or key pad is at fault CircuityStop Switch Circuit Power Supply CircuitPower Sync Signal Generating Circuit Exhaust Air Temperature Detecting CircuitDescription of LSI LSIIZA646DR Power source voltage Pin No Signal DescriptionInternal clock oscillation frequency setting input Signal coming from touch keySound Voltage level control terminal Shapes of Electronic Components Other PrecautionsServicing Servicing of Touch Control PanelProcedure for Entering to IC-2 Practice for checking total service counts eg 234,567 CountsTo check the contents of defrost Flicker / 0.1 sec Buzzer Other Checking and Clearing PRO CedureHigh Voltage Components Removal Component Replacement and Adjustment ProcedureOuter Case Removal To remove the components, proceed as followsBlower Motor Removal Magnetron RemovalHigh Voltage Transformer Removal Stirrer Motor Upper RemovalControl Panel Assembly Removal Control Panel Assembly and Control Unit RemovalHOW to Release the Positive Lock Connector ProcedurePower Supply Cord Replacement Re-installAfter adjustment, make sure of the following Door Adjustment Door Replacement and AdjustmentDoor Replacement Choke Cover RemovalMicrowave Measurement Service InformationPreparation for Testing RequirementFigure O-1. Oven SChematic-OFF Condition High Voltage Components Circuit C d eFigure S-3. Printed Wiring Board Electric Parts Parts ListParts marked * are used in voltage more than Cabinet PartsVCEAB31HW104M Oven Parts Door PartsMiscellaneous SCRE, Nuts and WashersREF. no HOW to Order Replacement PartsModel Number 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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