Sharp R-2397 service manual Fuse F6.3A Test, Thermal CUT-OUT Test Carry OUT 3D Checks

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R-2397

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

GWEAK POINT A017 CARRY OUT 3D CHECKS.

If the weak point A017 is blown, there could be a shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness.

CARRY OUT 4R CHECKS.

CAUTION: Only replace weak point A017 with the correct value replacement.

HFUSE F6.3A TEST

CARRY OUT 3D CHECKS.

If the fuse F6.3A is blown when the door is opened, check the latch switch, monitor switch and monitor resistor.

If the fuse F6.3 is blown by incorrect door switching replace the defective switch(s) and the fuse F6.3A.

CARRY OUT 4R CHECKS.

CAUTION: Only replace fuse with the correct value replacement.

ITHERMAL CUT-OUT TEST CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a continuity test across the each two terminals as described in the table below.

CARRY OUT 4R CHECKS.

Table: Thermal Cut-out Test

 

Temperature of “ON”

Temperature of “OFF”

Indication of ohmmeter

Parts Name

condition (closed circuit).

condition (open circuit).

(When room temperature

 

(˚C)

 

(˚C) is

approx. 20˚C.)

 

 

 

 

Thermal cut-out 145˚C

This is not resetable type.

Above 145˚C

Closed circuit.

 

 

 

 

Thermal cut-out 115˚C

This is not resetable type.

Above 115˚C

Closed circuit

 

 

 

 

 

If incorrect readings are obtained, replace the thermal cut-out.

An open circuit oven thermal cut-out 115˚C indicates that the oven cavity has over heated, this may be due to no load operation.

An open circuit magnetron thermal cut-out 145˚C indicates that the magnetron has overheated, this may be due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.

An open circuit blower motor thermal cut-out 115˚C indicates the blower motor winding has overheated, this may be due to resisted ventilation or locked cooling fan.

JMONITOR RESISTOR TEST CARRY OUT 3D CHECKS.

Disconnect the leads from the monitor resistor. Using an ohmmeter and set on a low range. Check between the terminals of the monitor resistor.

The resistance of monitor resistor should be read approx. 4.3Ω.

If incorrect readings are obtained, replace the monitor resistor.

CARRY OUT 4R CHECKS.

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Contents Commercial Microwave Oven Table of Contents2397 General Important Information Sharp Corporation OSAKA, JapanCommercial 2397Description SpecificationProduct Description General InformationOperating Keys Installation InformationDisplay and Indicators Appearance ViewMicrowave Variable Cooking Operation SequenceOFF Condition Microwave Cooking ConditionFunction of Important Components Magnetron Thermistor Asymmetric RectifierExhaust Thermistor Intake ThermistorRemember to Check 4R Troubleshooting GuideServicing Remember to Check 3DPlugged into wall outlet Test Procedure Possible Cause Defective PartsTemperature of Intake Thermistor is High Around 20 C Power supply Voltage Rated voltage Test ProceduresProcedure Component Test Letter Magnetron Test Microwave Output Power IEC-705-1988Carry OUT 4R Checks Procedure Letter Component TestHigh Voltage Transformer Test Carry OUT 3D ChecksWeak Point A018 Procedure Component Test LetterSwitch Test High Voltage Capacitor Test Carry OUT 3D ChecksMonitor Resistor Test Carry OUT 3D Checks Fuse F6.3A TestThermal CUT-OUT Test Carry OUT 3D Checks Table Thermal Cut-out TestMotor Winding Test Procedure Component Test Letter Magnetron Thermistor TestExhaust Thermistor Test Intake Thermistor TestTouch Control Panel Assembly Test Min Cx ± 20% Cy ± 20% 5mHKEY Unit Test Circuity Test Procedures ContdTo determine if the control unit or key pad is at fault Relay TestExhaust Air Temperature Detecting Circuit Power Supply CircuitPower Sync Signal Generating Circuit Stop Switch CircuitDescription of LSI LSIIZA646DR Signal coming from touch key Pin No Signal DescriptionInternal clock oscillation frequency setting input Power source voltageSound Voltage level control terminal Servicing of Touch Control Panel Other PrecautionsServicing Shapes of Electronic ComponentsPractice 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 BuzzerTo remove the components, proceed as follows Component Replacement and Adjustment ProcedureOuter Case Removal High Voltage Components RemovalStirrer Motor Upper Removal Magnetron RemovalHigh Voltage Transformer Removal Blower Motor RemovalProcedure Control Panel Assembly and Control Unit RemovalHOW to Release the Positive Lock Connector Control Panel Assembly RemovalPower Supply Cord Replacement Re-installAfter adjustment, make sure of the following Choke Cover Removal Door Replacement and AdjustmentDoor Replacement Door AdjustmentRequirement Service InformationPreparation for Testing Microwave MeasurementFigure O-1. Oven SChematic-OFF Condition High Voltage Components C d e CircuitFigure S-3. Printed Wiring Board Cabinet Parts Parts ListParts marked * are used in voltage more than Electric PartsVCEAB31HW104M Door Parts Oven PartsSCRE, Nuts and Washers MiscellaneousDescription HOW to Order Replacement PartsModel Number REF. noOven 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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