Sharp R-2397 Min Cx ± 20% Cy ± 20% 5mH, Touch Control Panel Assembly Test, KEY Unit Test

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R-2397

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

N F1

L

WHT

L Cx

L

Cy BLK

L (min)

Cx ± 20%

Cy ± 20%

 

 

 

0.5mH

0.22 μF

4700 pF

MEASURING POINT

INDICATION OF OHMMETER

 

 

Between N and L

Open circuit

Between terminal N and WHITW

Short circuit

Between terminal L and BLK

Short circuit

If incorrect readings are absorbed, replace the noise filter.

CARRY OUT 4R CHECKS.

NTOUCH CONTROL PANEL ASSEMBLY TEST

The touch control panel consists of circuits including semiconductors such as LSI, IC, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two units, Control Unit and Switch Unit, troubleshooting by unit replacement is described according to the symptoms indicated.

1.Key Unit

The following symptoms indicate a defective key unit. Replace the key unit.

a)When touching the pads, a certain pad produces no signal at all.

b)When touching the pads, sometimes a pad produces no signal.

2.Control Unit

The following symptoms may indicate a defective control unit. Replacing the control unit.

2-1 Programming problems.

a)When touching the pads, a certain group of pads do not produce a signal. 2-2 Display problems.

a)For a certain digit, all or some segments do not light up.

b)For a certain digit, brightness is low.

c)Only one indicator does not light.

d)The corresponding segments of all digits do not light up; or they continue to light up.

e)Wrong figure appears.

f)A certain group of indicators do not light up.

g)The figure of all digits flicker.

2-3 Other possible problems caused by defective control unit.

a)Buzzer does not sound or continues to sound.

b)Cooking is not possible.

Note: When defective components, (the Control Unit or Key Unit) are replaed, the defective part or parts must be properly packed for return in the shipping carton. with its cushion material, in which the new replacement part was shipped to you.

OKEY UNIT TEST

f the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is making good contact, verify that the door sensing switch (stop switch ) operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the door sensing switch (stop switch ) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the stop switch connector ). Use the key unit matrix indicated on the control panel schematic and place a jumper

wire between the pins that corre-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

spond to the STOP/CLEAR pad

 

 

 

 

G 8

 

 

G 7

 

 

G 6

 

 

G 5

 

 

G 4

 

 

G 3

 

G 2

 

 

G 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

making momentary contact. If the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G 9

 

 

 

 

 

 

 

 

 

 

X2

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

 

control unit responds by clearing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

with a beep, the key unit is faulty

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

 

 

 

 

G 10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and must be replaced. If the con-

 

 

 

 

 

 

 

1

 

3

 

5

 

9

 

 

 

 

 

 

 

 

 

 

 

G 11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

trol unit does not respond, it is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

faulty and must be replaced.

 

 

 

 

 

2

 

4

 

6

 

0

 

 

 

 

 

 

 

 

 

 

 

G 12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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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 TestKEY Unit Test Touch Control Panel Assembly TestMin Cx ± 20% Cy ± 20% 5mH 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 ProcedureAfter adjustment, make sure of the following Power Supply Cord ReplacementRe-install 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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