Sharp R-2397 service manual Function of Important Components

Page 7

T2: HIGH VOLTAGE TRANSFORMER

(FRONT)

ASYMMETRIC RECTIFIER

C2: H.V. CAPACITOR

H. V. RECTIFIER

 

T1: HIGH VOLTAGE TRANSFORMER

(REAR)

ASYMMETRIC RECTIFIER

C1: H.V. CAPACITOR

H. V. RECTIFIER

 

COMMERCIAL FREQUENCY (50HZ)

POWER OUTPUT BY MAGNETRON 1

POWER OUTPUT BY MAGNETRON 2

R-2397

OPERATION OF MAGNETRON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MG2: MAGNETRON (LOWER)

MG1: MAGNETRON (UPPER)

 

 

 

 

 

 

 

 

Figure B-1. High Voltage Circuit

Figure B-2. Operation of Magnetron

FUNCTION OF IMPORTANT COMPONENTS

DOOR OPEN MECHANISM

1.The door release lever is pulled.

2.The upper latch head is lifted up by the linked door release lever.

3.The latch lever is lifted up by the door release lever.

4.The joint lever is lifted up by the latch lever.

5.The lower latch head is lifted up by the joint lever.

6.Now both latch heads are lifted up, so they can be released from the latch hook.

7.Now the door can be opened.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) the upper latch head and switch lever A while the door is closed. The switch is intended to render the oven inopera- tive by means of blowing the fuse F6.3A when the contacts of the 1st latch switch fail to open when the door is opened.

Function

1. When the door is opened, the monitor switch contacts

close (to the ON condition) due to their being normally

closed. At this time the 1st latch switch is in the OFF

Door release lever

Joint lever

Latch head

Latch head

Monitor switch

Latch hook

2nd. latch switch

1st. latch switch

Stop switch

3rd. latch switch

 

condition (contacts open) due to their being normally

 

open contact switches.

2.

As the door goes to a closed position, the monitor

 

switch contacts are opened and 1st latch switch con-

 

tacts are closed (On opening the door, each of these

 

switches operate inversely.)

3.

If the door is opened and the 1st latch switch contacts

 

fail to open, the fuse F6.3A blows simultaneously with

 

closing of the monitor switch contacts.

CAUTION:BEFORE REPLACING A BLOWN FUSE F6.3A TEST THE 1ST LATCH SWITCH, MONITOR SWITCH AND MONITOR RESIS- TOR FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).

MONITOR RESISTOR

The monitor resistor prevents the fuse F6.3A 250V burst- ing when the fuse F6.3A 250V blows due to the operation of the monitor switch.

Figure D-1. Door Open Mechanism

1ST LATCH SWITCH, 2ND LATCH SWITCH, 3RD LATCH SWITCH AND STOP SWITCH

1.When the oven door is closed, the contacts COM-NO must be closed.

2.When the oven door is opened, the contacts COM-NO must be opened.

NOISE FILTER

The noise filter assembly prevents radio frequency inter- ference that might flow back in the power circuit.

WEAK POINT

If the wire harness or electrical components make a short- circuit, this weak point blows to prevent an electric shock or fire hazard.

5

Page 6 Page 8
Image 7
Page 6 Page 8
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 TestMin Cx ± 20% Cy ± 20% 5mH Touch Control Panel Assembly TestKEY 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 RemovalRe-install Power Supply Cord ReplacementAfter 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.
Top Page Image Contents