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

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Sharp R-2397 service manual Function of Important Components
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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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