Sharp R-2397 service manual Sound Voltage level control terminal

Page 22

R-2397

Pin No.

Signal

I/O

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

46

P10

OUT

Segment data signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal similar to P17.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

47-48

P07-P06

OUT

Segment data signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal similar to P17.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

49

P05

OUT

Digit selection signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

The relation between digit signal and digit are as ß(50Hz)

 

 

 

 

 

 

 

 

 

 

L

 

 

 

follows:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Digit signal

Digit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P05

1st.

 

 

 

 

 

P05

 

 

 

 

 

 

 

 

 

 

 

-31(V)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P04

2nd.

 

 

 

 

 

P04

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P03

3rd.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P02

4th.

 

 

 

 

 

P03

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P01

5th.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P00

6th.

 

 

 

 

 

P02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normally, one pulse is output in every ß period,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

and input to the grid of the Fluorescent Display.

P00

 

 

 

 

 

 

 

 

 

 

-31(V)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50-54

P04-P00

OUT

Digit selection signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal similar to P16.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

55-57

P27-P25

OUT

Terminal not used.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

58-59

P24-P23

OUT

Segment data signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Signal similar to P17.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

P22

OUT

(Sound) Voltage level control terminal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This terminal (P22) is to control volume level of buzzer sound with terminals P21. Since

 

 

 

the volume level of buzzer sound depends on voltage energized, it is control level in 3

 

 

 

steps by combining signal levels for P22,P21. Relationship of signal level combination to

 

 

 

sound volume level is shown in the following table, 1~3 in the table, however, are indicated

 

 

 

in the descending order from the maximum level of sound volume through the minimum

 

 

 

level.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sound Volume

 

P21

P22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,(Max.)

 

 

L

L

 

 

 

 

 

 

 

 

 

 

A A : 1,(Max) 20V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2,

 

 

13V

 

 

 

 

2,

 

 

H

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3,(Min)

7V

 

 

 

 

3,(Min.)

 

 

L

H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*At Output terminal P32, rectangular wave signal of 2.5kHz is output.

 

61

P21

OUT

Sound level control signal.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to above signal P22.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

62

P20

IN

Input signal which communicates the door open/close information to LSI.

 

 

 

Door closed; "H" level signal(0V).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Door opened; "L" level signal(-31.0V).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

63/64

AVCC/VCC

IN

Connected to GND.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2-2 Memory IC (IC2)

AT24C04 is a 4K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with 512 registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal for IC2 are as shown in the following diagram.

FUNCTIONAL DIAGRAM

 

 

TOP VIEW

 

 

 

 

 

 

 

 

 

A0

 

1

8

 

2

7

A1

 

A2

 

3

6

 

VSS

 

4

5

 

 

 

 

 

VCC

TEST

SCL

SDA

(3) Vcc

 

 

 

 

 

(4) Vss

 

 

START CYCLE

H.V. GENERATION

 

 

 

 

TIMING

 

 

 

 

 

& CONTROL

 

(5) SDA

START

 

 

 

 

 

STOP

 

 

 

 

 

LOGIC

 

 

 

 

 

CONTROL

 

 

 

 

LOGIC

 

E 2PROM

 

 

 

 

64

 

 

SLAVE ADDRESS

 

512 x 8

 

 

 

XDEC

 

(6) SCL

REGISTER

 

 

 

 

COMPARATOR

 

 

 

 

 

LOAD

INC

 

 

 

 

WORD

 

 

 

 

 

ADDRESS

 

1

64

 

 

COUNTER

 

5

 

 

 

 

 

 

 

R/W

 

3

YDEC

 

 

 

 

 

 

 

 

CK

8

 

 

PIN

 

Dout

 

 

DATA REGISTER

 

 

 

 

 

 

Dout

 

 

 

 

 

ACK

 

 

 

 

Figure T-4 Relation between Pin Nos, and Signals

20

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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 TestMin Cx ± 20% Cy ± 20% 5mH Touch Control Panel Assembly TestKEY 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 ProcedureRe-install Power Supply Cord ReplacementAfter 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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