Sharp R-24AT, R-22AT Procedure Letter Component Test, Weak Point F3 Test Carry OUT 3D Checks

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R-22AT

R-24AT

 

TEST PROCEDURES

PROCEDURE

 

LETTER

COMPONENT TEST

Table: Terminal Connection of Switch

Plunger Operation

COM to NO

COM to NC

Released

Open circuit

Short circuit

Depressed

Short circuit

Open circuit

COM;

Common terminal,

NO;

Normally open terminal

NC;

Normally close terminal

If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.

CARRY OUT 4R CHECKS.

FWEAK POINT F3 TEST CARRY OUT 3D CHECKS.

If the weak point F3 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 F3 with the correct value replacement.

GFUSE F1, F2 F10A TEST CARRY OUT 3D CHECKS.

If the fuse F1 F10A (or F2 F10A) is blown when the door is opened, check the interlock switch SW1 (or SW2) and monitor switch SW3 (or SW4).

If thefuse F1 F10A (or F2 F10A) is blown by incorrect door switching replace the defective switch(s) and the fuse F1 F10A (or F2 F10A).

CARRY OUT 4R CHECKS.

CAUTION: Only replace fuse F1 F10A (or F2 F10A) with the correct value replacement.

HTEMPERATURE FUSE TF1, TF2, TF3 TEST

1.CARRY OUT 3D CHECKS.

2.A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the temperature fuse reaches specfied temperature as shown below.

 

 

Open

Close

Display or

 

 

 

temperature

temperature

Condition

Check point

Magnetron

tem -

 

 

EE1

Magnetron MG1 Failure:

perature fuse (Up-

 

 

Test magnetron MG1 and Blower motor.

 

 

 

per) TF1

 

 

Non resetable

 

 

 

150˚C

EE3

Magnetron MG1, MG2 Failure: Test magnetron MG1,

 

 

Magnetron

tem -

type

MG2. Check blower motor and ventilation opening.

 

 

 

 

p e r a t u r e

f u s e

 

 

EE2

Magnetron MG2 Failure:

(Lower) TF2

 

 

 

Test magnetron MG2 and Blower motor.

 

 

 

 

 

Exhaust tempera-

120˚C

Non resetable

Oven shut

Food has been burned in oven.

ture fuse TF3

 

 

type

off

Temperature of oven inside is very high.

3. CARRY OUT 4R CHECKS.

CAUTION: IF THE temperature fuse INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE temperature fuse.

ITHERMISTOR TH1, TH2, TH3 TEST

1.CARRY OUT 3D CHECKS.

2.Follow the procedures below for each thermistor.

2-1. THERMISTOR TEST

Disconnect the connector of the thermistor from the switch harness. Measure the resistance of the magnetron thermistor with an ohmmeter. Connect the ohmmeter leads to the leads of the thermistor.

Resistance:

Approx. 500 kΩ -- 1 MΩ

12

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Contents Table of Contents Commercial Microwave OvenRemember to Check 3D Remember to Check 4R22AT/ R-24AT Sharp Corporation OSAKA, JapanCommercial Microwave Oven General Important InformationThis Appliance Must be Earthed SpecificationDescription Brown LiveAppearance View Installation InformationDisplay and Indicators Auto Touch Control PanelMicrowave Cooking Condition Operation SequenceIdle Condition Microwave Variable CookingTWO Magnetron Operation System Figure B-1. High Voltage CircuitFunction of Important Components Troubleshooting Guide Possible Cause and Defective Parts EEP ROM KEY Unit Touch Control Transformer T3Microwave Output Power 1 litre water load Test ProceduresProcedure Letter Component Test Magnetron Test Microwave Output Power 2000 cc alternative method Test Procedures Letter Component TestPower Carry OUT 4R Checks High Voltage Rectifier Assembly Test Carry OUT 3D ChecksSwitch Test Carry OUT 4R ChecksWeak Point F3 Test Carry OUT 3D Checks Procedure Letter Component TestTemperature Fuse TF1, TF2, TF3 Test Fuse F1, F2 F10A Test Carry OUT 3D ChecksNoise Filter Test Touch Control Panel Assembly TestMotor Winding Test High Voltage Fuse F4, F5 Test Carry OUT 3D ChecksRY1 KEY Unit TestRelay Test RY3Occurrence Cause or Correction Touch Control Panel Assembly Description of LSI LSIIXA222DRInternal clock oscillation frequency setting input Signal to sound buzzerSignal synchronized with commercial power source frequency Power source voltageSound Voltage level control terminal Digit selection signalKey strobe signal Servicing of Touch Control Panel ServicingShapes of Electronic Components PAD Order Display Phone Other PrecautionsServicing Tools Defrost Procedure for Entering toOther Checking and Clearing PROCE- Dure for Using lead-free wire solder Precautions for Using LEAD-FREE SolderSET Number Double Quantity Check Signal Employing lead-free solderHigh Voltage Transformers Removal Component Replacement and Adjustment ProcedureOuter CASE, Rear Cabinet and Power Supply Cord Removal Magnetrons Removal Magnetron Thermistor ReplacementRe-install RemovalBlower Motor Removal HOW to Release the Positive Lock ConnectorTerminal Insulator Replacement Stirrer Motors Upper and Lower RemovalControl Panel Assembly Removal Control Panel Assembly and Control Unit RemovalPower Supply Cord Replacement HOW to Attach Membrane Switch and Graphic SheetRemoval Door Replacement and AdjustmentAfter adjustment, make sure of the following Door Components Removal Door DisassemblyChoke Cover Removal Door Case Removal Service InformationUpper and Lower Latch Heads Removal Door Glass RemovalPreparation ProcedureMicrowave Measurement Figure O-1 Oven Schematic-OFF Condition Figure O-3 Oven Schematic-Cooking Condition Figure S-1. Pictrorial Diagram PanelCircuit DG1Figure S-3. Printed Wiring Board Electoric Parts Parts ListParts marked * are used in voltage more than Cabinet PartsOven Parts RH-IXA222DRZZ LSI RH-IXA298DRZZ EepromSCRE,NUTS and Washers Door PartsMiscellaneous Model Number 2. REF. no Description HOW to Order Replacement PartsPacking and Accessories Oven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous
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R-22AT, R-24AT specifications

The Sharp R-24AT and R-22AT microwave ovens are advanced kitchen appliances designed to enhance cooking convenience, efficiency, and versatility. Both models incorporate innovative technologies and features that cater to modern cooking needs.

The Sharp R-24AT boasts a robust 900 watts of cooking power, enabling users to prepare a wide variety of meals quickly and effectively. Its spacious 24-liter capacity is suitable for families and those who enjoy entertaining. One of the standout features of the R-24AT is its intelligent sensor technology, which automatically detects humidity levels in the cooking food. This innovative feature ensures optimal cooking times and temperatures, resulting in perfectly cooked dishes without the guesswork.

Another key technology in the R-24AT is the inverter cooking system. This system provides a seamless flow of power throughout the cooking process, allowing for more precise temperature control. Unlike traditional microwaves that operate in full power or off, inverter technology ensures consistent heat, which is particularly beneficial for tasks such as defrosting, reheating, and simmering.

The Sharp R-22AT, while slightly more compact with a 22-liter capacity, also delivers impressive performance with 800 watts of power. It features a similar inverter cooking system that guarantees even cooking results. Both models come with multiple auto-cook presets, providing users with a selection of quick options for common dishes such as popcorn, pizza, and oatmeal. This feature streamlines meal preparation and reduces the time spent on planning meals.

In addition, the user-friendly control panel on both models includes a combination of push-button and rotary dial controls for easy navigation. The inclusion of a bright LED display further enhances usability, allowing cooks to monitor cooking times and settings easily.

Safety is another critical aspect of the Sharp R-24AT and R-22AT. Both models come equipped with a child lock feature, ensuring peace of mind in homes with young children. The stainless steel interiors of these microwaves facilitate easy cleaning, while their sleek design adds a modern touch to any kitchen.

In summary, the Sharp R-24AT and R-22AT microwave ovens stand out for their advanced cooking technologies, user-friendly features, and thoughtful design. They empower home cooks to prepare meals with precision and ease, making them a valuable addition to any kitchen.
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