Sharp R-24AT, R-22AT service manual Test Procedures Letter Component Test, Power

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R-22AT

R-24AT

TEST PROCEDURES

PROCEDURE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LETTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COMPONENT TEST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Room temperature

 

T0 = 21°C

 

Initial temperature

 

T1 = 11°C

 

Temperature after (28 + 3) = 31 sec [for R-22AT]

 

T2 = 21°C

 

Temperature after (22 + 3) = 25 sec [for R-24AT]

 

T2 = 21°C

 

Temperature difference Cold-Warm

 

∆T1 = 10˚C

 

Measured output power

 

 

 

 

 

 

 

 

The equation is “P = 150 x ∆T” [for R-22AT]

P = 150 x 10°C = 1500 Watts

 

The equation is “P = 190 x ∆T” [for R-24AT]

P = 190 x 10°C = 1900 Watts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

JUDGMENT: The measured output power should be within the range of ± 15 % of the rated output

 

 

power.

 

 

 

 

 

 

 

 

CAUTION: 1°C CORRESPONDS TO 150 WATTS [R-22AT]/ 190 WATTS [R-24AT]. REPEAT

 

MEASUREMENT IF THE POWER IS INSUFFICIENT.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1000g

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1000g

 

 

1000g

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T1˚C

 

 

 

 

T2˚C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Heat up for 31 sec. for R-22AT

Heat up for 25 sec. for R-24AT

MICROWAVE OUTPUT POWER (2000 cc alternative method)

The power output of this oven is rated using the method specified by IEC 60705. Full details of how to curry out this procedure can be found in the Sharp Technical Training notes which is available from Sharp Parts Centre (part number SERV-LITMW01).

The IEC-60705 procedure must be carried out using laboratory-type procedures and equipment. These requirements make the procedure unsuitable for routine performance checks.

NOTE: The following test method gives an indication of the output power only, it cannot be used to establish the actual/rated output power. If the true output power is required, then the IEC60705 test method must be used.

Alternative simplified method:

1.Place 2 litres of cold water (between 12°C and 20°C) in a suitable container.

2.Stir the water and measure the temperature in °C. Note temperature as T1.

3.Place the container in the microwave and heat the water for 56 sec. [R-22AT]/ 44 sec. [R-24AT] on fill power.

4.When the 56 sec. [R-22AT]/ 44 sec. [R-24AT] is completed, remove the container and stir the water. Note temperature as T2.

5.Calculate the output power using the following formula: R.F. Power Output = (T2 - T1) x 150 for R-22AT.

R.F. Power Output = (T2 - T1) x 190 for R-24AT.

NOTE: The result from this test should be within the allowance of 2000cc alternative method. (±10%).

MICROWAVE LEAKAGE TEST

This oven should be tested for microwave leakage on completion of any repair or adjustment, following the procedure described in the Sharp Technical Training notes (part number SERV-LITMW01). The maximum leakage permitted in BS EN 60335-2-25 is 50W/m2 (equivalent to 5W/m2), however it is not normal to detect any significant leakage, therefore, any leakage which is detected should be investigated.

It is essential that only leakage detectors with current calibration traceable to National Physical Laboratories are used.

Suitable leakage detectors: CELTEC A100

APOLLO X1

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Contents Table of Contents Commercial Microwave OvenRemember to Check 3D Remember to Check 4RSharp Corporation OSAKA, Japan Commercial Microwave Oven22AT/ R-24AT General Important InformationSpecification DescriptionThis Appliance Must be Earthed Brown LiveInstallation Information Display and IndicatorsAppearance View Auto Touch Control PanelOperation Sequence Idle ConditionMicrowave Cooking 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 T3Test Procedures Procedure Letter Component Test Magnetron TestMicrowave Output Power 1 litre water load Test Procedures Letter Component Test PowerMicrowave Output Power 2000 cc alternative method High Voltage Rectifier Assembly Test Carry OUT 3D Checks Switch TestCarry OUT 4R Checks Carry OUT 4R ChecksProcedure Letter Component Test Temperature Fuse TF1, TF2, TF3 TestWeak Point F3 Test Carry OUT 3D Checks Fuse F1, F2 F10A Test Carry OUT 3D ChecksTouch Control Panel Assembly Test Motor Winding TestNoise Filter Test High Voltage Fuse F4, F5 Test Carry OUT 3D ChecksKEY Unit Test Relay TestRY1 RY3Occurrence Cause or Correction Touch Control Panel Assembly Description of LSI LSIIXA222DRSignal to sound buzzer Signal synchronized with commercial power source frequencyInternal clock oscillation frequency setting input Power source voltageDigit selection signal Key strobe signalSound Voltage level control terminal Servicing Shapes of Electronic ComponentsServicing of Touch Control Panel Other Precautions Servicing ToolsPAD Order Display Phone Procedure for Entering to Other Checking and Clearing PROCE- Dure forDefrost Precautions for Using LEAD-FREE Solder SET Number Double Quantity Check SignalUsing lead-free wire solder Employing lead-free solderComponent Replacement and Adjustment Procedure Outer CASE, Rear Cabinet and Power Supply Cord RemovalHigh Voltage Transformers Removal Magnetron Thermistor Replacement Re-installMagnetrons Removal RemovalHOW to Release the Positive Lock Connector Terminal Insulator ReplacementBlower Motor Removal Stirrer Motors Upper and Lower RemovalControl Panel Assembly and Control Unit Removal Power Supply Cord ReplacementControl Panel Assembly Removal HOW to Attach Membrane Switch and Graphic SheetDoor Replacement and Adjustment After adjustment, make sure of the followingRemoval Door Disassembly Choke Cover RemovalDoor Components Removal Service Information Upper and Lower Latch Heads RemovalDoor Case Removal Door Glass RemovalProcedure Microwave MeasurementPreparation 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 Parts List Parts marked * are used in voltage more thanElectoric Parts Cabinet PartsOven Parts RH-IXA222DRZZ LSI RH-IXA298DRZZ EepromDoor Parts MiscellaneousSCRE,NUTS and Washers HOW to Order Replacement Parts Packing and AccessoriesModel Number 2. REF. no Description 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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