Manuals / Sharp / Kitchen Appliance / Microwave Oven

Sharp service manual Sharp Corporation, Commercial Microwave Oven, MODELS R-22AT, SY520R24ATK

Models: R-22AT R-24AT

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SERVICE MANUAL

R-22AT

R-24AT

SERVICE MANUAL

SY520R24ATK//

COMMERCIAL

MICROWAVE OVEN

1900W/R-24AT

R-24AT

DOUBLE		EXPRESS
QUANTITY		EXPRESS
		DEFROST
		11	1
		12	2
		13	3
		14	4
		15	5
		16	6
		17	7
		18	8
		19	9
		20	0
MANUAL/		STOP / CLEAR
REHEAT		STOP / CLEAR
POWER		START
	LEVEL	START
SET	CHECK VOLUME
	CHECK VOLUME

MODELS R-22AT

R-24AT

In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.

This revised service manual is applied to

R-22AT from serial No. 050505509 and

R-24AT from serial No. 050508658.

Because many parts have been changed to improve quality of these models from May 2005 production.

And the changed parts are not interchangeable. Please use this service manual for above products.

For old products, please use old service manual (No.SX910R24ATK//) and technical reports.

TABLE OF CONTENTS
	Page
SERVICING	INSIDE FRONT COVER
CAUTION, MICROWAVE RADIATION	1
WARNING	1
PRODUCT SPECIFICATIONS	2
GENERAL INFORMATION	2
APPEARANCE VIEW	3
OPERATION SEQUENCE	4
FUNCTION OF IMPORTANT COMPONENTS	6
TROUBLESHOOTING GUIDE	7
TEST PROCEDURE	8
TOUCH CONTROL PANEL ASSEMBLY	16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE	24
MICROWAVE MEASUREMENT	31
WIRING DIAGRAM	32
PICTORIAL DIAGRAM	34
CONTROL PANEL CIRCUIT	35
PRINTED WIRING BOARD	36
PARTS LIST	37

SHARP CORPORATION

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Sharp service manual Sharp Corporation, Commercial Microwave Oven, MODELS R-22AT, Table Of Contents, SY520R24ATK

Contents

SHARP CORPORATION TABLE OF CONTENTSCOMMERCIAL MICROWAVE OVEN MODELS R-22ATSERVICING WARNING TO SERVICE PERSONNELREMEMBER TO CHECK 3D WARNING AGAINST THE CHARGE OF THE TWO HIGH-VOLTAGE CAPACITORSCOMMERCIAL MICROWAVE OVEN R-22AT/ R-24AT SHARP CORPORATION OSAKA, JAPANGENERAL IMPORTANT INFORMATION MICROWAVE RADIATIONDESCRIPTION SPECIFICATIONTHIS APPLIANCE MUST BE EARTHED PRODUCT DESCRIPTIONDISPLAY AND INDICATORS INSTALLATION INFORMATIONAPPEARANCE VIEW AUTO TOUCH CONTROL PANELIDLE CONDITION OPERATION SEQUENCEMICROWAVE COOKING CONDITION MICROWAVE VARIABLE COOKINGFigure B-1. High Voltage Circuit TWO MAGNETRON OPERATION SYSTEMFigure B-2. Operation of Magnetron MONITOR SWITCHES SW3, SW4 INTERLOCK SWITCHES SW1, SW2 AND STOP SWITCH SW5MAGNETRON TEMPERATURE FUSES TF1, TF2 EXHAUST TEMPERATURE FUSE TF3EXHAUST OVEN THERMISTOR TH3 TROUBLESHOOTING GUIDEMAGNETRON THERMISTORS TH1, TH2 BLOWER MOTOR BMPOSSIBLE CAUSE AND DEFECTIVE PARTS TESTPROCEDUREPROCEDURE TEST PROCEDURESMICROWAVE OUTPUT POWER 1 litre water load LETTERMICROWAVE OUTPUT POWER 2000 cc alternative method powerTEST PROCEDURES PROCEDUREE SWITCH TEST C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST CARRY OUT 3D CHECKSB HIGH VOLTAGE TRANSFORMER TEST CARRY OUT 4R CHECKSH TEMPERATURE FUSE TF1, TF2, TF3 TEST CAUTION Only replace weak point F3 with the correct value replacementF WEAK POINT F3 TEST CARRY OUT 3D CHECKS G FUSE F1, F2 F10A TEST CARRY OUT 3D CHECKS3. CARRY OUT 4R CHECKS M TOUCH CONTROL PANEL ASSEMBLY TESTJ MOTOR WINDING TEST K NOISE FILTER TESTO RELAY TEST N KEY UNIT TESTTEST PROCEDURES PROCEDUREPROCEDURE TEST PROCEDURESLETTER COMPONENT TEST1 Power Supply Circuit TOUCH CONTROL PANEL ASSEMBLY2 Reset Circuit 11 Stop Switch CircuitPower source voltage GND SignalTemperature measurement input EXHAUST THERMISTOR Temperature measurement input MAGNETRON THERMISTOR TH2Signal synchronized with commercial power source frequency Signal to sound buzzerInternal clock oscillation frequency setting input Power source voltageKey strobe signal Digit selection signalSound Voltage level control terminal Signal2-2 Memory IC Figure T-2. Relation between Pin Nos, and SignalsSERVICING 2. Shapes of Electronic Components5. Other Precautions PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN4. Servicing Tools OTHER CHECKING AND CLEARING PROCE- DURE FOR PROCEDURE FOR ENTERING TO2. Using lead-free wire solder PRECAUTIONS FOR USING LEAD-FREE SOLDER1. Employing lead-free solder 3. SolderingOUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREprecautions To remove rear cabinet and power supply cordASSEMBLY REMOVAL MAGNETRON THERMISTOR REPLACEMENTRe-install Figure C-1. Magnetron thermistor installationTERMINAL INSULATOR REPLACEMENT HOW TO RELEASE THE POSITIVE LOCK CONNECTORProcedure Figure C-2. How to release the positive lock connectorPOWER SUPPLY CORD REPLACEMENT CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVALCONTROL PANEL ASSEMBLY REMOVAL HOW TO ATTACH MEMBRANE SWITCH AND GRAPHIC SHEETINTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH ADJUSTMENT INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH REMOVALDOOR REPLACEMENT AND ADJUSTMENT Figure C-4. Power supply cord replacementRE-INSTALL DOOR DISASSEMBLYNote After any service to the door DOOR ADJUSTMENTUPPER AND LOWER LATCH HEADS REMOVAL SERVICE INFORMATIONDOOR CASE REMOVAL DOOR GLASS REMOVALMICROWAVE MEASUREMENT PROCEDUREPREPARATION Figure O-2 Oven Schematic-IDLE Condition Door opened condition Figure O-1 Oven Schematic-OFF ConditionSCHEMATIC NOTE CONDITION OF OVEN SCHEMATIC NOTE CONDITION OF OVEN 1. FOR 1MINUTE AFTER DOOR CLOSEDSCHEMATIC NOTE CONDITION OF OVEN 1. DOOR CLOSED Figure O-3 Oven Schematic-Cooking Condition2. MANUAL REPEAT KEY TOUCHED 3. COOKING TIME PROGREMMED 4. START PAD TOUCHEDCOMPONENTS Figure S-1. Pictrorial DiagramA B C VOLTAGEControl2 PanelCircuitBLACK 2.5A FUSE Figure S-3. Printed Wiring BoardA B C D E F G H A B C D ENote The parts marked ∆ may cause undue microwave exposure PARTS LISTThe parts marked * are used in voltage more than ELECTORIC PARTSREF. NO OVEN PARTSDESCRIPTION CODEMISCELLANEOUS DOOR PARTSSCRE,NUTS AND WASHERS REF. NOHOW TO ORDER REPLACEMENT PARTS PACKING AND ACCESSORIES1. MODEL NUMBER 2. REF. NO 4. DESCRIPTIONF G H OVEN AND CABINET PARTSA2 A1 DOOR PARTS CONTROL PANEL PARTSMISCELLANEOUS 3-2-2 3-2-3