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R-1500
R-1501
R-1505
R-1506
SERVICE MANUAL
S8123R1500X//
OVER THE RANGE
MICROWAVE OVEN
MODELS
R-1500
R-1501
R-1505
R-1506
In the interest of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
tain circuitry capable of producing very high voltage and
current. Contact with the following parts may result in a
severe, possibly fatal, electrical shock. (High Voltage Capaci-
t
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R-1500 R-1501 R-1505 R-1506 PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPO- SURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or
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R-1500 R-1501 R-1505 R-1506 WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harness etc.. Read the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage When the testing is complete
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R-1500 R-1501 R-1505 R-1506 MICROWAVE MEASUREMENT PROCEDURE A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven 2 should not exceed 1mW/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition 2 by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm at any point 5cm or more from the external surface of the oven. 2) Safety interlock switches: Primary i
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R-1500 R-1501 R-1505 R-1506 SERVICE MANUAL PRODUCT DESCRIPTION OVER THE RANGE MICROWAVE OVEN R-1500/ R-1501/ R-1505/ R-1506 GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. OPERATION Service Personnel with Operation and Service Information for the SHARP OVER THE RANGE MICROWAVE OVEN, R-1500, R-1501 R-1505 and R-1506. TROUBLESHOOTING GUIDE AND It is recommended that service personnel carefully study the entire TEST PROCEDURE text of this manual so tha
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R-1500 R-1501 R-1505 R-1506 PRODUCT SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 29-15/16" Height 16-1/4" Depth 15- 9/16" Cooking Cavity Dimensions Width 17-1/2" Height 9-7/8" 1.5 Cubic Feet Depth 14-15/16" Hood lamp 2 bulbs, 20W x 2, Incandescent light bulbs Hood fan Approx. 300 C.F.M. Control Complement Touch Control System Clock
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R-1500 R-1501 R-1505 R-1506 Electrical Requirements The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG. The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more dedicated line, using a grounded receptacle. The receptacle should be located inside the cabinet directly above the Microwave Oven/Hood system mounting location. 3-Pronged Plug Grounded Receptacle Box Grounding Pin 3-Pr
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R-1500 R-1501 R-1505 R-1506 CONTROL PANEL 1000 WATTS NO. LBS. CUPS OZ. COOK DEFROST KEEP HOT POPCORN WARM WATER REHEAT CENTER 1 Casserole 5 Dinner Plate 2 Soup 6 Fresh Rolls / Muffins 3 Pizza 7 Frozen Rolls / Muffins 4 Beverage 8 Canned Vegetables LIGHT HI/ LO COOK CENTER BAKED RICE POTATOES FAN HI/ LO FROZEN FRESH VEGETABLES VEGETABLES GROUND FROZEN MEAT ENTREES STOP CLEAR DEFROST CENTER GROUND STEAKS/ MEAT CHOPS POULTRY POULTRY START BONELESS BONE-IN MINUTE PLUS 1 2 3 4 5 6 7 8 9 TIMER POWER
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R-1500 R-1501 R-1505 R-1506 OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during relay (RY2) and is mechanically associated with the door oven operation. so that it will function in the following sequence. (1) When the door opens from a closed position, the OFF CONDITION secondary interlock relay (RY2) and primary interlock Closing the door activates the door sensing switch and switch open their contacts. And contacts of the relay primary inter
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R-1500 R-1501 R-1505 R-1506 VENTILATION METHODS HOT AIR EXHAUST 1. VERTICAL VENTING For this venting method, hot air rising from the conventional range below is drawn in by the hood fan motor through the grease filters at the right and left sides of the base cover, up through the right and left sides of the oven cavity, then discharged vertically at rear center top of the oven, into the customer's vent system. : AIR FLOW To Duct To Duct Hood Fan Motor Hood Intake Duct R Grease Filter 2. HORIZ
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R-1500 R-1501 R-1505 R-1506 SCHEMATIC NOTE: " " indicates components with potential above 250V. NOTE: CONDITION OF OVEN 1. DOOR CLOSED. CAVITY MAGNETRON 2. CLOCK APPEARS ON DISPLAY. THERMAL CUT-OUT TEMPERATURE FUSE CONTROL UNIT N.O. COM. E2 FUSE 20A A5 RY4 DOOR POWER SENSING TRANSFORMER SWITCH B5 RY6 RY3 E1 HOOD FAN RY2 THERMAL High CUT OUT SECONDARY B7 N.C. INTERLOCK OVEN LAMP GRN RELAY RELAY B9 Low RY1 HOOD GND RY5 120 V AC. CAPACITOR 60 Hz HIGH VOLTAGE HOOD N.O. COM. A1 A3 B1 B3 CAPACIT
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R-1500 R-1501 R-1505 R-1506 DESCRIPTION AND FUNCTION OF COMPONENTS 3. If the door is opened, and the secondary interlock relay DOOR OPEN MECHANISM (RY2) and primary interlock switch contacts fail to open, The door is opened by pushing the open button on the the monitor fuse blows simultaneously with closing of the control panel, refer to the Figure D-1. monitor switch contacts. When the open button is pushed, the open button pushes up CAUTION: BEFORE REPLACING A BLOWN MONITOR the open lever, and
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R-1500 R-1501 R-1505 R-1506 is channelled through the oven cavity to remove steam and This air is then expelled either vertically or horizontally vapors given off from the heating foods. It is then exhausted through the customer supplied duct system, or discharged through the exhausting air vents at the oven cavity. back into the kitchen. HOOD FAN MOTOR HOOD LAMP The hood fan motor is a two-speed, single-phase, double The hood lamps are mounted at the hood lamp angle on the pole induction type,
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R-1500 R-1501 R-1505 R-1506 CK = Check / RE = Replace CK LOW VOLTAGE CK NO POWER AT OUTLET RE SHORT IN POWER CORD CK OPENED OR SHORTED WIRING CK HOOD MOTOR CAPACITOR RE HOOD LAMP OR SOCKET RE TURNTABLE MOTOR RE FAN MOTOR RE OVEN LAMP OR SOCKET P FOIL PATERN ON P.W.B. O DEFROST CENTER N RELAYS (RY-5), (TY6) N RELAY (RY-4) N RELAY (RY-3) N RELAY (RY-2) N RELAY (RY-1) M KEY UNIT L CONTROL UNIT K HOOD FAN MOTOR J HOOD HERMAL CUT-OUT I MONITOR FUSE H MONITOR SWITCH G SECONDARY INTERLOCK SYSTEM F
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R-1500 R-1501 R-1505 R-1506 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER A MAGNETRON ASSEMBLY TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm. 5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron f
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R-1500 R-1501 R-1505 R-1506 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) C HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe,
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R-1500 R-1501 R-1505 R-1506 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. CAUTION: IF THE THERMAL CUT-OUT OR TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT OR TEMPERATURE FUSE. F PRIMARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it ope
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R-1500 R-1501 R-1505 R-1506 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit. 5. Reconnect all leads removed from components during test
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R-1500 R-1501 R-1505 R-1506 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Resistance between; YLW BLU BLU (1) AND YLW (4) = 0Ω (Shorted) 4 1 BLK (2) AND YLW (4) = 33Ω HOOD FAN BLU (1) AND BLK (2) = 33Ω CAPACITOR BLK (2) AND WHT (3) = 11Ω 33 Ω WHT (3) AND RED (5) = 22Ω 22 Ω 11 Ω 5 2 6-PIN CONNECTOR BLU BLK WHT BLK RED OF HOOD FAN MOTOR 1 2 3 3 WHT 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet). 4 5 7. Reconnect the power supply cord after th
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R-1500 R-1501 R-1505 R-1506 TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 8) Run the oven and check all functions. 2. Control Unit. The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure M) to determine if control unit is faulty. 2-1 In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal. b) When touching the pads, no pads produce a signal. 2-2 In connection with indicators
