Sharp R-1505 Operation, Description of Operating Sequence, OFF Condition, Cooking Condition

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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 oven operation.

OFF CONDITION

Closing the door activates the door sensing switch and primary interlock switch. (In this condition, the monitor switch contacts are opened.)

When oven is plugged in, 120 volts A.C. is supplied to the control unit. (Figure O-1).

1.The display will show flashing "88 : 88".

To set any program or set the clock, you must first touch the STOP/CLEAR button. The display will clear, and " : " will appear .

COOKING CONDITION

Program desired cooking time touching the NUMBER pads. When the START button is touched, the following opera- tions occur:

1.The contacts of relays are closed and components connected to the relays are turned on as follows.

(For details, refer to Figure O-2)

RELAY

CONNECTED COMPONENTS

RY1

Oven lamp / Fan motor / Turntable motor

 

 

RY2

Power transformer

 

 

RY3, RY4

Hood fan motor

 

 

RY5, RY6

Hood lamp

2.120 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3.3 volts A.C. output on the filament winding, and approximately 2000 volts A.C. on the high voltage winding.

3.The filament winding voltage heats the magnetron filament and the H.V. winding voltage is sent to a voltage doubler circuit.

4.The microwave energy produced by the magnetron is channelled through the waveguide into the cavity feed- box, and then into the cavity where the food is placed to be cooked.

5.Upon completion of the cooking time, the power transformer, oven lamp, etc. are turned off, and the generation of microwave energy is stopped. The oven will revert to the OFF condition.

6.When the door is opened during a cook cycle, monitor switch, door sensing switch, primary interlock switch, relay (RY1) and secondary interlock relay (RY2) are activated with the following results. The circuits to the cooling fan motor, the turntable motor, and the high voltage components are de-energized, the oven lamp remains on, and the digital read-out displays the time still remaining in the cook cycle when the door was opened.

7.The monitor switch is electrically monitoring the operation of the primary interlock switch and secondary interlock

relay (RY2) and is mechanically associated with the door so that it will function in the following sequence.

(1)When the door opens from a closed position, the secondary interlock relay (RY2) and primary interlock switch open their contacts. And contacts of the relay (RY1) remains closed. Then the monitor switch contacts close.

(2)When the door is closed from the open position, the monitor switch contacts first open, and then the contacts of the primary interlock switch and door sensing switch close. And contacts of the relay (RY1) open.

If the primary interlock switch and secondary interlock relay (RY2) fail with their contacts closed when the door is opened, the closing of the monitor switch contacts will form a short circuit through the monitor fuse, primary interlock switch, relay (RY1) and secondary interlock relay (RY2), causing the monitor fuse to blow.

POWER LEVEL P-0 TO P-90 COOKING

When Variable Cooking Power is programmed, the 120 volts A.C. is supplied to the power transformer intermittently through the contacts of relay (RY2) which is operated by the control unit within an interval second time base. Microwave power operation is as follows:

VARI-MODE

ON TIME

OFF TIME

Power 10(P-HI)

32 sec.

0 sec.

(100% power)

 

 

Power 9(P-90)

30 sec.

2 sec.

(approx. 90% power)

 

Power 8(P-80)

26 sec.

6 sec.

(approx. 80% power)

 

Power 7(P-70)

24 sec.

8 sec.

(approx. 70% power)

 

 

 

 

Power 6(P-60)

22 sec.

10 sec.

(approx. 60% power)

 

 

 

 

Power 5(P-50)

18 sec.

14 sec.

(approx. 50% power)

 

 

 

 

Power 4(P-40)

16 sec.

16 sec.

(approx. 40% power)

 

 

 

 

Power 3(P-30)

12 sec.

20 sec.

(approx. 30% power)

 

 

 

 

Power 2(P-20)

8 sec.

24 sec.

(approx. 20% power)

 

 

 

 

Power 1(P-10)

6 sec.

26 sec.

(approx. 10% power)

 

 

 

 

Power 0(P-0)

0 sec.

32 sec.

(0% power)

 

 

Note: The ON/OFF time ratio does not correspond with the percentage of microwave power, because approx. 3 seconds are needed for heating of the magnetron filament.

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Contents 1506 Table of ContentsBefore Servicing Dont Touch Before Servicing When the testing is completedMicrowave Measurement Procedure RequirementsLeakage test Over the Range Microwave Oven Sharp PLAZA, Mahwah1500/ R-1501/ R-1505/ R-1506 ForewordGeneral Information Product SpecificationDescription Grounding InstructionsOven Diagram Control Panel LevelLight HI/ LO FAN HI/ LO Stop Clear Start Minute Plus Operation Power Level P-0 to P-90 CookingDescription of Operating Sequence OFF ConditionVertical Venting Ventilation Methods HOT AIR ExhaustAIR Flow Horizontal VentingFigure O-1. Oven Schematic-Off Condition Description and Function of Components Troubleshooting Guide Hood FAN MotorHood Lamp Possible Case Defective Parts Test Procedure ProblemProcedure Letter Component Test Magnetron Assembly Test Test ProceduresMicrowave Output Power Power Transformer TestMagnetron Temperature Fuse Test Procedure Letter Component TestHigh Voltage Rectifier Test High Voltage Capacitor TestSecondary Interlock System Test Door Sensing Switch Primary Interlock Switch TestMonitor Switch Test Secondary Interlock Relay RY2Blown Monitor Fuse Test Procedure Component Test LetterHood Thermal CUT-OUT Test Hood FAN Motor TestTouch Control Panel Assembly Test Before testingWHT 3 KEY Unit Test Foil Pattern on the Printed Wiring Board Test Procedure Letter Component Test Relay TestDefrost Center Test 1ST Stage 2ND StageSteps Occurrence Cause or Correction QKITPB035Touch Control Panel Assembly Description of LSILSI Signal synchronized with commercial power source frequency OUT Oven lamp, fan motor and turntable motor driving signalInternal clock oscillation frequency input setting OUT Key strobe signalHood lamp driving signal Key strobe signalHood motor high / low driving signal Hood motor driving signalServicing Other PrecautionsShapes of Electronic Components Servicing of Touch Control PanelHood Exhaust Louver Removal Component Replacement and Adjustment ProcedureRe-install Power Transformer RemovalPictorial Diagram Outer Case RemovalHigh Voltage Rectifier and High Voltage Capacitor Removal Magnetron RemovalHood FAN Thermal CUT-OUT Removal Thermal CUT-OUT Cavity RemovalCooling FAN Motor Removal Temperature Fuse Magnetron RemovalControl Panel ASSEMBLY, Control Unit and KEY Unit Removal Positive Lock Connector NO-CASE Type RemovalPositive lock connector Turntable Motor and Food Lamp Sockets RemovalControl Unit and KEY Unit Removal Key unit locationAfter adjustment, check the following Door ReplacementDoor Assembly Removal Door Assembly RE-INSTALLReplacement Door DisassemblyDoor Frame Assembly Choke CoverHigh Voltage Components Control UnitFigure S-2. Power Unit Circuit Unit CircuitDIP Parts marked * are used in voltage more than Parts ListElectric Parts Cabinet PartsOven Parts Door PartsMiscellaneous Packing and Accessories HOW to Order Replacement PartsSCREWS,NUTS and Washers Model NumberOven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Copyright 2001 by Sharp Corporation ALL Rights Reserved
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R-1506, R-1501, R-1505, R-1500 specifications

The Sharp R-1500, R-1505, R-1501, and R-1506 are part of Sharp's extensive line of microwave ovens, showcasing advanced cooking technologies and user-friendly features that cater to the modern kitchen. These models are designed to provide convenience and efficiency while delivering consistent cooking results.

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