Sharp R-1505 Procedure Letter Component Test Relay Test, Defrost Center Test, 1ST Stage 2ND Stage

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R-1500

R-1501

R-1505

R-1506

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

NRELAY TEST

1.Disconnect the power supply cord, and then remove outer case. Refer to procedure of " HOOD EXHAUST LOUVER REMOVAL ", " REMOVAL OF OVEN FROM WALL " and " OUTER CASE REMOVAL ".

2.Open the door and block it open.

3.To discharge high voltage capacitor, wait for 60 seconds.

4.Remove the hood intake duct R.

5.Disconnect the leads to the primary of the power transformer.

6.Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

7.After that procedure, re-connect the power supply cord.

8.Check voltage between normal open terminal of the relay RY2 and the normal open terminal of the relay RY1 on the control unit with an A.C. voltmeter.

The meter should indicate 120 volts, if not check oven circuit.

RY1, RY2, RY3, RY4, RY5 and RY6 Relay Test These relays are operated by D.C. voltage

Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation. DC. voltage indicated ....................Defective relay.

DC. voltage not indicated .............. Check diode which is connected to the relay coil. If diode

is good, control unit is defective.

RELAY SYMBOL

OPERATIONAL VOLTAGE

CONNECTED COMPONENTS

RY1

Approx. 26.6V D.C.

Oven lamp / Fan motor / Turntable motor

RY2(COOK)

Approx. 26.0V D.C.

Power transformer

RY3

Approx. 26.6V D.C.

Hood motor

RY4

Approx. 26.6V D.C.

Hood motor

RY5

Approx. 26.6V D.C.

Hood lamp

RY6

Approx. 26.6V D.C.

Hood lamp

 

 

 

9.Disconnect the power supply cord.

10.Open the door and block it open.

11.To discharge high voltage capacitor, wait for 60 seconds.

12.Reconnect all leads removed from components during testing.

13.Re-install the hood intake duct R.

14.Re-install the outer case (cabinet).

15.Reconnect the power supply cord after the outer case is installed.

16.Run the oven and check all functions.

O

DEFROST CENTER TEST

 

 

 

 

 

(1)

Open the door.

 

 

 

 

 

(2)

Place one cup of water in the center of the turntable tray in the oven cavity.

 

(3)

Touch the " STEAKS/CHOPS " pad once.

 

 

 

(4)

Close the door.

 

 

 

 

 

(5)

Touch the " START " button.

 

 

 

 

(6)

The oven is in Defrost center cooking condition.

 

(7)

The oven will operate as follows.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Menu

1ST STAGE

2ND STAGE

 

 

 

 

Steaks/Chops

LEVEL

TIME

LEVEL

TIME

 

 

 

 

 

 

 

 

 

 

 

 

 

0.5lbs

60%

57sec.

40%

17sec.

 

 

 

 

 

 

 

 

 

 

 

(8)

If improper operation is indicated, the control unit is probably defective and should be checked.

 

 

 

 

 

 

 

 

P

FOIL PATTERN ON THE PRINTED WIRING BOARD TEST

 

To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on

 

the PWB, this foil pattern acts as a fuse.

 

 

19

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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

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