Sharp R-370EK Service Manual

R-370EKR-370ESIn the interest of user-safety the oven should be restored to itsoriginal condition and only parts identical to those specified shouldbe

8R-370EKR-370ESFigure O-1. Oven Schematic-Off ConditionSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED2. CLOCK APPEARS ON DISPLAY120V AC60 HzOVENLAMPAH

9R-370EKR-370ESDESCRIPTION AND FUNCTION OF COMPONENTSDOOR OPEN MECHANISMThe door is opened by pulling the door. Refer to the FigureD-1.Figure D-1. Doo

10R-370EKR-370ESTROUBLESHOOTING GUIDENever touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.Whe

11R-370EKR-370ESHome fuse or circuit breaker blowswhen power cord is plugged into wallreceptacle.Monitor fuse blows when power cordis plugged into wal

12R-370EKR-370ESB POWER TRANSFORMER TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharg

13R-370EKR-370ESTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block

14R-370EKR-370ESTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block

15R-370EKR-370ESH BLOWN MONITOR FUSE TESTTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2

16R-370EKR-370ESIf the Key unit is defective, replace the key unit.2. Control UnitThe following symptoms indicate a defective control unit. Before rep

17R-370EKR-370ESWARNING : The oven should be fully assembled before following procedure.(1) Place one cup of water in the center of the turntable tray

R-370EKR-370ESPRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLEEXPOSURE TO EXCESSIVE MICROWAVEENERGY(a) Do not operate or allow

18R-370EKR-370ESTEST PROCEDURESPROCEDURELETTERCOMPONENT TESTSTEPS OCCURRENCE CAUSE OR CORRECTION1 Only pattern at "a" is broken. *Insert jum

19R-370EKR-370ESTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wi

20R-370EKR-370ES(8) After that procedure, re-connect the power supply cord.(9) Check the sensor cook operation proceed as follows:9-1. Touch the KITCH

21R-370EKR-370ESTOUCH CONTROL PANEL ASSEMBLYOUTLINE OF TOUCH CONTROL PANELThe control unit section consists of the following units.(1) Key Unit(2) Con

22R-370EKR-370ES9 AN1 IN AH sensor input.This input is an analog input terminal from the AH sensor circuit, and connected to theA/D converter built in

23R-370EKR-370ES31 XOUT OUT Internal clock oscillation frequency control output.Output to control oscillation input of XIN.32 VSS IN Power source volt

24R-370EKR-370ES1) Structure of Absolute Humidity SensorThe absolute humidity sensor includes two thermistorsas shown in the illustration. One thermis

25R-370EKR-370ES1. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of thecircuits. When handling these part

26R-370EKR-370ESTo remove the outer case, proceed as follows.1. Disconnect the power supply cord.2. Open the oven door and block it open.3. To dischar

27R-370EKR-370ESPOWER TRANSFORMER REMOVALReinstallation1. Rest transformer on the base plate with its primaryterminals toward the left side.2.Secure t

1R-370EKR-370ESWARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of pro-ducing very high voltage and current, contact withfollowin

28R-370EKR-370ESMAGNETRON REMOVALRemoval1. Disconnect the power supply cord and then removeouter case.2. Remove the oven cavity assembly from the base

29R-370EKR-370ES1. Disconnect the power supply cord, and then removeouter case.2. Open the door and block it open.3. Discharge high voltage capacitor.

30R-370EKR-370ES1. Disconnect the power supply cord, and then removeouter case.2. Open the door and block it open.3. To discharge the high voltage cap

31R-370EKR-370ESSealer filmBacking filmAdhesive tapeFigure C-5. Door DisassemblyNOTE: When carrying out any repair to the door, do notbend or warp the

32R-370EKR-370ESFigure C-9(a). Routing of 9-pin wire harnessFigure C-9(b). Routing of 9-pin wire harnessNOTE: For key unit1. Before attaching a new ke

33R-370EKR-370ES645123645123ABCDEFGHABCDEFGHFigure S-1. Pictorial DiagramHIGH VOLTAGECAPACITORHIGH VOLTAGEWIRE BH.V.RECTIFIERPOWER SUPPLY CORD 120V 60

34R-370EKR-370ES645123645123ABCDEFGHABCDEFGHFigure S-2. Power Unit CircuitN.OCOMN.OCOMB-1F-2F-3C 1C 2C 3C 4C 6C 5C 7C 9C 8+–+–+–F-1B-2T1AC(N)GNDVAINTB

35R-370EKR-370ESFigure S-3. CPU Unit CircuitC 1C 2C 3C 9C 6C 4C 5C 7G 8G 7 G 6 G 5 G 4 G 3 G 2 G 1G 9G10G11 1823764590ReheatSensorPowerLevelFreshVeget

36R-370EKR-370ESFigure S-4. Printed Wiring Board of Power UnitFCN - CCN - B1R52R50R4SP1CN - AD22D4D2(J1)R51D40C51IC2D20R2C21R1Q1D21C1S7134PD3 D1OMOMDU

37R-370EKR-370ES****∆*∆*∆∆PARTS LISTNote: The parts marked “∆” may cause undue microwave exposure.The parts marked “*” are used in voltage more than 2

2R-370EKR-370ESMICROWAVE MEASUREMENT PROCEDUREA. Requirements:1) Microwave leakage limit (Power density limit): The power density of microwave radiati

38R-370EKR-370ES∆∆∆∆*REF. NO. PART NO. DESCRIPTION Q'TY CODE4- 9 PCOVPA361WREZ Waveguide cover 1 AD4-10 LANG-A084WRFZ Separate angle A 1 AG4-11 L

39R-370EKR-370ESHOW TO ORDER REPLACEMENT PARTSTo have your order filled promptly and correctly, please furnish the following information.1. MODEL NUMB

40R-370EKR-370ES645123645123ABCDEFGHABCDEFGHOVEN AND CABINET PARTS7-41-147-177-77-77-37-74-21-74-292-37-161-64-107-67-31-107-77-71-127-14-167-54-204-1

41R-370EKR-370ES645123645123ABCDEFGHABCDEFGHDOOR PARTSMISCELLANEOUSActual wire harness may be different from illustration.(CAPACITOR)5-135-115-125-12

42R-370EKR-370ES2001 SHARP CORP. (4S2.530E) Printed in U.S.ACOPYRIGHT © 2001 BY SHARP CORPORATIONALL RIGHTS RESERVED.No part of this publication may b

3R-370EKR-370ESSHARP ELECTRONICS CORPORATIONSHARP PLAZA, MAHWAH,NEW JERSEY 07430-2135SERVICE MANUALMICROWAVE OVENR-370EK/ R-370ESFOREWORDThis Manual h

4R-370EKR-370ESITEM DESCRIPTIONPower Requirements 120 Volts / 13.5 Amperes60 HertzSingle phase, 3 wire groundedPower Output 1000 watts (IEC TEST PROCE

5R-370EKR-370EScontact a qualified electrician and have it replaced with a properlygrounded three-pronged wall receptacle or have a grounding adapterp

6R-370EKR-370ESOPERATIONDESCRIPTION OF OPERATING SEQUENCEThe following is a description of component functions duringoven operation.OFF CONDITIONClosi

7R-370EKR-370ESis cooked, water vapor is developed. The sensor “senses”the vapor and its resistance increases gradually. When theresistance reaches th