Sharp R-890SLM Service Manual

R-890SLMCONTENTSCHAPTER 1. BEFORE SERVICINGCHAPTER 2. WARNING TO SERVICE PERSONNELCHAPTER 3. PRODUCT SPECIFICATIONSCHAPTER 4. APPEARANCE VIEWCHAPTER 5

R-890SLM5 - 43. COOLING FAN OPERATIONOPERATION MODE DEVICE POWER CONTROLPREHEATCooling 60%CONV. (OVEN)Cooling fan 60% 60 min. then 100%Others Cooling

R-890SLM6 - 1CHAPTER 6. FUNCTION OF IMPORTANT COMPONENTS[1] DOOR OPEN MECHANISMThe door can be opened by pulling the door handle. When the handle is p

R-890SLM6 - 22. The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltage 1.7 KV in the voltage doubler circuit.3. D

R-890SLM7 - 1CHAPTER 7. TROUBLESHOOTING GUIDEWhen troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performin

R-890SLM7 - 2.deneposiroodehtnehwswolbA8FesuF.teltuollawotnideggulpsidrocrewopnehwswolbesufemoH.teltuollawotnideggulpsidrocrewopnehwswolbA02esuFteltuo

R-890SLM8 - 1CHAPTER 8. TEST PROCEDURES[1] A: MAGNETRON TESTNEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS

R-890SLMD2 D1ASYMMETRICRECTIFIERHIGH VOLTAGERECTIFIERA BC[3] C: HIGH VOLTAGE RECTIFIER TESTCARRY OUT 3D CHECKS.Isolate the high voltage rectifier assem

R-890SLM8 - 3[7] G: THERMAL CUT-OUT TESTCARRY OUT 3D CHECKS.Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmme

R-890SLM[12] L: GRILL HEATING ELEMENTS (TOP) AND BOTTOM HEATING ELEMENT TESTCARRY OUT 3D CHECKS.Before carrying out the following tests make sure the

R-890SLMa70PJ1SA-NC[15] O: RELAY TESTCARRY OUT 3D CHECKS.Remove the outer case and check voltage between Pin Nos. 5 and 7 of the 4 pin connect

CHAPTER 1. BEFORE SERVICINGCHAPTER 2. WARNING TO SERVICE PERSONNELCHAPTER 3. PRODUCT SPECIFICATIONS[1] SPECIFICATION ...

R-890SLM9 - 1CHAPTER 9. CONTROL PANEL ASSEMBLY[1] OUTLINE OF CONTROL PANELThe control section consists of the following units as shown in the control

R-890SLM9 - 2[2] SERVICING FOR CONTROL PANEL1. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of

R-890SLM10 - 1CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE SOLDER1. Employing lead-free solderThe “Main PWB” of this model employs lead-free solder. Th

R-890SLM11 - 1[1] BEFORE OPERATING WARNING AGAINST HIGH VOLTAGE:Microwave ovens contain circuitry capable of producing very high voltage and

R-890SLMCarefully remove four (4) screws holding the magnetron to the waveguide. When removing the screws hold the magn-etron to prevent it from fal

R-890SLMCAUTION: • Do not hit the fan blade when installing because the bracket may be deformed. • Make sure that the fan blade rotate

R-890SLM11 - 4[9] POSITIVE LOCK CONNECTOR REMOVAL1. CARRY OUT 3D CHECKS.2. Push the lever of positive lock® connector.3. Pull down on the positi

R-890SLM11 - 5[13] BOTTOM HEATING ELEMENTS REMOVAL1. CARRY OUT 3D CHECKS.2. Remove the turntable motor cover from the base plate, referring

R-890SLM11 - 62. The contacts (COM-NO) of the stop switch and the monitored latch switch open within 1.8mm gap between right side of cavity

R-890SLMCHAPTER 12. MICROWAVE MEASUREMENTAfter any repair, the microwave oven must be checked for microwave leakage to ensure continued safe operation

R-890SLMCHAPTER 1. BEFORE SERVICING[1] GENERAL IMPORTANT INFORMATIONThis Manual has been prepared to provide Sharp Corp. Service engineers with Operat

R-890SLMSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. PLUGGED IN OVEN.3. NOTHING APPEARS ON DISPLAY.CHAPTER 13. CIRCUIT DIAGRAMS[1] Oven Schematic

R-890SLM13 - 2SCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED. 2. “O” APPEARS ON DISPLAY.Figure O-1(c) Oven Schematic-OFF Condition after the oven door

R-890SLMFigure O-3(b) Oven Schematic-Grill-2 cooking Condition (BOTTOM GRILL mode)13 - 3SCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. BOTTOM GRILL

R-890SLM13 - 4Figure O-4 Oven Schematic-Convection ConditionSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. CONVECTION MODE SET.3. COOKING TIME SET.

R-890SLMFigure O-5(b) Oven Schematic-COMBI-2 cooking Condition (Microwave and Top Grill mode)SCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. COMBI 2

R-890SLM13 - 6[2] Pictorial Diagram (Figure S-1)Figure S-1. Pictorial DiagramYRGDERTHWSTNENOPMOCEGATLOVHGIHNORTENGAM.V.HROTICAPAC.V.HREIFITCERCIRTEMMY

R-890SLM[3] Control Unit Circuit13 - 7Figure S-2. Control Unit CircuitService_R-890SLM.indd 36 4/24/09 5:20:44 PM

R-890SLM[4] Printed Wiring Board of Control Unit13 - 8Service_R-890SLM.indd 37 4/24/09 5:20:50 PM

R-890SLM[5] Printed Wiring Board of Power Unit13 - 9Service_R-890SLM.indd 38 4/24/09 5:20:57 PM

R-890SLM[6] Printed Wiring Board of Switch Unit13 - 10Figure S-3. Printed Wiring Board of Switch UnitService_R-890SLM.indd 39 4/24/09 5:21:02 PM

R-890SLMCHAPTER 2. WARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of producing very high voltage and current, contact with any

R-890SLM13 - 9Service_R-890SLM.indd 40 4/24/09 5:21:04 PM

R-890SLMCONTENTS PARTS LIST MICROWAVE OVEN WITHGRILL AND CONVECTIONMODELS R-890SLMParts marked “*” may cause undue microwave exposure.Par

R-890SLM2[1] OVEN PARTS7-67-187-117-167-87-187-7x7x2x21-184-254-364-144-264-304-324-274-324-197-127-137-94-31-84-214-247-187-187-187-184-287-42-37-47-

R-890SLMPARTS LIST3 NO. PARTS CODEDESCRIPTIONQ’TY PRICERANK [1] OVEN PARTS ELECTRIC PARTS 1-1 FH-HZA075WRE0 Thermistor 1 AS 1-2

R-890SLM4 NO. PARTS CODE DESCRIPTIONQ’TY PRICERANK 4-19 NFANMA001URP0 Convection fan 1 AF 4-20 PSPAGA001WRE0 Vibration proof cus

R-890SLM5[2] DOOR AND CONTROL PANEL PARTS3-53-23-123-113-83-73-103-93-33-63-45-35-45-15-65-75-55-2-65-2-45-2-15-2-555-2x65-95-2-33-113-11 x103-15-85-2

R-890SLM6 NO. PARTS CODE DESCRIPTIONQ’TY PRICERANK [2] DOOR AND CONTROL PANEL PARTS CONTROL PANEL PARTS 3-1 DPWB-A725DRKZ Control unit

COPYRIGHT© 2008 BY SHARP CORPORATIONALL RIGHTS RESERVED.No part of this publication may be reproduced, stored in retrieval systems, or transmit

R-890SLMCHAPTER 3. PRODUCT SPECIFICATIONS[1] SPECIFICATIONITEM DESCRIPTIONPower Requirements 230 - 240 Volts / 50 Hertz / Single phase, 3 wire earthed

R-890SLMHELP13245116461726735789101211131514CHAPTER 4. APPEARANCE VIEW[1] OVEN1. Control panel2. Oven lamp3. Waveguide cover4. Bottom Grill he

R-890SLM[1] OFF CONDITIONClosing the door activates the monitored latch switch and the stop switch.IMPORTANTWhen the oven door is closed, the cont

R-890SLM5 - 2[3] GRILL COOKING CONDITION1. TOP GRILL (Figure O-3)In this condition the food is cooked by the top grill heating element. Pre

R-890SLM5 - 33. MICROWAVE AND BOTTOM GRILL (Figure O-5c)Press MIX button 3 times. And enter the desired cooking time by rotating the ENCODER d