Sharp R-890SLM Service Manual
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Sharp R-890SLM Service Manual

Microwave oven with grill and convection
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See also: Operation Manual With Cookbook
CHAPTER 1. BEFORE SERVICING
CHAPTER 2. WARNING TO SERVICE PERSONNEL
CHAPTER 3. PRODUCT SPECIFICATIONS
CHAPTER 4. APPEARANCE VIEW
CHAPTER 5. OPERATION SEQUENCE
CHAPTER 6. FUNCTION OF IMPORTANT
COMPONENTS
CHAPTER 7. TROUBLESHOOTING GUIDE
CHAPTER 8. TEST PROCEDURES
Service_R-890SLM.indd 1
SERVICE MANUAL
MICROWAVE OVEN WITH
GRILL AND CONVECTION
MODELS
In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.
CONTENTS
CHAPTER 9. CONTROL PANEL ASSEMBLY
CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE
SOLDER
CHAPTER 11. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
CHAPTER 12. MICROWAVE MEASUREMENT
CHAPTER 13. CIRCUIT DIAGRAMS
Parts List
This document has been published to be used for after sales service only.
The contents are subject to change without notice.
S3905R890PKS
R-890SLM
R-890SLM
4/25/09 10:54:28 AM

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  • Page 1 R-890SLM SERVICE MANUAL S3905R890PKS MICROWAVE OVEN WITH GRILL AND CONVECTION R-890SLM MODELS In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. CONTENTS CHAPTER 1. BEFORE SERVICING CHAPTER 9.

  • Page 2: Table Of Contents

    CONTENTS CHAPTER 1. BEFORE SERVICING [15] O: RELAY TEST ..........8-5 [16] P: PROCEDURES TO BE TAKEN CHAPTER 2. WARNING TO SERVICE PERSONNEL WHEN THE FOIL PATTERN ON THE CHAPTER 3. PRODUCT SPECIFICATIONS PRINTED WIRING BOARD (PWB) IS SPECIFICATION .........3-1 OPEN ............8-5 CHAPTER 4.

  • Page 3: Chapter 1. Before Servicing

    [1] GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service.

  • Page 4: Chapter 2. Warning To Service Personnel

    3D checks and re-examine the connections to the component being tested. Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may, in some cases, be necessary to connect the supply after the outer...

  • Page 5: Chapter 3. Product Specifications Specification

    R-890SLM CHAPTER 3. PRODUCT SPECIFICATIONS [1] SPECIFICATION ITEM DESCRIPTION Power Requirements 230 - 240 Volts / 50 Hertz / Single phase, 3 wire earthed Microwave cooking 1.50 kW Approx. 6.5A Convection cooking 1.91 kW Approx. 8.0 A Top Grill mode ---------------------- 1.25kW Approx. 5.2A...

  • Page 6: Chapter 4. Appearance View

    R-890SLM CHAPTER 4. APPEARANCE VIEW [1] OVEN 1. Control panel 2. Oven lamp 3. Waveguide cover 10 11 4. Bottom Grill heating element 5. Turntable motor shaft 6. Oven cavity 7. Door seals and sealing surfaces 8. Door latches 9. Door opening handle 10.

  • Page 7: Chapter 5. Operation Sequence Off Condition

    R-890SLM CHAPTER 5. OPERATION SEQUENCE [1] OFF CONDITION CONDITION DURING DOOR OPEN SWITCH CONTACT Closing the door activates the monitored latch switch and the COOKING (NO COOKING) stop switch. Monitored latch COM-NO Closed Opened switch COM-NC Opened Closed IMPORTANT Stop switch...

  • Page 8: Grill Cooking Condition

    R-890SLM [3] GRILL COOKING CONDITION 1. TOP GRILL (Figure O-3) 2. CONVECTION COOKING (Figure O-4) When the pre-heat temperature is reached, a beep signal will In this condition the food is cooked by the top grill heating sound indicating that the holding the temperature has been element.

  • Page 9: On/Off Time Ratio

    R-890SLM 3. MICROWAVE AND BOTTOM GRILL (Figure O-5c) [6] ON/OFF TIME RATIO Press MIX button 3 times. And enter the desired cooking time In grill cooking, convection cooking or combi cooking, the top by rotating the ENCODER dial. And press MICRO POWER heater, bottom heater or magnetron operate within a 54 second button to set the desired microwave power.
  • Page 10 R-890SLM 3. COOLING FAN OPERATION OPERATION MODE DEVICE POWER CONTROL PREHEAT Cooling CONV. (OVEN) Cooling fan 60% 60 min. then 100% Others Cooling fan 100% A cooling fan continues the rotation when Oven temperature is more than 120°C. Cooling fan Then, it stops when it is less than 105°C...

  • Page 11: Chapter 6. Function Of Important Com

    R-890SLM CHAPTER 6. FUNCTION OF IMPORTANT COMPONENTS [1] DOOR OPEN MECHANISM The door can be opened by pulling the door handle. When the CAUTION: BEFORE REPLACING A BLOWN FUSE F8A, handle is pulled, the latch head is pulled, the latch head is moved...

  • Page 12: Noise Filter

    R-890SLM rised above 120°C, the fan motor remains rotating. Automatically the fan motor will be shut down at low temperature (less than 2. The peak reverse voltage of D2 of the rectifier goes beyond 105°C). the rated peak reverse voltage 1.7 KV in the voltage doubler circuit.

  • Page 13: Chapter 7. Troubleshooting Guide

    R-890SLM CHAPTER 7. TROUBLESHOOTING GUIDE When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the “Test Procedure”...
  • Page 14 R-890SLM BLOCKED COOLING FAN BLOCKED CONVECTION FAN NO POWER AT WALL OUTLET HOME FUSE OR BREAKER MIS-ADJUSTMENT OF SWITCHES BLOCKED VENTILATION OPENINGS OPENED WIRE HARNESS SHORTED WIRE HARNESS OVEN LAMP POWER SUPPLY CORD FOIL PATTERN ON P.W.B. RELAY RY7 RELAY RY6...

  • Page 15: Chapter 8. Test Procedures A: Magnetron Test

    This oven should be tested for microwave leakage on completion of any repair or adjustment, following the procedure described in the Sharp Technical Training notes (part number SERV-LITMW01). The maximum leakage permitted in BS EN 60335-2-25 is 50W/m (equivalent to 5W/m ), however it is not normal to detect any significant leakage, therefore, any leakage which is detected should be...

  • Page 16: C: High Voltage Rectifier Test

    R-890SLM [3] C: HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS. Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading.

  • Page 17: G: Thermal Cut-Out Test

    R-890SLM [7] G: THERMAL CUT-OUT TEST CARRY OUT 3D CHECKS. Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a continuity test across the two terminals as described in the below. Table: Thermal Cut-out Test Temperature of “ON”...

  • Page 18: L: Grill Heating Elements (Top) And Bottom Heating Element Test

    R-890SLM [12] L: GRILL HEATING ELEMENTS (TOP) AND BOTTOM HEATING ELEMENT TEST CARRY OUT 3D CHECKS. Before carrying out the following tests make sure the heating element is cool completely. 1. Resistance of heater. Disconnect the wire leads to the heating element to be tested. Using ohmmeter with low resistance range. Check the resistance across the terminals of the heating element as described in the following table.

  • Page 19: O: Relay Test

    R-890SLM CARRY OUT 4R CHECKS. SW11 SHORT CUTS SW13 SW15 KITCHEN TIMER & / CLOCK SET SW14 SW10 SW12 [15] O: RELAY TEST CARRY OUT 3D CHECKS. Remove the outer case and check voltage between Pin Nos. 5 and 7 of the 4 pin connector (E) on the control unit with an A.C.

  • Page 20: Chapter 9. Control Panel Assembly

    R-890SLM CHAPTER 9. CONTROL PANEL ASSEMBLY [1] OUTLINE OF CONTROL PANEL 4) Reset Circuit The control section consists of the following units as shown in the control panel circuit. A circuit to generate a signal which resets the LSI to the initial state when power is supplied.

  • Page 21: Servicing For Control Panel

    R-890SLM [2] SERVICING FOR CONTROL PANEL 1. Precautions for Handling Electronic Components b) On some models, the power supply cord between the This unit uses CMOS LSI in the integral part of the circuits. control panel and the oven is long enough that they When handling these parts, the following precautions should may be separated from each other.

  • Page 22: Chapter 10. Precautions For Using Lead-Free Solder

    R-890SLM CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder The “Main PWB” of this model employs lead-free solder. This is indicated by the “LF” symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder.

  • Page 23: Chapter 11. Component Replacement And

    R-890SLM CHAPTER 11. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE [1] BEFORE OPERATING WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, High Voltage Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..

  • Page 24: High Voltage Components Removal

    R-890SLM [3] HIGH VOLTAGE COMPONENTS REMOVAL (HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY) To remove the components, proceed as follows. CARRY OUT 3D CHECKS. Disconnect the high voltage rectifier assembly from the high voltage capacitor. Disconnect the filament lead of the high voltage transformer and the high voltage wire A from the high voltage capacitor.

  • Page 25: Turntable Motor Replacement

    Figure C-1(a). CAUTION: DO NOT DROP THE TURNTABLE MOTOR COVER 1. Remove the any sharp edges on the turntable motor cover INTO THE OVEN AFTER CUTTING THE BRIDGES. and the base plate with the cutting pliers.

  • Page 26: Positive Lock Connector Removal

    R-890SLM [9] POSITIVE LOCK CONNECTOR REMOVAL Terminal 1. CARRY OUT 3D CHECKS. Positive lock¨ ® 2. Push the lever of positive lock connector. connector 3. Pull down on the positive lock ® connector. Push Figure C-2. Positive lock ® connector ®...

  • Page 27: Bottom Heating Elements Removal

    R-890SLM [13] BOTTOM HEATING ELEMENTS REMOVAL 1. CARRY OUT 3D CHECKS. 5. Remove the heater cover and the heater packing from the bottom heating element. 2. Remove the turntable motor cover from the base plate, referring to “TURNTABLE MOTOR REPLACEMENT”.

  • Page 28: Door Replacement

    R-890SLM 2. The contacts (COM-NO) of the stop switch and the 4. When the door is closed the contacts (COM-NC) of the monitored latch switch open within 1.8mm gap between right monitor switch and monitored latch switch open. And the side of cavity face plate and door when door is opened.

  • Page 29: Chapter 12. Microwave Measurement

    R-890SLM CHAPTER 12. MICROWAVE MEASUREMENT After any repair, the microwave oven must be checked for microwave leakage to ensure continued safe operation. BS EN 60335-2-25 specifies that the maximum permitted leakage with a load of 275 ml is 50 W/m...

  • Page 30: Chapter 13. Circuit Diagrams

    R-890SLM CHAPTER 13. CIRCUIT DIAGRAMS [1] Oven Schematic SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. PLUGGED IN OVEN. 3. NOTHING APPEARS ON DISPLAY. Figure O-1(a) Oven Schematic-OFF Condition right after the oven is plugged in. SCHEMATIC NOTE: CONDITION OF OVEN 1.
  • Page 31 R-890SLM SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. “O” APPEARS ON DISPLAY. Figure O-1(c) Oven Schematic-OFF Condition after the oven door is closed. SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. MICROWAVE MODE SET. 3. COOKING TIME SET.
  • Page 32 R-890SLM SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. BOTTOM GRILL MODE SET. 3. COOKING TIME SET. 4. START BUTTON PRESSED. Figure O-3(b) Oven Schematic-Grill-2 cooking Condition (BOTTOM GRILL mode) SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. TOP & BOTTOM GRILL MODE SET.
  • Page 33 R-890SLM SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CONVECTION MODE SET. 3. COOKING TIME SET. 4. CONVECTION TEMPERATURE SELECTED. 5. START BUTTON PRESSED. NOTE: The top heating element, bottom heating element, fan motor and convection motor will be turned on and off according to the temperature.
  • Page 34 R-890SLM SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. COMBI 2 MODE SET. 3. COOKING TIME SET. 4. MICROWAVE POWER LEVEL SET. 5. START BUTTON PRESSED. Figure O-5(b) Oven Schematic-COMBI-2 cooking Condition (Microwave and Top Grill mode) SCHEMATIC NOTE: CONDITION OF OVEN 1.

  • Page 35: Pictorial Diagram (Figure S-1)

    R-890SLM [2] Pictorial Diagram (Figure S-1) CN-A CN-E CN-B CN-C Figure S-1. Pictorial Diagram 13 - 6 Service_R-890SLM.indd 35 4/25/09 10:57:00 AM...

  • Page 36: Control Unit Circuit

    R-890SLM [3] Control Unit Circuit Figure S-2. Control Unit Circuit 13 - 7 Service_R-890SLM.indd 36 4/24/09 5:20:44 PM...

  • Page 37: Printed Wiring Board Of Control Unit

    R-890SLM [4] Printed Wiring Board of Control Unit 13 - 8 Service_R-890SLM.indd 37 4/24/09 5:20:50 PM...

  • Page 38: Printed Wiring Board Of Power Unit

    R-890SLM [5] Printed Wiring Board of Power Unit 13 - 9 Service_R-890SLM.indd 38 4/24/09 5:20:57 PM...

  • Page 39: Printed Wiring Board Of Switch Unit

    R-890SLM [6] Printed Wiring Board of Switch Unit Figure S-3. Printed Wiring Board of Switch Unit 13 - 10 Service_R-890SLM.indd 39 4/24/09 5:21:02 PM...
  • Page 40 R-890SLM 13 - 9 Service_R-890SLM.indd 40 4/24/09 5:21:04 PM...

  • Page 41: Parts List

    R-890SLM PARTS LIST MICROWAVE OVEN WITH GRILL AND CONVECTION HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly, please R-890SLM furnish the following information. MODELS 1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION Parts marked “*”...
  • Page 42 R-890SLM [1] OVEN PARTS 7-18 7-18 7-18 4-21 4-24 7-18 7-11 4-28 4-26 4-25 4-30 4-36 7-18 7-16 7-15 4-32 4-14 4-34 7-18 4-33 7-12 4-18 7-13 7-17 4-19 1-12 7-15 4-32 1-11 1-18 4-37 7-18 4-27 7-18 7-21 1-10...
  • Page 43 R-890SLM PARTS LIST PRICE PARTS CODE DESCRIPTION Q’TY RANK [1] OVEN PARTS ELECTRIC PARTS FH-HZA075WRE0 Thermistor RTRN-A529WRE1 TC transformer RTRN-A529WRE0 TC transformer (Interchangeable) QACCBA004URE5 Power supply cord FH-DZA135WRZZ High voltage rectifier assembly FH-DZA035WRE1 High voltage rectifier assembly (Interchangeable) FPWBFA309WRE4 Noise filter (including fuse F8A)
  • Page 44 R-890SLM PRICE PARTS CODE DESCRIPTION Q’TY RANK 4-19 NFANMA001URP0 Convection fan 4-20 PSPAGA001WRE0 Vibration proof cushion 4-21 PCUSUA006URE0 Air cushion B 4-22 PCOVQA002URP1 Heater cover 4-23 PCOVPA308WRE1 Waveguide cover 4-24 PCUSUA015URE0 Back plate cushion 4-25 PPIP-A001UR10 Pipe 4-26 PCOVQA001URP1 Rear heat cover...
  • Page 45 R-890SLM [2] DOOR AND CONTROL PANEL PARTS 5-2-1 5-2-8 5-2-6 5-2-4 5-2-5 5-2-3 3-11 3-11 3-12 3-11 x10 3-10 Service_R-890SLM.indd 45 4/24/09 5:21:35 PM...
  • Page 46 R-890SLM PRICE PARTS CODE DESCRIPTION Q’TY RANK [2] DOOR AND CONTROL PANEL PARTS CONTROL PANEL PARTS DPWB-A725DRKZ Control unit DPWB-A715DRKZ Switch unit FBTN-A209WRKZ Push button assy HPNLCC224WRRZ Control panel HDECQA417WRT Panel cap upper HDECQA419WRTZ Panel cap lower GMADIA211WRRZ Display window...
  • Page 47 COPYRIGHT© 2008 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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